Jacob Braun· Registered
Discussion Starter · #1 ·
I have a 400ex that's backfiring on deceleration. Initially i thought it might be running lean but then I noticed it blowing a bit of black smoke on full throttle. This made me think it's rich. The backfiring isn't very bad but its definitely noticable. I also noticed it bogging a little in second on low throttle. I looked at the jetting and it's running a 165 main, I didn't check the pilot. It also seems to bog down/stutter at full throttle. I'm running no airbox lid, stock air filter and a yoshimura exhaust (the exhaust pipe is cut down shorter, old owner). Not sure if the header pipe is stock or not. Anybody know if it sounds to be lean or rich?