Can you feel the grooves with your fingernail? If yes, you need re-boring the cylinder and a new piston. Plus, the color of the oil is caused by the fact that some water got into your oil. If you didnt run your bike in a river in the last days, (...) you got anti-freeze into your oil, caused by a bad head gasket/seal and/or a bad crankcase gasket. Also, i would check the condition of the water pump and its bearing. You need a complete restoration of your engine, i just posted a new thread on a restoration of my 1992 rm 250. It works just the same. Im gonna post videos of the complete restoration of the engine including the transmission ( its already appart, just need to take it back together). Hopefully, clear enough so people can understand how to do it themself.
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