Transmission Oil Service

[iyaoyas]

...would like to replace the transmission/crankcase oil in a '72 6-Day (Sachs engine) and Jackpiner (KTM engine). Can anyone tell me what the preferred oil and oil viscosity are?  Hopefully it is the same specification for both engines...

Thanks-

[tofriedel]

ATF works for both bikes.

Tony

[Larry Perkins]

I like Belray Gearsaver.  The non-hypoid kind.  More expensive but does not have to be changed as quickly.  Both are very good, though.  Just my preference.

Larry P

[dirtbike]

ATF Dextron III oil will serve excellent in both bikes. It has been a long time since I poured anything else into an engine. And it will likely never happen again.

[iyaoyas]

Thank you to all who replied...one more question though...Any preference for draining the oil through the drain plug or by removing the clutch cover?

[Randy Kirkbride]

You better remove the clutch cover to drain the oil or you could easily strip out the drain plug.

[Lew Mayer]

Plus you can clean out any sediment better with the cover off.

Lew Mayer

[iyaoyas]

Should I remove the clutch cover on the KTM engine as well or only the Sachs engine?

Thanks-

[Larry Perkins]

I myself, don't find it necessary to do that on the KTM motors.  Just the Sachs.  The KTM motor drains from the ignition side, NOT underneath.

Larry P

[iyaoyas]

Thank you Larry and to all who have submitted their advice.

-Stephen