KymcoForum.com
Scooters - 50cc => Super 8 => Topic started by: mlsmith2924 on May 11, 2017, 05:15:11 AM
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so I just got my super 8 50x 2016 derestricted (main jet, smooth boss, manifold washer removed) and I can only hit 35 on a flat. Am I missing something here? the mechanic said he was surprised it wasn't hitting 40. Any recommendations for air filters and exhaust?
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Also I asked about the cdi, and he said if it runs at 12000 rpm for too long it can damage the engine. If I cut the wire in the stock cdi, is it completely unlimited rpms or An increase?
My bikes a 4 stroke and has an 8 pin cdi
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Following this.
Mine came with smooth boss and larger jet. I replaced the boss and unhooked the violet wire and currently get 35 mph. I found that once I replaced the boss though that I issues with accelerating at the top end. I am looking into getting the jet upgraded.
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keep me posted man, i'm curious to see the long term results. I can find out what size jet the mechanic installed as well if you'd like
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I got the jet installed today. Went from a 75 to an 82. Better ability to hold the top end now and getting there a little faster.
I did manage to hit 40mph downhill though after.
So the list of what I have done:
1. Removed violet wire form harness to CDI - close 32-33 mph on flats
2. Change boss - got to 36 mph on downhill still 32-33 mph on flats but very boggy
3. Changed Jet to an 82 - solid 32-33 mph on flats got to 40mph downhill engine was peppy again.
The guy who did the jet for me told me I needed to change the exhaust and up the jet to a 92 to get the most out of it.
Was there a washer in the Intake Manifold? The guy I was dealing with today didn't seem to think so.
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Following this.
Mine came with smooth boss and larger jet. I replaced the boss and unhooked the violet wire and currently get 35 mph. I found that once I replaced the boss though that I issues with accelerating at the top end. I am looking into getting the jet upgraded.
I assume by "came with smooth boss..." that your shop already upgraded it? The Super 8 does not come with a smooth boss... it has a wide ring at one end. If it was already smooth why would you replace it?
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TSEG I did not have to buy one as there was one in the seat compartment already with a larger jet in a ziploc bag from Kymco.
I had to install the boss myself it all. Was surprised that the dealership had not done it already but they wanted to charge me for it.
Live and learn.
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Usually 4 strokes don't have exhaust restrictions and the main restriction is usually the CDI and Boss. Upjetting does help a bit maybe especially when modifying the air intake volume.
Also, possibly some dealers don't want to sell you the bike fully derestricted as it can make the bike illegal. For instance here in Connecticut the law is 2 BHP and 49cc. A fully derestricted 49cc will be more like be 5-6 BHP.
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I got the jet installed today. Went from a 75 to an 82. Better ability to hold the top end now and getting there a little faster.
I did manage to hit 40mph downhill though after.
So the list of what I have done:
1. Removed violet wire form harness to CDI - close 32-33 mph on flats
2. Change boss - got to 36 mph on downhill still 32-33 mph on flats but very boggy
3. Changed Jet to an 82 - solid 32-33 mph on flats got to 40mph downhill engine was peppy again.
The guy who did the jet for me told me I needed to change the exhaust and up the jet to a 92 to get the most out of it.
Was there a washer in the Intake Manifold? The guy I was dealing with today didn't seem to think so.
https://www.youtube.com/watch?v=AATbMHQsau4 (https://www.youtube.com/watch?v=AATbMHQsau4)
heres the link for the washer on the intake manifold
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It's a violation of some State, and also Federal regulations to modify things on a new motorcycle/scooter that affect emissions in any way.
Subject to all sorts of licensing schemes, it's probably not the wisest thing for a dealership to mess with them, when selling new models.
Once they become a used vehicle there's probably little to no risk.
It can be tedious messing with the jets, but that is the only way to assure best performance from any small engine.
redk
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TSEG I did not have to buy one as there was one in the seat compartment already with a larger jet in a ziploc bag from Kymco.
