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Old 03-14-2009, 07:42 AM
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Retmachinist Retmachinist is offline
Motorized Bicycle Elite Member
Join Date: Oct 2008
Location: Urbandale Ia
Posts: 637
Default re: Motorized Bicycle Chain Noise

Originally Posted by 2door View Post
There has been a lot of discussion about clutch/chain noise from the 2 stroke Chinese engine. I've found one source that anyone with a Dremel tool or a grinding stone in a drill can cure. Both of my engines, one from Dax, the other a Chris Hill motor, had chain inerference with the clutch actuator cover. The photos show where I found the chain was hitting inside the cover and what I did to eliminate the contact. After this modification my clutch/chain noise was dramatically reduced. It's easy. Give it a try.
Remove the clutch actuator cover, look for the telltale markes on the inside of the cover where the chain has been hitting. (photo 1) I used a Dremel tool with a sanding drum but any abrasive tool will suffice, to remove enough material to widen the space between the cover and the chain. After grinding the relief area I installed the cover and spun the rear wheel with the clutch dis-engaged, and looked for any spots that were still hitting and then ground off just a little more material.
The attached photos are self explanatory. Any questions, just ask.
Oh, and before you tell me my chains are too, they're not.

Tom, I had noticed the same marks on all of my chain covers. They all made a quick trip to the mill where that was eliminated. Good Find!