RM250G engine
 

I have a RM250G 1986 crosser, when i got it the guy was beside himself with frustration. now i know why.
it was taken into a shop because oil and water was mixing, they said they replaced some oil seals, but we had a lot of trouble even starting it. i stripped the head down and got it running, and the oil and water was mixing again after about 5 minutes. is this terminal? any suggestions? some time ago,the engine wasbored out and a racing piston fitted, butwas used after this with no problems, until this latest issue.

Please help

RE: RM250G engine
 

I had a 1990 RM 125 that had its oil and water mixed and the local dealer told me it's probably a water to oil seal on the water pump shaft or right behind where the water pump is. i noticed my problem when i did an oil change and i had chocolate milk colored oil come out it eventually caused my transmission to go.