jeting ?

[bigstorm]

hey i just got my 06 yfz 450 done i threw on a pro cicuit slip on. and i rode it for a lil bit and the things starts pouring cooland from the over flow. i dont get it ive tried changing jets. but it still does it for some reason/ i was told the reason that iw was doing it was because it was jetted way to lean. but i dunno

but any help would be appreciated

-storm

[GSX]

Have you pu an aftermarket piston in it? It sounds like you have a blown head gasket.