Re: vacumm leak???
Another place you'll want to check for leaks is the crankshaft seals. The magneto side is the most common to fail. The factory sometimes doesn't get the seal pressed in as far as it is supposed to go and the magnet rubs it and screws it up. Spray around the mag cover and where the wires exit the case. You'll see the difference in rpm if that seal is bad.
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