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Scooters - 125 to 300 => Downtown 300 => Topic started by: roxyflash on March 21, 2019, 12:04:41 AM

Title: What plug are you using
Post by: roxyflash on March 21, 2019, 12:04:41 AM
I bought the iridium NGK junk wont waste my money on them I hate NGK plugs then foul to easy same with my dirt bike I think im going to try denso
Title: Re: What plug are you using
Post by: CROSSBOLT on March 21, 2019, 01:40:33 AM
That's odd, since the NGK iridium I had in my first DT 300i worked fine for 15000 miles. Denso has always been a good product in my experience but their plugs will foul if the heat range is wrong or if the ignition system is having a problem. Maybe you have not analyzed your problem properly before you bad-mouth a component NO ONE has had a problem with to date.
Title: Re: What plug are you using
Post by: kneeslider on March 21, 2019, 03:55:10 AM
I have used NGK CR7E for about 70000kms, the past 14000kms were on NGK CR8E.
Title: Re: What plug are you using
Post by: ccemn1 on March 21, 2019, 02:36:51 PM
I'm trying to find an iridium plug for my Kymco X-Town 300 i, but can't seem to find one anywhere online.
Does anyone have a clue if these is an iridium plug available for this model?
Title: Re: What plug are you using
Post by: stuo on March 21, 2019, 09:40:36 PM
Plug fouling is a symptom of something not right: wrong heat plug, incorrect plug gap, weak spark, broken piston ring, worn cylinder, etc. It has nothing to do with the brand of spark plug. It would be the same faulty logic as blaming the brand of oil for excessive oil consumption.
Title: Re: What plug are you using
Post by: Stig / Major Tom on March 21, 2019, 11:40:04 PM
I'm trying to find an iridium plug for my Kymco X-Town 300 i, but can't seem to find one anywhere online.
Does anyone have a clue if these is an iridium plug available for this model?
There will be an Iridium alternative listed of the regular plug.....IF there indeed IS an Iridium substitute.
Not every plug has an Iridium version, in my experience.
Use only the proper crossover Iridium plug....of exactly the same heat range. (This info is directly from NGK.....do NOT  change the heat range from orig. plug!
"But Iridiums are hotter, so i need to change heat range...." NGK says this is not true.
Just bought 4 new Denso Iridiums  (in red Toyota box) for my Scion...OEM in that car.
Stig
Title: Re: What plug are you using
Post by: kneeslider on March 22, 2019, 02:33:15 AM
First of all, one must ask themselves why they wish to go with an Iridium plug on a scooter's motor.

To be frank, the engine on these things are's exactly the state of the art. They are kinda basic, air, fuel, spark with some electronics added in. They do not need Iridium plugs, hell! even direct injected turbo charged engines do not have iridium plugs from factory.

So in the world of marketing hype, manufacturers claim that an iridium plug produced more power out of the motor, with everything the same with say an AFR of 1:14, the Iridium plug will not provide more power.

Marketing tactics will claim that with dyno charts the power hike, but please bear in mind, any new plug replacing a worn plug will provide more power out of the engine regardless if its an iridium or copper plug.

The only advantage which I can think of for using an iridium plug for scooters is that their service life is longer. But I personally would prefer to have a fresh copper plug every 10,000km than having one iridium plug running for 40,000kms.
Title: Re: What plug are you using
Post by: scooterfan on March 22, 2019, 08:29:17 AM

First of all, one must ask themselves why they wish to go with an Iridium plug on a scooter's motor.



Easy question to answer.

Firstly - when any given spark plug gets worn, the spark plug loses efficiency, the fuel does not burn properly, unburnt fuel start passing the piston rings, an the unburnt fuel ends up polluting and thinning the engine oil. This obviously means more wear on engine components will start taking place - simply because the spark plug is worn.
Now who on earth would like that - even on a state of art scooter engine ?

