KymcoForum.com
Scooters - 125 to 300 => Agility 125 => Topic started by: topaz6turbo on April 13, 2010, 11:39:52 AM
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Hey, a quick question. My scoot has been loosing top speed over the last month. Flat out with no wind on flat ground it wont go over 95kmh. I thought it was due to the 10 weights, so fitted the 12s and its exactly the same. Would it be valve adjustment due, or a worn belt or any thoughts? Running fine and grunts to 80 nice and quick, but just lacking the top end. Any advice or help is welcome!
Thanks
Holty
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..it could very well be your valves out of adjustment, or a worn belt...
..if you've never adjusted them, with 6500 km, i'd put some money on the valves..
..normal lobe and rocker arm wear occurs over time..this causes a greater gap betwen the arm and the valve stem, which keeps the valves from opening as much as they should, which pulls in less fuel mix...
..my A50 calls for adjustments a 2000, 4000 and then every 4000km....
..gradually dropping top end, with everything else running fine, is a good sign that they are getting out of spec..
peace
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Could it be cold weather?
Cold air in intake system and less gas...
ive got 85 on the rain and wind....gonna try to adjust air/gas...screw
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Could it be cold weather?
Cold air in intake system and less gas...
ive got 85 on the rain and wind....gonna try to adjust air/gas...screw
..i lose 5-8 mph or so in the rain, and the weather is getting warmer, so i wouldn't think that's it's due to the cold...
..and again...these 4-strokes require periodic valve adjustments...
..it's just the nature of the beast...
;D
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The air /gas screw ONLY affects the idle Mario. You could tweak it a little to adjust for the best setting. They all need this done every so often, but it will not affect the running of the scoot. You could add double the dose of Sea Foam to the fuel. If your main jet is getting varnished, or clogged from fuel additives a couple tanks w/ this may bring it back for you. Also check, and clean the air, and fuel filters. A new spark plug may just be the ticket also. As the plug wears the gap increases, and the performance does drop. Add that to the valve adjustment, and I believe you will be good as new
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My scooter massively lacks performance even with a new plug and a totally cleaned out carb. I've got a fuel filter, air filter, drive belt and dr pulley 13g rollers on order. Also will do the valve adjustments while i'm at it. Could the valve adjustment be the reason I'm running lean?
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Yes! It would not allow enough fuel mix into the jug before closing. This amplifies itself in heat inside the cyl. so it is best to have a shot at adjusting them. A before, and after compression test is also a VERY good idea. If there is a burnt exhaust valve from the heat, that is the easiest way to find out.
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My scooter massively lacks performance even with a new plug and a totally cleaned out carb. I've got a fuel filter, air filter, drive belt and dr pulley 13g rollers on order. Also will do the valve adjustments while i'm at it. Could the valve adjustment be the reason I'm running lean?
..yeah, whatzombie said...and...
...and i'm not sure about your rollers...i heard topaz talking about 10s and 12gram rollers...
..couldbe that the 13s are a bit heavy for your scoot....
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...and i'm not sure about your rollers...i heard topaz talking about 10s and 12gram rollers...
..couldbe that the 13s are a bit heavy for your scoot....
Stock are 14g, so..
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There may be a vacuum leak (loose hose) or several other small things going on. Post back once you give it a good going over, and we'll take it from there.
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Ok, I run full synthetic all day everyday in everything I own. It has an Iridium plug thats 2500km old and has run on premium (98) fuel since day dot. It has no airfilter currently (full airbox there just no filter) as I am going to fit the bigbore kit, and thought I would try it without a filter around 4 months ago, and its still sitting on the shelf in the garage, never re-fitted! I did something the other day and run plain simple basic fuel thru it, and I reckon it gained top end by around 5kmh! It had 1500 springs in the back end, a dr pulley variator, 12g weights, a 110 main jet and the free flowing pipe. I am going to try the tappets this weekend and see if that helps, as its either them or the belt I reckon. If that doesnt work, it might be time for more power and fit the kit!!!!
Talk soon, and will update once adjustment made.
Holty
Ps, what the hell is seafoam???
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Ok, I run full synthetic all day everyday in everything I own. It has an Iridium plug thats 2500km old and has run on premium (98) fuel since day dot. It has no airfilter currently (full airbox there just no filter) as I am going to fit the bigbore kit, and thought I would try it without a filter around 4 months ago, and its still sitting on the shelf in the garage, never re-fitted!
Um, that's not a good idea.
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Put a filter in it. Even dust can accumulate inside the cly/rings, wearing everything out. Sea Foam is a fuel additive that is primarily Propanol. I use 1oz. per tank every third tank full. It is GREAT at keeping the carb clean, rings free, and carbon to a bare minimum. Running no air filter for sooo long I strongly suggest you find some, and run it thru the next 3-4 tank fulls.
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..carb cleanin' a comin'............
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To tell the truth, it would give me an excuse to fit the kit and be done with it. I need more power, and figured the thing would have clagged up by now, but still going..... I am thinking next weekend is a 3 day weekend for us, might be a chance to bolt the thing togetehr and not bother with the valve adjustment..
Will keep you posted!
Holty the free breather....
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Watch which kit you get. Stay away from the ones that re-use your head. I think a COMPLETE kit was $380.00 from arisol.
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Ok, gave the pocket rocket a service and popped the rocker cover off for a quick suss. I cheched the clearances and all 100% perfect. I guess I may be a 6 foot 120kg man expecting too much from his scooter!
Holty
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Well the time has come, its 10pm Sat night here and tomorrow Im fitting the big bore kit to my Agility 125. I want and need more, and as its a long weekend here, Im going to just do it tomorrow! Zombie, can you post the pic of my kit. I will try take the time to take pics, but that will only be on the phone, and when I want to stop. I CANT WAIT TO GET THIS DONE!!!! If this doesnt make the baby sing, I will be moving onto a bigger bike I think!
