The maci at the shop told me it is the rev limited that causes it to back fire. Rejetting only sorts out the missing but you have to have it dyno tuned aswell.

 

Linz thats what i tought thanks but i put some ducktape on the holes and it still dose it when its in neutural and i hit the gas and it gose all the way forward whit out that screw in it backfiring and when im going down the road and let go of the gas it does it i dont undewr standwhy it dose cuz i put the tape on it so i figured that it would stop it didt so now im going to put jets and exhaust but i dont no if i should go with a full exhaust or a slip on
can any 1 help me it well be appericated i got like a mouth be for i can git one so i can do some research on them a little but as you can see not to smart cant spell good or read so i have been trying to do some research but i dont under stand a lot of what they are doing so that why i like being on this form