done the carb o rings, new plugs etc now when i try and start the bike it turns over ok then gives out the biggest bang ive ever heard with a big flame out the exhaust! one time i was turning it over then left it for like 4 seconds and it done another huge backfire without me even touching the bike?? im getting sick of the hastle and want to race it in the next few weeks any ideas whats wrong?

also would a set of gsxr 600 carbs fit?

Are you sure the low tension wires are going to the correct coils and have you got the ht leads to the correct plugs?

left hand coil supplying 1 and 4 and other 2 and 3 plugs etc all new and sparks great on all
whats the low tension wires and how would i test if the right one is on the right side etc?

thanks