You have coolant in the radiator, and the fan comes on after riding 10 minutes or so, correct?
It could be a bad crankcase seal, or some type of air leak into the crankcase, or intake manifold air leak.
Jon Stoodley (jse) is a good source of trouble shooting info. He hangs out at the site below and often answers questions:
http://www.trialscentral.com/forums/forum/7-gas-gas/And he has a lot of tech info at this site:
http://www.gasgas.com/tech.htmJim Snell (or his staff) is a good source as well.
I have a 2002 GG 280 Edition (that runs well). I also have a compression tester that you can borrow. You are welcome to bring your bike by and we can do some trouble shooting. I live about 20 minutes North of Milwaukee, in Mequon. I will send you a P.M.
Dave
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