Secondly - when any given spark plug start losing efficiency, the engine obviously start losing efficiency as well. That's when it becomes "normal" to open the throttle - when owners try to "force" more power from the engine.
In real life, opening the throttle more than usual only means more unburnt fuel will end up inside the oil sump, and wear on the engine will start taking place even faster.

Thirdly -  iridium spark plugs are not that expensive, and will easily outlast the lifespan of most scooter engines. Even on smaller scooters it makes absolute sense to install iridium plugs - simply due to reasons mentioned above.

I like fiddling on mechanical things, but simply fail to find any good reason why iridium plugs should NOT be used on any of these scooters.  Specially on more expensive scooter models where owners prefer to keep scooters for a long period, I think it makes absolute financial sense to install iridium plugs on their scooters.
After all - who in his/her right mind would like to remove those panels on more expensive scooters just to replace a spark plug ?

Just my 2 cents.
Title: Re: What plug are you using
Post by: kneeslider on March 22, 2019, 09:50:10 AM
mmmmmm, I should give it a try and see how it performs.
Title: Re: What plug are you using
Post by: roxyflash on March 25, 2019, 12:16:42 AM
Ok here’s the deal scooter has less then 2000 miles bought it last year used with 1600 miles it was hard starting after warmed up did the vent cap trick then set valves put new iridium plug which it had been already changed same plug dought it had iridium in it new.Plug was really brown not tan.So finished last summer ran good.Took scooter out this spring wouldn’t fire.Had a copper plus plug new tried it sometimes I get spark sometimes it wouldn’t this is with plug out.Bad thing about doing this is it floods the engine with fuel.So I pulled the injector out of the head so it would fill the cylinder full of fuel I get plenty of fuel so it’s a spark issue.So I have two iridium one used one new and new copper plug finally after a hour of fooling with it I had it running with check engine light on never was on last year.The plug that ran was the used iridium I had a 37 code I believe which is bad ignition coil but I had it unplugged checking for voltage at coil so it warmed up I tried to reset the engine light but flooded it again messing with throttle for reset.So I ordered a new coil figuring I had issues with starting it last summer and that it had a new plug installed earlier.After reading all about plugs my conclusion is it takes a high energy spark to correctly use the iridium plug the best plug for low energy setup is a copper plus plug.Where I work we have lots of small Kubuta engines gas there constantly fouling plugs taking out the coil packs when they miss fire always have NGK plugs.They buy cheap autolite plugs have better performance out of those compare to NGK.So when new coil gets here going to do more testing I’m not sold on the iridium in these small motors I believe I paid almost 9 dollars for it.I don’t drive a lot so I would never wear out a iridium plug my thinking is if a copper plug is more suited for a lower energy spark that’s the route to go plus I can change it yearly and be cost effective.
Title: Re: What plug are you using
Post by: scooterfan on March 25, 2019, 06:23:45 AM
................................................So finished last summer ran good.Took scooter out this spring wouldn’t fire.Had a copper plus plug new tried it sometimes I get spark sometimes it wouldn’t this is with plug out........................................After reading all about plugs my conclusion is it takes a high energy spark to correctly use the iridium plug the best plug for low energy setup is a copper plus plug.................................................I don’t drive a lot so I would never wear out a iridium plug my thinking is if a copper plug is more suited for a lower energy spark that’s the route to go plus I can change it yearly and be cost effective.


You mentioned that you checked battery voltage - but you actually need to check voltage when you hit the starter button and the engine start swinging.
Your scooter probably has a DC CDI, which needs at least more than 9 Volts to supply sufficient power to the spark plug for a proper spark. There are comments from other members at this forum who has experienced this and confirmed this.

You mentioned this problem only started when you took the scooter out just after winter - during spring. No spark plug dies by itself during winter - batteries on it's way out usually do. So I think chances are good that you are sitting with a dying battery, the spark plug is most probably still in perfect condition.

Iridium spark plugs actually needs less voltage to provide a proper spark , an ordinary spark plug needs more voltage.

