bad backfiring on start up 83 xt 550
Hello guys my bike is a 1983 xt 550 runs great lots of power but on cold start ups bike is hard to start and u have to hold throttle open with full choke throttle half open for about 30 secs to a minute and it backfires threw airbox and exhaust (loud) then u can release throttle and choke then it runs good idels good but backfires when letting go of throttle does anyone no i cleaned carbs new aiflilter checked for vac leaks adjusted valves and recently replaced timing chain thanks for your help guys
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