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Greetings....Finally got the Twin running, but have a backfire on both accel and decel. Someone told me it was valve clearance. Would this be intake or exhaust. Plugs are brand new, and from recent responses on an older post, the timing cannot be changed, so this must not be the root cause. Any help or comments would be appreciated. Thanks

Rich
 

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Backfire

Do a quick compression check, remember Wide OPEN THROTTLE WHEN YOU are cranking it over for a valid reading...Even before that...what do the plugs say? to lean? IF it is running to lean, it will also backfire...think the compression check is in order...anyway...get back to us...
 
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