backfiring out one side and not idleing

[chappy]

Well I just put new pistons in(stock bore) removed the air box and put on a toomey 2into1 air filter setup,and LRD exhaust.I put in 330 main jets and needle clip on the middle clip with stock pilot and 2 turns out on the air screw.While I had it apart I removed the TORS box and cut the wires from the carbs and the thumb throttle a,d installed new plugs and fresh gas.It started up after 3 kicks and idled fine just smoked a lot but it was probably just the assembly lube burning off the piston.After it warmed up it pretty much quit smoking and would not idle any more.I had to pull the choke out to get it to start and it would only run if you gave it 1/4 throttle or more and if you lightly rev it it backfires and blows a blue flame out the left tailpipe only.Choke tube is on and I can't think of anything else it would be.

[KHall]

Well I just put new pistons in(stock bore) removed the air box and put on a toomey 2into1 air filter setup,and LRD exhaust.I put in 330 main jets and needle clip on the middle clip with stock pilot and 2 turns out on the air screw.While I had it apart I removed the TORS box and cut the wires from the carbs and the thumb throttle a,d installed new plugs and fresh gas.It started up after 3 kicks and idled fine just smoked a lot but it was probably just the assembly lube burning off the piston.After it warmed up it pretty much quit smoking and would not idle any more.I had to pull the choke out to get it to start and it would only run if you gave it 1/4 throttle or more and if you lightly rev it it backfires and blows a blue flame out the left tailpipe only.Choke tube is on and I can't think of anything else it would be.

Mine did the same thing when i put my top end back on and 1 of the carb slides was hung wide open I took the slide back out cleaned it put it back on and it ran like a champ and idoled

[KHall]

By the way the piston is installed the right way cuz that will cause it to back fire 2 the arrow to the exausht

[WS6Drop]

I had the same thing happening with mine and found out that the left carb was way out of sync with the right. I tightnened everything down and synced the carbs and it ran fine.