Ok so my bike is backfiring on accel and decel. Also, it is hard to start, no idle adjustment and fuel mixture screw quarter turn out to start. When I bought bike it would only run with choke on. Changed jets with no luck so cleaned and bought another parts carb to create one good carb. Put all stock mains and pilots in after rebuild. Put carb on but now only starts with choke on, and if I keep it revved it will run with the choke off. Did the mixture screw check with only a noticeable bog down about 3 turns out. Took valve cover off to confirm timing chain and left can gear was off a tooth. Adjusted but now not sure if I should try and start or adjusts jets too while apart? Any suggestions?