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so far so good i think i solve my problem, on the 0% throttle on my PC5 i remove -5 from 12000 rpm to 7250 rpm and -10 from 7000 rpm to 5000 rpm and no more backfire :)

Stamos - my bike backfire when i pass 9000 rpm and i close throttle on decel. Dicko - not properly tuned, i have try the maps found on this site... were should i had fuel on the PC5? in the 0% throttle? only backfire when the throttle is fully close on decel when i get around 5-6000 rpm...

Need some help to find a solution, i gutted the header and the muffler at the end of summer last year, remove AIS and put block off plate, ad PC5, BMC air filter and 16t front sprocket. the bike run great but when i pass 9000 rpm it backfire on decel ( large pow! ) and i can't stand it and need...

When i did the block off plate i checked the spark plug and by the color it was lean so i am gone a buy a PCV asap... and maybe go with the ECU flash later. Were can y find a good map for my mods?

there in the same catalytic material that is in the header in the stock muffler, it take a 18" drill bit, a chisel and lot of patient to take it out, but when done it have less exhaust restriction and should gave couple HP in mid range and keep stock muffler.

I Have a 2007 FZ1 and done a couple mod and now i have backfire pass 9000 rpm when i cut the throttle. Mod are: - Bmc air filter - 16t front sproket - gutted headers - gutted stock pipe - ais block off plates My question is, will...