Holty
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Here's a pict that Holty emailed me. I have to say he found a very complete kit! It should work out fairly easily.
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Ok, all was going well until I tried to dummy fit the barrel. Waaaaaaaaaaay to big for the hole in the block. My pison measures 59mm but the hole in the block is only 61mm, so theres no room for the lower section of the barrel to fit into the block. Im in 2 minds now as to weather I strip the bottom end and machine the block to accept to 63mm big bore kit and be done with it, or simply machine a small amount off the skirt and slip this 58.5mm kit in for now. Very dissapointed, and was expecting to be belting some miles on it today, but it will have to wait. I think the block will get stripped and machine, so at a later stage I can go to the 190cc kit and be done with it.
Will let you know what happens!
Holty
Ps, on a side note, the engine is in extremely good condition for the 7000km it has done so far. I reckon it would do a heap more looking at its current condition, just not enough grunt for me! The barrel and piston could be simply swapped onto another engine without batting an eye. Its perfect. I must commend Kymco for there quality, its a good thing.
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All Except for that. If you haven't already sent it all back... Most of the kit can still work out for you. Put on everything but the jug kit, and you may wind up w/ a betterr deal, and running scoot!
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Well, stripping the motor as we speak, going to go the whole hog so I can fit the 190cc kit, and wondering who has used the stroker cranks for these? I see 2 sizes are available, and think I might consider making an animal seeing as Im going this far into it. Word of advice, my 7/2008 plated Agility will not accept any bigger than tha factory barrel. Dont listejn to the hype from the dealers, they want your money, but the larger kits wont fit without machining work. Maybe different generation motors in early or later versions have larger access, but mine was useless.
I will advise when done......So miss not belting around on my scooter and its only day 3.
Holty
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G'Day Holty, with the oversize barrels don't they say the crankcase needs to be bored out? I thought I saw that on one ad, but that might be a different brand. Keep at it, will be worth it when done.
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As for the strokers, there are two things to keep in mind. 1: the bore/stroke of the jug going on, and you will need to do the math for that one to match the con rod length to the stroke of the jug. 2: that the jug will work with the extra diameter of the crank. There are soo many kits for these scoots, it is hard to tell w/ will work w/out a degree in engineering.
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Sloth, the seller told me it was a bolt on option with the 58.5mm kit, but thats a joke. Soooooo, with the thing in bits its a good opportunity to open it up now for later upgrades. I will just start looking once Im finished this install and when I find a good package of nits will grab it and make it happen. In the interim Im going to have some fun. I have really enjoyed working on the scoot, and cant believe how much I have missed this. I might even finish my offroad go cart once this is done, thats how much it has inspired me.
Be good and I will advise outcome, which I reckon will be this weekend.
Ps, when I went and ordered my gasket kit for the bottom end, I grabbed some front brake pads (factory Kymco) for $12 outright! Bloody amazingly cheap fun these things....
Holty
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I would be very careful when ordering a stroker crank. Unlike many other GY6 engines the bearings which sit on the crank are different sizes. If my memory serves me correctly the right bearing is substantially bigger than the left one. I used a donor crank from a normal GY6 and found out the hard way that this was the case.
Also if you do split the case I'd like to know where you get your gaskets from. There are many parts I need here in the UK but the dealers are insanely expensive.
Gray
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Well the housings are nearly finished being machined to 65.5mm so hopefully with time allowing I will start getting it back together this week coming. My head is just back from the porters, and looks so nice all ported and cleaned up. He took a fair bit out just in from the bowl and cleaned the whole lot up, so keen to see how it works when its on the bike. He said even though it was classified as a big port head there was still room for improvement and that he spent nearly 3 hours cleaning and changing the ports. If this thing doesnt rotate the earth on an eneven axis when I get ity back together I wont be happy!
Holty
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Come on Holty, stop holding out on us.....how did it go? we are waaiitiing.:)
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If this thing doesnt rotate the earth on an eneven axis when I get ity back together I wont be happy!
Holty
..woo-hooo!!!
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..... oh, hang on, looking at his username, if he is driving Ford XR6 turbo, he is probably still having too much fun and forgot his scoot???
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Well F^ck me sideways! Did an upgrade to the pc, lost the password and I couldnt get back on and have finally got thru!!!
New password set and rolling again baby!
Ok in answer to some of your questions, work got really busy, and it got cold and wet, and the scoot hasnt moved any further than the last update. I did split the block and machined the housings and ready to go back together again, and now that its stopped raining, am planning on taking next Sat off work to get her rolling again.
In relation to my name, it actually relates to my Mrs car, she has an early Celica that we fitted a twin cam twin turbo efi 6 import motor into (1GGTE and Supra box)), and has the rego plates "TOPAZ6" and being a turbo, just seems to fit ok. Its out ebay name and everything. Just simpler that way.....
How the hell has everyone been? Much happening here or what? I nearly bought a 250cc scoot a couple of weeks back, but decided to get back on mine, and am looking to buy a late model Holden Commodore ute, to replace my early model Commodore ute. I WONT OWN A FORD SO DONT INSULT ME!!!
Good to be back....
Holty in Oz
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Noting wrong with Fords mate.
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I had 3 fords as company cars in the past, and both employers se=worn off them now. All Holden and Toyota without a single ford in either fleet.... better resale for the holdens too! Plus I own a clubsport and commodore ute so am a little biased as well!
I gather your a ford man, and wont make this a "them/us" thread...
Holty
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she has an early Celica that we fitted a twin cam twin turbo efi 6
..i had an 83 supra that id put up against just about anything in an eighth...back in th' day..
;D
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No fear mate, I would rather talk about scooters and the like here. :)