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Instructions for Building and Repairing Motorized Bicycle Engine Kits Classic posts on building, repairing and modifications.

 
 
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Old 03-13-2009, 09:31 PM
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2door 2door is offline
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Default Motorized Bicycle Chain Noise

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 interference 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 marks 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 loose...no, they're not.
Tom
Attached Images
File Type: jpg Clutch, 1.JPG (104.1 KB, 2457 views)
File Type: jpg Clutch, 3.JPG (102.3 KB, 2198 views)
File Type: jpg Clutch, 5.JPG (124.2 KB, 2137 views)
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Last edited by 2door; 04-02-2012 at 06:58 PM.
 

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