got a 06 trx 450 er..boyeson qickshot, big gun, dyno, uni bike revs to high rpms and then backfires...any ideas

 

Does it backfire after letting off the throttle from high revs? If so, increase your idle mixture (more rich). This will take care of the backfires. Continue to increase mixture a quarter turn until no more backfires.

 

I WISH BUT THE PROBLEM IS A LITTLE MORE COMPLEX THAN THAT..COULD NOT AJUSTING THE VALVES HAVE ANYTHING TO DO WITH IT