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What transmission oil should I run in my 99 rm125

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Just wondering what kind of transmission oil I should run. 1999 RM 125. Just bought it and putting new oil in it.

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Your're likely to get as many answers as they're species of plants. I personally use ATF in my gear boxes on 2 and 4-strokes. But really like it in my 2-strokes. It makes for great shifting and clutch fanning recovery on 2-strokes.

Edited by WALKINGWOUNDED

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Never tried the ATF, but I run AMSOIL 10w40 in all my race bikes. Would the ATF cause less drag in the trans to pick up alittle HP??

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i have a 2002 rm 250 just rebuilt and i am going to put in castrol 10 w 30 for the first time was told by old school racer on 500s back in the day that was the best

have my doubts what do u all think

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i have a 2002 rm 250 just rebuilt and i am going to put in castrol 10 w 30 for the first time was told by old school racer on 500s back in the day that was the best

have my doubts what do u all think

The best is whatever you like best.

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In my old 99 rm 125 I switched to ATF when I bought it and found that it made for smoother clutch operation. It's cheap too so you can afford to change it often.

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Walmart ATF... We've run type F for thousands of moto hours... Anything more expensive is a waste of money IMOP!

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Doesn't it have to be JASO-MA certified for wet clutch? This is why I run Rotella 15-40 in all my stuff.

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I've found that the

Pro Honda HP Transmission Oil

performed best in 2 stroke gear boxes. When you pour it in it looks similar to ATF, but you have piece of mind, knowing it is spec'd for MX bike transmissions. I've also used the Bel-Ray 80wt Gear Saver with no complaints, but found the clutch action to be lighter with Honda, but that just could be it was more broken by the time I changed to the Honda stuff...

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I'm no oil chemist, but from my understanding, the thicknes of the fluid is only part of the protection, but the ability of the fluid to "shear" the friction of the gears contact under a load is important too. Some of the turbo European cars I work on use ATF in the stick/standard transmissions. The fluid in these cars stays cleaner longer than a bike because there are no cluthces to wear and contaminate the fluid. As someone above mentioned, I got many hours on gear boxes with no problems. It's cheap enough to change it every week.

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