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Hi, i got a 02 800 xcsp, and ever since i put the new upgraded power valves in, its been very boggy on the low end and mid range also. its not as quick as it used to be and it backfires every time i slow down and let it idle. BUt when i start it up, it will be fine until i press the gas, we raised the idle up on it and it didnt do anything different, except it will idle now and it didnt before.

The mods are slp single pipe, slp airbox, v force 3 reeds, holtz vari flow, and thats about it i believe, so whats the deal, is it electrical? is it the power valves? i have the green/yellow springs in there now, should i change those out? help!!!
 

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Check your bellows?

Maybe they got torn or came unseated or something during the insulation.
 
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