kglazer
Scoot Enthusiast
Posts: 198
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Post by kglazer on Jun 1, 2011 10:26:47 GMT -5
yeah i really dont know what to do about this flat spot i have so many different answers and dont know which one to assess first guys. should i change the rollers, the clutch/contra springs or change the jets of the carburetor. the rollers someone said could already be flat cuz they came from technigas and they are known to not be good rollers at all and can come flat already shipped. Any experience with this situation and how you resolved would be great. i cant even ride it because its not running over 30mph
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Post by marshinman on Jun 1, 2011 16:29:13 GMT -5
I am not as experienced as the other so I can not answer for the rollers or springs.
Before you go and spend money on something that you may not need why not try the things that will not cost you much if anything.
I had a similar problem with my Marshin Viper that has a 4t on it and by cleaning the fuel system and then adjusting the needle helped out.
I did end up making a drill bit out of a sewing needle to open the main jet up slightly and the flat spot went completely away.
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kglazer
Scoot Enthusiast
Posts: 198
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Post by kglazer on Jun 1, 2011 17:16:18 GMT -5
yeah i beleive my carb is a pb 16? where can i get jets for these locally do stores carry them?
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Post by marshinman on Jun 1, 2011 18:18:40 GMT -5
Ask 90GTVert he would know the best.
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Post by 90GTVert on Jun 1, 2011 19:55:44 GMT -5
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kglazer
Scoot Enthusiast
Posts: 198
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Post by kglazer on Jun 1, 2011 21:23:48 GMT -5
thats what i heard comes on the s9 but oh well lol. i guess i will take off the carb and get the jets and take them to petes cycles thats the closest place and see if they can match one up. how much bigger should i go from the one thats in there now?
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Post by 90GTVert on Jun 2, 2011 8:05:15 GMT -5
That may be right, but I'm not familiar with the Kymcos.  Just to test the theory, you could pick up something 5-10% larger or about 5 numbers (if 70 get a 75). That would be enough just to see if there's an improvement by upjetting. You may not get it in tune that way, but you'd know if you needed to buy more jets. |
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kglazer
Scoot Enthusiast
Posts: 198
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Post by kglazer on Jun 2, 2011 12:50:40 GMT -5
yeah. also i was thinking i could get a no rev limit cdi? do you think that could be why its cutting out. it feels like it has more power it just doesn't wanna go higher. i changed down to 6.5 roller weights and the power band seems more usable but i still cant get over 30 mph on flats. i didn't get a chance to go look at the jets. but now I'm starting to think its the rev limiter because it just seems like it doesn't wanna go any higher. Are there any downsides to getting a no rev cdi like over reving- can u blow the engine up with too high of revs?
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Post by 90GTVert on Jun 2, 2011 13:57:04 GMT -5
You could blow the engine revving too high, but you'd have to work at it. I'd ditch the rev limiter if one is equipped without a doubt. I suppose it could have one if it's never been faster. Maybe someone will know about your scoot in particular? The 30 on flats and 40 uphill is what's really throwing me.
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kglazer
Scoot Enthusiast
Posts: 198
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Post by kglazer on Jun 2, 2011 14:24:23 GMT -5
yeah well actually i just put one of those bicycle spedometers on with the magnet on the wheel and found out that my speedo is way off so infact it goes slower uphill then on flats. on flats it does 30 and uphill like 23mph. for some reason my speedo is being more gracious going uphill lol. so with this solved how can we reassess the problem and fix it lol.
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Post by 90GTVert on Jun 2, 2011 14:50:53 GMT -5
OK, well now it more clearly sounds like a lack of power either from restriction or lack of revs. Try a Google search with your year and model included as well as restrictor or cdi or limiter. Something like that. Maybe you'll come across a common issue and fix. Sometimes if they have limiters they can be disconnected by cutting a wire, sometimes you need to replace the CDI.
Being out of tune is still an option. Never a bad idea to look at the plug.
Could still be the CVT. Possibly it needs lighter weights to get the revs up?
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kglazer
Scoot Enthusiast
Posts: 198
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Post by kglazer on Jun 2, 2011 21:10:36 GMT -5
well i tried the lowest set of weights i had and it definitely is driving better mayb i will go pick up some lighter ones. my cdi has a limiter but its at 10,000 rpm thats what one site i found. all the others there are no real answers to them. its a 2008 kymco super 9 air cooled. they offer no rev limit cdis for my model so i assume it is restricted but 10,000 rpm is alot i wouldn't think i need to go higher.
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Post by 90GTVert on Jun 3, 2011 6:47:58 GMT -5
If it's liquid cooled, I'd think picking up a no rev limit CDI would be a good idea. Never rode one, but I think they like to rev a little more? Maybe that's just with all the nice aftermarket stuff for them? If it's air cooled, you'll probably be OK. Not saying you can't hit 10,000, but I don't think most AC scoots will wanna go much above that if to that making power stock.
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kglazer
Scoot Enthusiast
Posts: 198
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Post by kglazer on Jun 3, 2011 10:22:36 GMT -5
its air cooled so i think im gonna leave the cdi alone then and play with the weights
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Post by 190mech on Jun 3, 2011 11:24:44 GMT -5
I read elsewhere that a P/N 169-27 CDI box at PFS for a GY6 is THE one to run on an AC Super 9
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