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I have 1999 zx6r, i recently changed my spark plugs on my bike and when i took it for a ride I got alot of backfiring when decelerating, and when i accelerate it will backfire sometimes but not alot. I know its normal for the popping when decelerating to happen, which it always did, but not near as much as it does now since I changed the spark plugs. I checked the plugs and the wires, all are good. So whats the issue? Any help will be greatly appreciated
 

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If the only thing that changed were the plugs, I'd guess you only have three firing..... the rich charge from the one that isn't is making it into the exhaust and is detonating there. All bets are off, if you disturbed anything else.
 
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