Two stroke bicycle engine bucking bar clutch problem

JerboaJohn

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Jul 29, 2018
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1,233
sounds freaky,, what about something wrong with the bucking bar n ball? not likely but maybe look into if it's not the chain hitting??
other than those things the little bearings in the clutch assembly can be smooshed and come out. a new clutch isn't expensive
 
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Will'smotobikes19

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Apr 9, 2018
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1,642
These bucking bar problems are odd to me I've never encountered it. Among the other problems. Improper length? I think the inner spring is adjustable or something might be off. Theres collars on the shaft.
 

willdoucette

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May 5, 2019
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Thanks for all the replies everyone, I am trying all your suggestions now. However I have ran into another problem. My bike is old school, it was my grandparents from over 50 years ago, and the tubes where I mounted my engine are too small for the engine fitting clamp and screws... so the entire engine can wiggle around. How can I secure the engine to the bike frame better? I have tightened the screws and nuts all the way but the bike frame tubes r just too small
 

gary55

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Nov 27, 2012
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3,273
Thanks for all the replies everyone, I am trying all your suggestions now. However I have ran into another problem. My bike is old school, it was my grandparents from over 50 years ago, and the tubes where I mounted my engine are too small for the engine fitting clamp and screws... so the entire engine can wiggle around. How can I secure the engine to the bike frame better? I have tightened the screws and nuts all the way but the bike frame tubes r just too small
I would split some metal tubing to shim out to a clampable OD.. PVC may last a while, but garden hose will get eaten quickly. Metal to metal is the best mount.
 
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Greg58

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Jun 3, 2012
Messages
238
Copper tubing can be used, EMT conduit is another choice. Make sure the rear mount is solid, if not you'll have a lot of problems. It sounds like a small diameter frame with a engine kit for a large frame. We used to have the reverse problem, about ten years ago all kits were designed for small frame tubes, bike tubing size has increased a lot since. If your kit came with a front mount adapter you may have to drill holes and use a smaller u-bolt.
 
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gary55

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Nov 27, 2012
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3,273
On the front mount you can you can make a adapter using a Muffler clamp that fits your down tube and some 3/16"
steel. I would still use the split metal tubing as a shim though. It protects the frame from pinch and vibration wear.
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