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    Coolster Challenger 250cc lost performance??

    No problem on the pic. I think the clutch is locked up. Can't get it to move. I don't know if the overheating affected it but I noticed some fine cracks on the belt surface? I'm gonna get a new one and at least not have to worry about it. I'll let you know how that goes. Hopefully I can post...
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    Coolster Challenger 250cc lost performance??

    I don't have a scale that measures grams. Maybe I'll pick one up since that's a good idea you said to weigh them. As far as the driven pulley, there must be a problem cause I can't get it to budge. I tried standing on it and it seems frozen in place. I believe it overheated because the bell was...
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    Coolster Challenger 250cc lost performance??

    I'm gonna pull it apart and check it. Makes sense what you said. Rollers look good. Don't see anything obviously wrong. Here's a few pics.
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    Coolster Challenger 250cc lost performance??

    Don't have pics right now but it's this one in this link. I had the cover off and when I had it running the cvt appears to be working fine. Pulled the clutch bell off also and sanded the pads/sandblasted the contact area on the bell. I see from the specs, it's rated hp is at 7000 rpm and I know...
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    Coolster Challenger 250cc lost performance??

    I posted another topic when I had the weak/no spark question which is fixed and I thought would've helped performance but it hasn't :( Just took it for a ride and it starts right up and runs good but for some reason top speed used to be close to 50mph now is only 28? Can't feel any slippage in...
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    Coolster 250cc kart strange ignition problem.

    Got it going and rewired the lights so they're working again and it's getting spark like normal and starts up. Haven't taken it for a ride yet to see if the lost speed has returned. Hopefully it has. Thanks for the help everybody.
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    Coolster 250cc kart strange ignition problem.

    Well, maybe I'll test it to be sure. I have a meter to do it with.
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    Coolster 250cc kart strange ignition problem.

    I'll get another one. Just a cheap Amazon one and this is the 3rd or 4th one on it cause he had a habit of leaving it out in the rain/snow and water was getting in them and messing them up to where it wouldn't even crank. Water could've gotten in this one as well. Thank
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    Coolster 250cc kart strange ignition problem.

    Pulled the ignition and it seems he had it wired wrong, it's 3 wires being 1 battery, 1 ignition and 1 starter so I put them where they belong and it is getting spark all the time and started up but with 1 problem......no lights work now? lol typical luck for me. They worked before I swapped...
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    Coolster 250cc kart strange ignition problem.

    Humm, that's a idea. I'll try to "hot wire" it and see what happens. Thanks
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    Coolster 250cc kart strange ignition problem.

    I just picked up a Coolster GK-6250 kart with a gy6 250cc engine and I'm in the process of fixing it up but I'm having a strange ignition problem. The guy I got it from said it used to do about 50mph top speed but has slowed down for some reason. I got it running and indeed I can only get it to...
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