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Idle knock, backfires

jcoop86

CB750 Member
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Hey guys, I just picked up and 81 750f and I am having some running issues. I have a knock from the lower left of the crankcase at idle but goes away completely after 1500-2000 rpm, also my #1 exhaust pipe is getting heat coloring and I'm getting an exhaust backfire from either #3 or #4. There are also very small intake backfires but can't tell which carb it's coming from. Carbs have a full rebuild on them and I trust the guy who did the rebuild. Very smart man when it comes to these bikes. Carbs defiantly need synced. Is there anything else I should look for after I sync the carbs or even before
 
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