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It might just be wear on the pinion and ring gears. The best way to make sure what's happening is to remove the flywheel cover & inspect parts. -Is the bevel gone from the leading (left or outside end) of the pinion gear's teeth? -Are there two places on the ring gear where teeth are worn badly and do they have flat instead of beveled leading ends on the right or crank case end of the teeth? This can be solved (some times) by removing the gear, turning it a quarter turn & re-instaling it. Rather pointless if the pinion is in the same condition. Best to just replace 'em both if possible. -Does the pinion slide smoothly and easily on the drive shaft without activating the clutch half of the toggle mechanism until it is at the fully engaged position? -Is the toggle return spring intact and doing its job? If it broke & somebody reattached it's anchor end to the wrong location, the toggle won't work right. -Start the pony. The pinion gear should NOT roll until well after it is fully engaged with the flywheel and the second stage of the toggle is operated by the operating handle. Keep clear, safety first! Best to make the whole gammut of adjustments per the shop manual on these. Later. Good luck.
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