I had to install the boss myself it all. Was surprised that the dealership had not done it already but they wanted to charge me for it.
Live and learn.
Got it, now understood. Relative to your pulling the violet/purple wire... there are 2. Which one did you pull? The one on the left or right?
Edit: Did some searching and identified pulling either would work... did it. My son just went around the block and said he got to 31 mph and still had not wound it up all the way.... previously he could only max out at 28 mph, do definitely improvement.
Only concern... I saw 1 post somewhere that there is a theory derestricing CDI without desrestricting Boss can cause long term damage... and derestricting Boss without putting in #82 jet can cause long term damage. Anybody with thoughts about CDI only derestriction and long term damage?
(https://c1.staticflickr.com/5/4191/34589548936_b160c3490e_b.jpg) (https://flic.kr/p/UGytPo)
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Where I am from the restriction is speed. Cannot go past 43.5 mph (converts to 70kph in Canada).
I did the wire first Tseg and then did the others. I had done the boss first but it just bogged down and couldn't get and real speed without the extra fuel. Had a garage install the jet and tune the carb. Works well once it warms up now.
I am looking at Sport/High Speed variator kit with the upgraded torque spring and heavier rollers. I will look into the washer if this is the case I will up the jet to a 90 or 92 to make up for the extra air. The only other thing I can think of at this point is actually changing the exhaust like Roytheroach mentioned.
So far 36 mph (58kph) a flat and 41.5mph (67) on a good downhill.
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So I have purchased a Polini High Speed Variator and Technigas Silent Pro Exhaust. mlsmith2924 I will let you know how this goes.
Tseg I think the Variator should clear the rev issue when you disconnect the Purple wire.
I will also look at a bigger jet as well to match the exhaust.
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Also I asked about the cdi, and he said if it runs at 12000 rpm for too long it can damage the engine. If I cut the wire in the stock cdi, is it completely unlimited rpms or An increase?
My bikes a 4 stroke and has an 8 pin cdi
Cutting that wire disables a rev limiter feedback circuit.
This brings You the opportunity to make the decision if you Must have more rpm for the occasion.
Yes. 12k rpm is racing rpm and will most likely wear out your motor in the time of a single race.
Simply because you Can does not necessarily mean you should.
redk
If you're not first, you're last." - Ricky Bobby, Talladega Nights
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So variator in and new Exhaust on. Better pick up and better on hills. Won't know about top end till I get a get a good flat then and a proper ride on it.
Just need to get upjetted and tuned properly. Will pay for that part though. I don't play with carburetors.
Will give the update after I do that.
Cheers
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even on a good running 49cc scooter, expect 27 MPH or lower on the steeper hills.
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So I have purchased a Polini High Speed Variator and Technigas Silent Pro Exhaust. mlsmith2924 I will let you know how this goes.
Tseg I think the Variator should clear the rev issue when you disconnect the Purple wire.
I will also look at a bigger jet as well to match the exhaust.
Yes! please do good sir
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Everything on and in place. I still haven't removed the washer in the intake yet.
Waiting till I can get a bigger jet first to make up for the extra air.
Will let you know how the my first ride goes this morning.
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So what I have done so far.
Replaced Boss
Replaced Variator with Polini high speed (using stock smooth boss) and 6.9 gram rollers
Replaced original 80 jet with 82 jet (this came with the scooter when I purchased it)
Replaced stock exhaust with Technigas Silent Pro
Removed washer from intake valve.
What I noticed from test run.
Better acceleration, holding 37 mph on flats (was a quick test ride so motor never got warm)
I was getting a popping noise before I took the washer out. When driving it with that I did hit 43.5mph on a down hill
Next I am going to try a lighter roller, maybe 6 or 6.5 grams
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Nice, I finally grew some balls and cut the CDI wire. There was a definite power gain and I hit 40 on a flat, 42 downhill! thats all I really hoped because I live in Boston and theres a street light every 5 feet.