Possibly the firing order got messed up.
Backfiring in any motor is either badly out of time or a burnt valve.
Timing is off.
Too Lean. Bump up fuel pressure.
I have a problem. I just bought a used 1995 Kawasaki 220 Bayou. The engine started running a little rough at first. Kept getting worse and then started backfiring through the exhaust. I had the carbeurator rebuilt but still runs rough and backfires. Cranks good and idles good. What could be my problem? Thanks
Check the IAC (Idle Air Control) valve on the back of the Throttle body http://www.youtube.com/watch?v=gHjl6BWp6j4
Well a lot,first be sure the wires are in good shape, replaced the plugs,do a tune up.
Buy a Chevy :)
yes, backfiring is always due to ignition or timing problems. Backfiring through the carb can be a symptom of a lean condition.
Check that the distributor wiring is right ( 1-8-4-3-6-5-7-2) Most common problem is criss-crossing the no. 5 and no. 7 plug wires
Your ignition timing needs to be adjusted.
Its fuel injected doesnt have a carb.
I had one do that and it was caused by a bad intake valve.