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'77 GTMX / GT80 gearbox oil amount?

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Does anyone know the correct amount of oil to put in a '77 (or whatever year) GTMX / GT80?

I have the Yamaha dipstick, but it's weird; no markings, just a small square knob on the end. This dipstick showed oil on the knob after weeks of heavy leakage, but the kickstand was leaning the bike way over (it's fixed now). Right now the oil level is about 1/3 up the dipstick - maybe it's way overfilled?

Oil leaks from the clutch pushrod seal when the motor is running. The countershaft seal was just replaced, and doesn't leak at all.

Any info appreciated. If it were my bike I'd get a manual, but it isn't.

Ray

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I take it the oil capacity is not stamped on the case. My son's PW 80 takes 650 ml if that helps at all.

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My son's PW 80 takes 650 ml if that helps at all.

It does - thanks very much. I'll also check the case for oil capacity info.

Ray

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