I always let the bike warm up to past 100 f... but until it is completely warm, 160+ it will back fire if I let off the gas at or above 6k rpms. Theres a slight hesitation usually, feels like the bike has to catch up with itself. Off hand anyone have any ideas? I have another set of plugs here and i need to get an air filter, but its getting closer and closer to winter, I'm trying to wait.

Thanks,

Rob

 

you be running rich during that time.

 

Any modifications to exhaust or fuel system, how many miles, last service performed??