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1991 evo back fires .

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Old Jul 15, 2022 | 01:19 AM
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Default 1991 evo back fires .

My 1991 FXSTS just started bacfireing today . at idle if I give it a quick twist of the throlle it spits fire out the ccarb( air cleaner removed) and now as I cruise at huighway speeds and let off the throttle it gives a series of back fires through the exhuast . Could the VOES have anythuing to do with it ? I checked the intake for leaks , blew the slow,and main carb jets out and dont know what to check next ..I haad changed nothing , my good accting buike suddenly is back fireinng ..
 
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Old Jul 15, 2022 | 02:09 AM
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I suggest doing a compression test to rule out a possible intake valve as a cause.
 

Last edited by IronAss; Jul 15, 2022 at 02:14 AM.
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