06-24-2022, 08:14 AM | #1 |
Join Date: Jun 2022
Posts: 2
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Need help with high-revving Kazuma!
I have a Kazuma (maybe 50cc?) that has a pedal shifter but no clutch cable. This seems standard. However, when the atv is in neutral, the engine revs like CRAZY and will pop a wheelie if I throw it in gear. While in gear, it has little to no power. Pressing on the accelerator doesn't do a thing. If I turn on the choke while in neutral, the engine dies completely.
Here's what I've tried: Replacing the carburetor with a new one. No change. Spraying around the connections between the carb and the engine with starter fluid, looking for an rpm change to see if air was leaking into it. No change. Removing the throttle cable from the handlebar to see if it was too taut. No change. Checked timing-- top dead center seems to match on the flywheel and the cam. Although this depends on the direction I rotate the engine. The only way to rotate it without the nut coming loose is to rotate it clockwise. When I do this, the engine timing seems right. But there is enough play in the chain that when I let it go slack, it may be out of time. This is likely normal, and I can't imagine this would be enough to cause this problem. Any thoughts on what would cause an insane idle with no power under load? I really need help. Thank you! |
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06-24-2022, 08:43 AM | #2 |
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Join Date: Oct 2016
Location: Houma, La.
Posts: 11,707
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There shouldn't be any slack in the timing chain. It's possible the chain jumped a tooth. You've done everything else that eliminated carb and fuel issues.
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06-24-2022, 10:25 AM | #3 |
Join Date: Jun 2022
Posts: 2
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Would a timing issue cause the engine to rev super high in neutral? I don't see how...
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06-24-2022, 10:26 AM | #4 |
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Join Date: Oct 2016
Location: Houma, La.
Posts: 11,707
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Yes if the timing is advanced.
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2024 Linhai 300 ATV 4x4 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel |
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