Long story - but just do a Voltage test on the battery when you hit the starter button. If you get a reading of just over 9 Volts or lower -  the problem is at your battery, not at the spark plug. You actually need to get a proper load test done on the battery to find out whether the battery is still good.
Also check your battery terminals for corrosion, or loose connections.









Title: Re: What plug are you using
Post by: CROSSBOLT on March 25, 2019, 11:43:10 AM
Scooterfan, you are spot on! My hassle with the battery last year showed 9.5 volts during cranking  but would not start the engine but I am not gonna quibble over .5 volts! Roxy, I think you may have "rushed" to a conclusion, something we all have done and try to avoid. Test your battery volts like scooterfan recommended and post back, please.
Title: Re: What plug are you using
Post by: stuo on March 25, 2019, 07:10:18 PM
My 2 cents worth:

I studied to be an electrical engineer, built my own ham radio station and many other electronic devices. I've been wrenching on cars and bikes for 60+ years. I admit ignorance of modern EFI systems but spark plugs haven't changed in 100 years, other than better, longer lasting tips on the center element.

My opinion is that the only advantage to an iridium (or platinum) plug is the longevity. Iridium and platinum tipped plugs are highly heat resistant so the tip doesn't burn away as fast as on copper tipped plugs. On copper tipped plugs you either have to adjust the gap or replace the plug more often.

A spark plug does one thing: it provides a gap for the voltage from the coil to jump across. The spark either jumps the gap or it doesn't. If it does, the gas/air mixture fires, if not, it doesn't fire. If you put a lit match to gasoline, or a blow torch to gasoline, it will ignite and burn exactly the same in either case. The "intensity" of the spark does not make a difference to a gas/air mixture: it fires (burns) or it doesn't.

I also believe in the placebo effect: If you believe iridium plugs make your engine run better then they are worth the extra moola. Plus you don't have to change, or adjust them, as often.
Title: Re: What plug are you using
Post by: roxyflash on March 26, 2019, 01:12:51 AM

You mentioned that you checked battery voltage - but you actually need to check voltage when you hit the starter button and the engine start swinging.
Your scooter probably has a DC CDI, which needs at least more than 9 Volts to supply sufficient power to the spark plug for a proper spark. There are comments from other members at this forum who has experienced this and confirmed this.

You mentioned this problem only started when you took the scooter out just after winter - during spring. No spark plug dies by itself during winter - batteries on it's way out usually do. So I think chances are good that you are sitting with a dying battery, the spark plug is most probably still in perfect condition.

Iridium spark plugs actually needs less voltage to provide a proper spark , an ordinary spark plug needs more voltage.

Long story - but just do a Voltage test on the battery when you hit the starter button. If you get a reading of just over 9 Volts or lower -  the problem is at your battery, not at the spark plug. You actually need to get a proper load test done on the battery to find out whether the battery is still good.
Also check your battery terminals for corrosion, or loose connections.
Ok battery new when bought scooter February 2018 always been on a moose charger never been discharged.Your wrong about iridium plugs.The articles I read tru state there’s plugs for different applications .Like my old truck they don’t recommend iridium but just copper plug.I used a group 31 battery when I was testing for spark.Brand new charged.Like I stated this scooter acted up last summer when I didn’t want to start acted like there was no spark.The only other thing is it’s possible the starter could be drawing to many amps but doesn’t act like that.When it acted up last year I cranked on it then let it sit for a minute then tried it again battery was getting low the battery light would come on then it would start.I did this like a half dozen times.I then did the vent on gas cap and set valves but weather changed from 90degree to 80s.probably why it’s a 2012 with low miles nothing but trouble starting so they traded it off like I said there’s got to been issues with spark being it had plugs that have been changed before I bought it and there’s not many miles on it.I had a cheap Tao Tao 50 scooter same mileage and never changed a plug even after putting a 77 cc kit on it.The worst thing about the downtown doesn’t have a kick starter and has a very small battery with lights on trying to start it.Hopefully I get this figured out but so far my old Tao Tao was more reliable always started.I believe I got someone else’s headache mow it’s mine
Title: Re: What plug are you using
Post by: stuo on March 26, 2019, 01:27:05 AM
The distance from the center electrode to the ground (bent) electrode of a spark plug determines the amount of voltage needed to jump the gap, nothing else matters, except to a negligible degree the conductivity of the fuel/air mixture. Iridium, platinum and copper plugs are equal in their ability to ignite the fuel/air mixture.

