Originally Posted by
rippin_355
Well nothing wrong with running fresh 91 gas. Typically premium has no ethanol which is a good thing. Black smoke means excess fuel. Likely some crap in the carb causing it to run rich. Running without the air box would make it run a tad leaner if anything. I would have checked the compresion first and before buying it and would so that first before you spend anymore money on it. If that is ok then completely flush the tank, oil change, carb rebuild and check and adjust the valve clearance.
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