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Please clarify. Is this bike in neutral or engaged in a gear when you are trying to push it? Are you pulling on the hand lever when you do this pushing?What happens if you remove the spark plugs to avoid compression and then try to push?Something is amiss. If the bike is in neutral then there is no way that the rear wheel should be trying to rotate the motor regardless of clutch quality. If the bike is in gear, then yes, a cold, oiled up clutch might be sticky and might allow the rear wheel to rotate the motor. We need a little more information to determine the cause.Patrick HayesFremont CA
Perhaps the rear brake is seizing after it sits?
High humidity where you live? Could be rust related. I'd have that happen on my LM III if it sat too long on Oahu, Windward side. Minimum 70% humidity. Same bike now in 10% humidity on the Big Island.
Good question, nut it doesn't do it in neutral so I figured clutch/transmission
The main clutch issue I have with these bikes over the years has always been wear on the clutch drive hub. Makes it sticky feeling and grabby. Won't allow the plates to float when you pull in the clutch lever. Never actually ever wore out a clutch. Just tooth wear on the plates and hub always got me. When I put a new hub on the transmission shaft, I make sure to use a thin film of spline lube on the teeth.