Greasyrider
Husqvarna
AA Class
I am back on a 75 CR250 after it was sold to a friend 35 years ago and then re-acquired by me. My friend let it set for decades at a time - only buying a new air filter and firing it up once every 15 years or so. I have got the bugs out of it (literally) and have started racing Enduros in the EVO class. Only thing is that i change the oil about every 3 hours running time and it is always gray and sludgy. I use Castol GTX 20/50 - which is what i think I used back in the 80s. I seem to remember doing oil changes back then and the oil coming out fairly clean after use. I kind of expected nasty oil the first few changes, but this is about the 5th and it is still quite nasty. The bike runs and shifts like new - just concerned that something is going on. Any thoughts or insights?