I don't understand where all this mis-information about spark plugs comes from. I know in the 80's there was a lot of snake oil claims about various types of "new revolutionary spark plug design", which died away when the claims fell flat. I dare anyone to find one valid study that shows one spark plug to be superior to another.
Title: Re: What plug are you using
Post by: CROSSBOLT on March 26, 2019, 04:12:04 AM
Well, Roxy, I really do not have any idea why your 2012 DT300i is a problem starting. Yours seems to be the only one in many here with that problem. It could be still a number of causes like a bad or intermittent pulsar, a simple bad ground somewhere, I don't know. But I could find the problem within a week with a logical trouble shooting approach. And that would be an easy week at that.
Title: Re: What plug are you using
Post by: scooterfan on March 26, 2019, 06:44:18 AM
Ok battery new when bought scooter February 2018 always been on a moose charger never been discharged...............................
The only other thing is it’s possible the starter could be drawing to many amps but doesn’t act like that..........................

Hopefully I get this figured out but so far my old Tao Tao was more reliable always started.I believe I got someone else’s headache mow it’s mine



Good luck in finding the problem. Nobody can obviously force you to do a proper Volt test, I can only mention that to my experience there is no guarantee that a brand new battery can not be faulty. In fact - as recent as early last year a brand new battery on my previous bike has been replaced under guarantee, because the new battery I bought a couple of months before got faulty.

I would also recommend doing a Google search about how DC CDI's actually work. Only when one realize these things need maximum power from the BATTERY to produce a powerful spark at the plug, it becomes easier to understand why scooters battle to start with lower Volts from the battery.

Your scooter also has a fuel pump, which obviously draws more power from the battery. Apart from the starter motor, the fuel pump obviously contributes to a deeper power surge from the battery. This additional power surge can also contributes insufficient Voltage at the CDI to produce a proper spark at the spark plug.

Anyway - should you ever decide to do a proper Voltage test during your lifetime, you should actually unplug the power supply plug on your scooter's CDI.
DC CDI's normally has 6 pins, and the power supply plug is often a seperate 2 pin plug which plug in to 2 of the 6 pins on the CDI. The Voltage test should be done on the Positive (+) terminal of the loose wire when the plug has been unplugged from the CDI.
You just need to switch the ignition switch on, press the starter button, and see what Voltage reading you get at the terminal when the engine is swinging.

Again, nobody can force you to do the Voltage test at the CDI plug. I certainly would do the test - even on a "new" battery.

Good luck.







Title: Re: What plug are you using
Post by: roxyflash on March 28, 2019, 01:44:35 AM

Good luck in finding the problem. Nobody can obviously force you to do a proper Volt test, I can only mention that to my experience there is no guarantee that a brand new battery can not be faulty. In fact - as recent as early last year a brand new battery on my previous bike has been replaced under guarantee, because the new battery I bought a couple of months before got faulty.

I would also recommend doing a Google search about how DC CDI's actually work. Only when one realize these things need maximum power from the BATTERY to produce a powerful spark at the plug, it becomes easier to understand why scooters battle to start with lower Volts from the battery.

Your scooter also has a fuel pump, which obviously draws more power from the battery. Apart from the starter motor, the fuel pump obviously contributes to a deeper power surge from the battery. This additional power surge can also contributes insufficient Voltage at the CDI to produce a proper spark at the spark plug.

Anyway - should you ever decide to do a proper Voltage test during your lifetime, you should actually unplug the power supply plug on your scooter's CDI.
DC CDI's normally has 6 pins, and the power supply plug is often a seperate 2 pin plug which plug in to 2 of the 6 pins on the CDI. The Voltage test should be done on the Positive (+) terminal of the loose wire when the plug has been unplugged from the CDI.
You just need to switch the ignition switch on, press the starter button, and see what Voltage reading you get at the terminal when the engine is swinging.

