I finally convinced my brother to give me his 2000 TRX 400EX that has been sitting in his garage with a blown head gasket for at least 3 years. He's sure it's got a blown head gasket and a 440 kit in it. I am thinking I will probably replace the whole top end with a new 440 kit (cylinder, 11:1 piston, gaskets, ect) so I don't have to worry about cracks in bad cylinder walls / sleeve installation. Hopefully it also has some other work done so that I don't have to get everything it needs to scream ie. jetting, air filter and pipe.
My Question is what else should I look out for, test, clean or replace (beside the air filter) for a bike that has been sitting this long? I'm mostly concerend with motor stuff, shocks and breaks can come later. It's been pretty well protected because it's been in a garage this whole time.

Thanks for your help, lovin' the forum!

 

The main problem is that the carb is probably full of varnish. It needs to be taken apart and cleaned.