Hi! My son recently got a 99 Blaster. It has a Pro Circuit full pipe, Vforce 4 reed assy, pre-mix, 155lbs compression, airbox lid removed, K&N air filter, timing advanced, 93 octane 32:1, jetted with a 290 main, and plug chop looks great with the help of some amazing people on this forum. My issue is that at very low throttle in any gear it makes a sort of banging sound and what I call "bucks". It just wants to go faster or slower, not maintain a slow speed This Blaster idles perfect and revs flawlessly throughout the entire RPM range. I can't figure it out! It only happens at about 1/8 throttle in gear. Also did a pressure test that it passed as well. Can anyone think of anything to check that I might have missed, short of pulling the engine apart? Could this possibly be a timing issue? It runs incredibly well other than about 1/8 throttle..