the last few weeks I've had an issue with the engine back firing when reving up the engine in the garage. It only seems to back fire out the left side header and I dont notice it back firing while racing....
Ive replaced plugs and checked valves (most were a little tight). Still back firing but maybe not quite as bad as it was. Its never been a huge back fire but still has my attention to what could be causing it.
Any info would be great....
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