Again, nobody can force you to do the Voltage test at the CDI plug. I certainly would do the test - even on a "new" battery.

Good luck.
You don’t get it had my fluke at the coil testing voltage with a new car battery group 31 getting plenty voltage at coil!Back probe it then when it run had the 37 code.Im done here.Im aerial technician been doing it for 25 years.You think I’m stupid or something just read what I posted.I wasn’t even using the scooter battery.The group 31 has 950 cold cracking amps I don’t have a low volt issue from battery
Title: Re: What plug are you using
Post by: scooterfan on March 28, 2019, 07:00:33 AM
You don’t get it had my fluke at the coil testing voltage with a new car battery group 31 getting plenty voltage at coil!Back probe it then when it run had the 37 code.Im done here.Im aerial technician been doing it for 25 years.You think I’m stupid or something just read what I posted.I wasn’t even using the scooter battery.The group 31 has 950 cold cracking amps I don’t have a low volt issue from battery


Thanks for more detail about code 31 batteries. Unfortunately we don't use the term "code 31" batteries at this side of the pond, and I didn't Google the subject before I passed my comments. Over here we just refer to "Amp Hours", or the number stamped on batteries  when we refer to specific size batteries. I just Googled "code 31" batteries" now, and now understand what you were referring to. My fault.

As far as Iridium spark plugs are concerned - I don't understand for what reason you informed me "you are wrong". At more than 250 000 kms my wife's car (Ford Focus 2 liter Trend) is still running perfectly with it's second set of Iridium plugs. We bought the car new, and I replaced the original set of plugs myself at about 155 000 kms. I recently inspected the second set of plugs, and couldn't find any reason why the plugs needed to be replaced.
I bought my previous bike (Honda NC700X) brand new, and sold the bike at 87 000 kms without ever changing the original plugs. I kept record of fuel consumption from day one, and at 87k fuel consumption was exactly the same as when thje bike was new. I once inspected the plugs, and it still looked brand new.

There are people at this forum who use Iridium plugs on their engines without any problems. I can not think of any reason why they do not experience problems with Iridium plugs on their engines, and you think Iridium plugs would not be good for these engines. To my mind it simply doesn't make sense. Your 25 years of areal technician experience will not convince me that my own personal experiences with iridium plugs are wrong. To my mind more owners need to come forward with Iridium plug problems on their scooters, otherwise I will not believe I am wrong about Iridium spark plugs.

I must admit, i completely forgot that your scooter does not have a separate CDI. Your scooter is a fuel injected model, and the CDI is integrated with the ECU unit. Therefore my comments hoe a Volt test should be done is not applicable on your scooter.

Anyway, I hope you will find the problem, and tell us what actually caused the problem. My intention is to buy a scooter like yours somewhere in future, and I would really appreciate as much technical information possible.

No bad feelings - good luck.




Title: Re: What plug are you using
Post by: ccemn1 on April 03, 2019, 07:47:13 PM
The distance from the center electrode to the ground (bent) electrode of a spark plug determines the amount of voltage needed to jump the gap, nothing else matters, except to a negligible degree the conductivity of the fuel/air mixture. Iridium, platinum and copper plugs are equal in their ability to ignite the fuel/air mixture.

