Headstock clean-up

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Be careful if the ATF is thinner than the recommended gear oil. I had a motorcycle we pulled out of the dump and it ran with 30 minutes worth of work but the clutch was sticking so we put ATF in it. Well I got so happy riding it around I forgot to consider that the ATF was too thin and I eventually ate the gear box. Wasn't a big deal as "easy come, easy go" but it would have been nice to have that bike. It was an old Yamaha two stroke dual sport bike. I think it was a 200. I remember it was 2-stroke.