Question about 2004 Derbi Senda SM 125 4T

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I have a derbi senda sm125 and when moving if i go above 5000rpm it starts jolting from the back wheel??? Any ideas what it could be?

Posted by zak_dando218 on

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1 Answer

Mark Tidwell

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Sounds like your chain is stretched and not fitting the sprocket properly or is just too loose. Check your front and rear chain sprockets for wear and ensure the teeth are straight. Check to insure the chain fits snuggly on the rear sprocket. As a chain stretches over its life, it won't fit in all of the teeth on the rear sprocket. This will cause the chain to ride up on the teeth at higher RPMs and jump (causing the feeling of a jolt or **** as it grabs again). Typically, the chain should have no more than an inch or so of play when properly adjusted.

Posted on Jun 22, 2011

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