I don't understand where all this mis-information about spark plugs comes from. I know in the 80's there was a lot of snake oil claims about various types of "new revolutionary spark plug design", which died away when the claims fell flat. I dare anyone to find one valid study that shows one spark plug to be superior to another.
I had iridium plugs in a Nissan truck I just sold for 178,000 miles without a hiccup.
They won't make more HP, or make a poorly tuned, or damaged motor run any better, but because they don't wear and act like a cold plug when hot, and a hot plug when cold, you will get good running longevity out of them you won't believe.
Then again, you can still drink out of wooden cups, or antler horns if you like too.
Title: Re: What plug are you using
Post by: roxyflash on April 07, 2019, 01:24:05 PM
Platinum and iridium perform at a lower level then copper because they are less conductive then copper and they tend to overheat.However there longevity is better then copper in reality the copper has best performance with worst longevity that being said with a lower spark will fire better then the fancier long lasting plug.I my self don’t believe these scooters have a high out put coil.
Title: Re: What plug are you using
Post by: roxyflash on April 09, 2019, 12:21:25 AM
Finally got the coil today installed it with the copper plug hit the start button popped right off.The check engine light was still on try to reset it didn’t do it right the first time try it again wouldn’t go off.Took it for a ride stopped on the side off road did the reset again it cleared.What I didn’t realize the dash told me me what the code was when it was resetting it.Showed the 37 and didn’t even have to count the flashes.So being the scooter had the iridium plug when I bought it then was having start issues last year I put another iridium plug in it and wouldn’t start this year.So I’m sticking with the copper plug.The scooter only has 2000 miles on it don’t know why the coil went bad looked like new so from what I’m thinking this will be it’s 4 th plug.
Title: Re: What plug are you using
Post by: scooterfan on April 09, 2019, 04:58:06 AM
It sounds like you installed a new coil but you didn’t try to start the scooter with the Iridium plug since the new coil has been installed ?
Title: Re: What plug are you using
Post by: KymcoRockr on April 09, 2019, 06:41:06 AM
I'm trying to find an iridium plug for my Kymco X-Town 300 i, but can't seem to find one anywhere online.
Does anyone have a clue if these is an iridium plug available for this model?
There is. GIYF.
I have gone from using NGK to using Denso plugs, because I've had too many very low mileage NGK plugs stop firing under compression lately. This is something that tricks a lot of people, because you will pull the plug out and hold it against the frame, and it sparks like crazy, but back in the bike, it won't start. A friend of mine imports vehicle parts, and he said there are too many people in
China selling plugs that say NGK for about what you would pay for a Chinese brand. He's been asked before if he wanted to buy belts that are gates, or ones that say gates on them. The price for the later is quite a bit less, apparently, so draw your own conclusions. I did, and I think it's more reliable to go with a brand that isn't quite so popular and tempting to copy.  Other than that, I think that if you take someone that really believes there's a difference between plugs and told them that two scooters with the same plug had different plugs, and one was their personal "best," brand and the other their "worst," brand,  that person could discern a performance difference between the two plugs after a short ride around the block. On the other hand, if you put ten different plugs in ten different scooters and said they were all the same, someone who really notices a difference between spark plugs would be able to tell they were all the same.
As far as fouling is concerned, on an EFI Scooter the problem is usually either a bad battery or a bad charging system, usually the Regulator or coil, so the scooter is running off the battery and it's running low. Because so many people are obsessed with using battery tenders, and do relatively short rides, a bad battery can cause problems for years before it finally packs it in for good.
Title: Re: What plug are you using
Post by: scooterfan on April 09, 2019, 09:30:48 AM

I have gone from using NGK to using Denso plugs, because I've had too many very low mileage NGK plugs stop firing under compression lately.



Did you refer to NGK iridium spark plugs on a Kymco scooter, or NGK spark plugs in general ?

 I assume you mean you don't experience problems with  Denso iridium spark plugs on your scooter, but you experienced problems with NGK iridium spark plugs on the same scooter previously ?







