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so in 2nd gear i bring the revs up to 6-7k and let off the throttle and as the revs hit 4k it pops and back fires. good or bad? i think it sounds cool but i dont remember the fz1 doing that
 

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Backfires are usually caused by an airleak in the exhaust tat allows oxygen into the exhaust near the head or inlet of the collector.

Clean the scrotum with Barkeeper's Friend, found in the household cleaner's aisle.
 
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Sounds like Akrapovic carbon, I could not remove that 4k PoP for the life of me in fuel map, have to get Vcyclenut flash to turn off the decel cut from injectors via ecu.

Kaiser
 

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Sounds like Akrapovic carbon, I could not remove that 4k PoP for the life of me in fuel map, have to get Vcyclenut flash to turn off the decel cut from injectors via ecu.

Kaiser
Its not the fuel cut that causes the decell popping....you need to turn of the AIS system with a flash, or install block off plates....
 
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