I know this has been beaten to death but wanted to make sure, If it backfired out the exhasut is it lean or rich., I have the 06 750 brute stock jetting, Dyna cdi,Twin air filter, ride from 6000' and up.
Also is the screw in the bottom air screw of fuel screw, I know some carbs like my snowmobile has both.
thanks

It was doing this before the filter and cdi install

 

Just to clearify and to be politically correct, there is backfiring and afterfiring.
Backfiring is firing back through the intake and carb (too lean).
Afterfiring is firing after the combustion chamber (through the exhaust).
Afterfiring is caused by unburnt fuel (too rich) that is ignighted in the exhaust system.

 

It is coming out the exhaust forsure, I thought if anything it had to be to rich, IT jetted stock and im riding at 6000 plus.
Ill spend a little time today playing with it
thanks

 

You are definatley running rich. These machines are jetted for sea level not for your kind of elevation.