Title: Re: What plug are you using
Post by: KymcoRockr on April 09, 2019, 12:52:41 PM
Just the ones that quit working. ONe was in a Kymco, a couple were in other scooters. I've previously only seen this with very low end plugs. I really don't think it matters what you put it in, if a plug doesn't fire, the results are going to be the same. The problems I've been seeing with NGK plugs were not with the Iridium versions.
Title: Re: What plug are you using
Post by: roxyflash on April 10, 2019, 12:53:37 AM
It sounds like you installed a new coil but you didn’t try to start the scooter with the Iridium plug since the new coil has been installed ?
.    No I didn’t I have the first iridium NGK that came with bike I have the second iridium plug that has about 200 miles on it that’s the one that wouldn’t start.I bought a new copper plug it was for a spare I didn’t want to spend the extra 10 dollars when I bought the iridium last year so I bought a cheap autolite for 1.69 as a spare for my tool kit.So I used the new plug with new coil I hit the starter it started instantly this is with the battery that was in the scooter.When I bought the iridium the guy said why do you want the cheaper plug the iridium will last forever but I wanted a spare.I also have a enduro bike Suzuki PE 175 it was running poorly was just rebuilt probably rode it 6 times I had a Denso u groove plug not sure how it ended up in my toolbox but put it in the Suzuki couldn’t believe how good it made it run the NGK was just a standard plug I also run gas rc boats with zenoah engine for what ever reason never had a issue with the small NGK plugs .I have dunked the boats many of times and never fouled one out I use klotz oil in my dirt bike and zenoahs at 32 to one.                                                                                                                                     
Title: Re: What plug are you using
Post by: Viper254 on April 10, 2019, 07:16:56 AM
It may be an irrelevant comment, but when I was in the trade (left 2015) of buying parts, we were having huge amounts of problems with fake NGK plugs working their way into the supply chain, or "real" NGKs that weren't up to UK standard; imports.

I think that these creeping their way into our bikes over the last 10 years has damaged their reputation a bit. It hasn't really happened to denso, which is why I think the above comment about changing to their plugs is generally a pretty sound plan.
Title: Re: What plug are you using
Post by: scooterfan on April 10, 2019, 07:48:43 AM
Reading about the misfortune with NGK plugs I think part of a solution will be only to buy NGK spark plugs from a well known, reputable dealer.
For example - I know for a fact that all NGK spark plugs available at Autozone branches in South Africa get imported by Autozone directly from the factory in Japan.
I know this as a fact - because during the early days of my Honda NC700 ownership I negotiated with Autozone Head Office in South Africa to start importing NGK Iridium spark plugs for Honda NC700 motorcycles.
At the time the price for Iridium plugs at Honda was completely insane, therefore I started negotiations with Autozone head office. Autozone initially informed me about their process of importing NGK spark plugs, and long story short - we ended up having the exact, high quality NGK product, directly from Japan - available at Autozone branches for about 1/4 of the price at Honda.


Title: Re: What plug are you using
Post by: kneeslider on April 10, 2019, 02:31:44 PM
It may be an irrelevant comment, but when I was in the trade (left 2015) of buying parts, we were having huge amounts of problems with fake NGK plugs working their way into the supply chain, or "real" NGKs that weren't up to UK standard; imports.

I think that these creeping their way into our bikes over the last 10 years has damaged their reputation a bit. It hasn't really happened to denso, which is why I think the above comment about changing to their plugs is generally a pretty sound plan.
Sorry but Denso is having huge issues with replica parts. In Malaysia the fake Denso market is so big that to ensure you get the deal item, you should only go direct to an authorised dealer/workshop.

Sent from my HUAWEI VNS-L31 using Tapatalk

Title: Re: What plug are you using
Post by: scooterfan on April 10, 2019, 04:30:23 PM

Sorry but Denso is having huge issues with replica parts. In Malaysia the fake Denso market is so big that to ensure you get the deal item, you should only go direct to an authorised dealer/workshop.

Sent from my HUAWEI VNS-L31 using Tapatalk


Thanks for your comment, I think it just proves that we all need to start thinking more than twice about all this negative talks about Iridium plugs at this forum.

To my mind it looks like we can only start discussing spark plug quality whenever we start buying spark plugs from a reputable supplier.

Title: Re: What plug are you using
Post by: Stig / Major Tom on April 10, 2019, 07:32:48 PM
When I buy filters, plugs, etc. for my Scion on ebay - I buy only from a trusted Toyota dealer I've dealt with for years.

Just went to change my Denso Iridium's on the Scion - bought part # per the owner's manual - but original plug I removed was a different number!
I don't argue about who is correct - just ordered 4 more. Not going to quibble about four 7 yr plugs for $25.

