Oil and OCI for a 2 stroke dirtbike?

[Huhwhye]

I just bought a 2000 CR500.

How often are you guys changing your crankcase oil? I figured often, but how often? And what are you using for oil? I was thinking Rotella T.

 

[Mackelroy]

the 15w40 stuff will work , you cant't dump it too often. I went almost 5 years on orginal clutch, still perfect when I sold it. Dumped oil about every other weekend.

 

[Jaybird]

I use Type F ATF in all of my 2-stroke applications.

Changing frequently is the only way to go. I like to change out every ride or two, depending on how hard and long. Another plus for the $.79 qt. Type F.

If ATF make you nervous (understandable)I would suggest using any Xw40/50, but you may see some surge, as these oils are a bit more viscous than ATF, especially in cold weather.

Congrats on your purchase..that is quite a beast you have there...HOLD ON!

I say go for the Rotella if that suits you. It is a very robust fluid, and economical.

Many bikes will act differently with different fluids. Being yur bike is used, and you don;t know what the previous owner used, it may take some experimentation to find "what the bike likes".

 

[tmorris1]

You are changing the transmission oil, not the crankcase oil in that bike. It is a 2 stroke. I always used a 10W40 or 20W50 in my 2 stroke bike. That was a few years ago and the oils have changed since then.
I agree with Jaybird, try it and see how your clutch feels. Oil has a big effect on clutch and shift feel.

 

[Jaybird]

Mr Morris is correct, the crank is protected from wear by the residual 2-cycle oil that has dropped out of suspension from the fuel.

Transmission and clutch are what we are reffering to in a two-cycle sump.

I'm sure you were reffering to the oil sump, and many use the mistaken term 'crankcase' often.

 

[Cujet]

I have found that Mobil 1 ATF works really well as a 2 stroke trans oil. I have an older RZ350 I restored. It really responded well to the M1 synthetic ATF. The shifting improved quite a bit. The trans fluids I replaced were motorcycle specific 2 stroke trans oil.

My 94 Husky 360 dirtbike also really likes the M1 ATF. The Husky comes apart fairly often for crankshaft replacement, and I do not have any bearing, clutch or gear wear issues with the M1.

I use Mobil 1 MX2t (now racing 2t) with great results also.

Chris