Maintenance & Technical > KX250 / KX125
2-Stroke engine oil?
Charlie500:
i use belray h1r at 40:1. never had any problems with it. I've been riding kx 500's for 13 years now.... before h1r came out i was using belray mc1...
i also use the belray gear oil for the tranny
coalpilot:
I use Motorex crosspower 2T @ 44:1 . This is recommended by KTM for their 2T bikes. Seems to work great for me, My sons 04 KX250 is still on it's original piston and rings!!!!! and yes, he races it. I also like Rock Oil. I use ATF type F in the trans, changing it every other race. Shifts like butter, clutches last a long time...and no sticking or chatter.
RoostDaddy:
I too like to run the Motorex pre-mix. Works great, but as for the ATF in the trans. It is designed for just that, automatic transmissions for your car. Wont be seeing me use that. Read up on it and many others will tell you about their experience.
alward25:
Not long after getting my 500 I read on this forum about type F and gave it a try. It seemed fine until a few long high speed runs and it started blowing out the countershaft sprocket seal. It was apparently foaming and needed an escape. It might do well on the clutch but I feel the rest of the system requires more lube. I run 25w50 Amsoil motorcycle oil. After a lot of high speed running and not a drop lost, I am going to stay with an oil like that. I ran Royal Purple same weight for funnzies with same result.
I might give jet engine oil a try because I can too......
Run what works for you. We all have different styles of riding. The same oil might not be the only solution for all riding situations. When in doubt, run what the factory says.
I don't, but you could. :wink:
coalpilot:
...It was apparently foaming and needed an escape...Your trans case is not vented??? I rarely do flat out long high speed runs. For what and how I ride, it works, but as was said, your needs may require different. In the heat of the summer I use motorex 75W tranny oil. No mater what you use, change it often, there are no filters in there.
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