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I was given a mower after it hit a large root and wouldn’t start any more. I have already: -replaced the flywheel key -Straightened the driveshaft (following Steve’s small engine saloon) -emptied/cleaned gas tank and fuel line -added fuel -checked oil -Disassembled carb and cleaned with...

I bought a new mower with a B&S 750EX engine. Used it about 1.5 hrs on low throttle (thought I would save gas). Then the engine started surging. I looked at the spark plug and it was covered in soot. I changed the spark plug and it is still surging. Does this sound like a mechanical issue...