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My dirt bike started making a loud screeching noise while in 1st and 2nd gears and when I push it when its not running and in neutral it also makes the noise. Also when its running and in neutral it does want to roll forward slightly. It seems to shift fine and never had to be forced or jammed up. The bike is a 1988 Yamaha YZ 250. The transmission oil is new and full. Any hints / ideas?