Vintage Dirt Bike Q & A

Dogger,

From what I gather, the problem stems from the sidecase. The impeller & the impeller cover do not corrode. It is the case that is the problem. To reverse engineer the sidecase is possable, I am sure, but probably out of reach financially for most.

ANY H2O in the system (distilled, treated or otherwise) will cause corrosion. You have to run a waterless liquid in the system, or coat (as you suggested) the water pump area with some kind of flowable substance.

I for one use the above mentioned Evans NPG coolant http://www.evanscooling.com/ . End of corrosion problem.

If you decide to reverse engineer the case, I would be interested in one... unless I would need to take out a bank loan !

Has ( is) anybody else using Evans NPG? I am curious.

Keep the comments coming. There is strength in numbers.

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83 CR250
83 CR480
87 YZ250
88 CR250
74 TY250
07 YZ250
83 RM250 on the resto table
91 YZ250 with an Ohlins 360 kit in resto que
83 CR125 in resto que