ok here goes, after doing the stage 3 mod last year My bike will backfire on decel. Usually its just if i am in a low gear or something but it shoots about a 5 foot flame. This is not only embarrassing but I think it could potentially harm the engine flaming like that lol. My bike is Bone stock. never touched the carb at all, factory airbox, factory pipes stage 3 modded(gutted). I'm guessing the answer is to adjust the pms screw a touch but I know nothing about carbs. I'm scared to death to touch it lol. I know that I will probably have to drill out the cover over the pms right? now supposing I was under the carb on the bike, which way would I turn the screw and how much would I turn it. would I turn it in or out. Its not that big of a problem but it scares the daylights out of a buddy of mine that rides behind me lol. Giant flames are not fun in the dark for tailgaters.