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Your bike should go into gear whether the clutch is working or not (not that you would want to jam it in gear with the engine running). Oil change has nothing to do with clutch operation. Recheck your cable installation something is not right.

The timing won't be in a position to be adjusted. verify for spark on the spark plugs. If the plugs hearth, don't be involved by electric problems. depending on how long the bike has sat devoid of being run, the main user-friendly issue could be clogged jets in the carbs. sparkling the carbs - fairly the pilot jets.