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it is, but doesn't show any signs of stress so i thought it was supposed to be slightly curved

no evidence of that

the bottom of the piston is contacting the counterweights on the crankshaft. with the piston removed, I can grab the connecting rod and everything rotates smoothly. wtf?

my bg56c piston won't rotate beyond bdc unless i spin the flywheel in the opposite direction where it stops at bdc again. i put a new carb on because gas in the muffler and difficulty pulling the rope without wrist injury. is it worth fixing?