Join Date: Sep 2008
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If the chain was loose it would be more likely to jump upon downshifting. The fact that it jumps is the ECM wanting to "go go go" because thats how the bike is built to ride. Kinda hard to explain but there is a throttle postion sensor on every make of ever kind of computer driven vehical to maintain throttle postion for the proper fuel are mixture at the throttle body. Thats whats jumping back and forth most likely.
However if is a major "jump" that could cause you to lose control you need to take it to a shop to be looked at, because you could have computer problem that in the best case will just need to be reset.
Oh another thing that just popped in my head is some people forget that your chain is not the only thing that can have "lag". Your throttle cable can too. With that being said the throttle cable and the tension on it could be wearing leading you to have to maintain a more controlled grip on the throttle than say a new bike where you may only have to apply set tension from the palm.
Just a thought plus brainstorming your issue. Hope it helped.
-I got two guns one for each of yah'-