Stig
Title: Re: What plug are you using
Post by: roxyflash on April 10, 2019, 10:07:16 PM
I bought the plugs from advanced auto parts the only reason was they had the iridium plug I believe it to be a genuine NGK .For now I’m sticking with the copper plug the scooter has never ran better maybe the coil was failing or the plug was the issue can’t say as I’m not changing anything right now the downtown is running like a champ.What I do know is the coil was the main issue otherwise the celp light wouldn’t have been on with a coil fault code.The reason I bought the iridium is because on this forum everyone recommends using them I didn’t know the scooter had one in it already so far I’m not sold on them and had bad luck .Sorry to bash NGK but haven’t had any luck with them.Remember as a kid going tru them on my ts 125 Suzuki bought them all time would foul them out at least once a month or more never went dirt bike riding with out at least one or spares.
Title: Re: What plug are you using
Post by: CROSSBOLT on April 11, 2019, 01:42:38 AM
Apples and oranges! A Suzuki TS 125 is a 2-stroke from 1981! Two-strokes are notorious for being finicky about plugs, plug heat range, oil and gas. Not so much since good electronic ignition but still big deal different than four-strokes. Sheesh!
Title: Re: What plug are you using
Post by: kneeslider on April 14, 2019, 01:07:48 PM
To me the dyno charts which show improvement in engine performance is because it's being compared between a worn plug against a new plug.
Title: Re: What plug are you using
Post by: Viper254 on April 14, 2019, 03:48:39 PM
Sorry but Denso is having huge issues with replica parts. In Malaysia the fake Denso market is so big that to ensure you get the deal item, you should only go direct to an authorised dealer/workshop.

That's a shame - don't see so many Densos here in the UK.
Title: Re: What plug are you using
Post by: kneeslider on April 15, 2019, 02:11:33 AM
In Malaysia, majority of the locally and Thailand manufactured vehicles mainly use Denso, especially the radiators.

That's a shame - don't see so many Densos here in the UK.
Title: Re: What plug are you using
Post by: xsel777 on April 17, 2019, 01:43:15 PM
I also am a fan of iridium plugs. The Cr8eix my xciting 500 takes has given me problem free riding in terms of spark.
I especially like that I don't have so change it often, as it is a tight space to get it out.


Sent from my Mi Max using Tapatalk

Title: Re: What plug are you using
Post by: mousejunks on April 25, 2019, 11:17:11 AM
CR7EIX - because I never want to change spark plugs again
Title: Re: What plug are you using
Post by: ccemn1 on May 24, 2019, 06:25:42 PM
Ok battery new when bought scooter February 2018 always been on a moose charger never been discharged.Your wrong about iridium plugs.The articles I read tru state there’s plugs for different applications .Like my old truck they don’t recommend iridium but just copper plug.I used a group 31 battery when I was testing for spark.Brand new charged.Like I stated this scooter acted up last summer when I didn’t want to start acted like there was no spark.The only other thing is it’s possible the starter could be drawing to many amps but doesn’t act like that.When it acted up last year I cranked on it then let it sit for a minute then tried it again battery was getting low the battery light would come on then it would start.I did this like a half dozen times.I then did the vent on gas cap and set valves but weather changed from 90degree to 80s.probably why it’s a 2012 with low miles nothing but trouble starting so they traded it off like I said there’s got to been issues with spark being it had plugs that have been changed before I bought it and there’s not many miles on it.I had a cheap Tao Tao 50 scooter same mileage and never changed a plug even after putting a 77 cc kit on it.The worst thing about the downtown doesn’t have a kick starter and has a very small battery with lights on trying to start it.Hopefully I get this figured out but so far my old Tao Tao was more reliable always started.I believe I got someone else’s headache mow it’s mine
I just like the fact that I can install iridium plugs, and not have to change them, gap, or worry about them for the rest of my life.
Of course if you prefer, you could also go back to points & condensers.