185 mikuni, dyno jet needle on 5th noth, 4 turns out...on my grizz and still running lean. Popping and backfiring on decelleration. I'm at sea level. I have an hmf full system and a kn air filter. What else can i do or try to solve this problem?

 

If you dont have intake or exhaust leaks, then go one up on the pilot jet.