Was on a ride yesterday. I wanted to get some more time on my 03 WR450. I want to thank all who helped with jetting and set up. Bike ran great. I noticed a noise in the motor on hard accelartion. This was on the way back to the truck. I took it easy going back, when the bike started to shoot white smoke out the muffler. Bummer, I suspect a head gasket. Back to tearing it down. At least the motor runs and shifts good. I suspect coolant was getting into the cylinder on hard accelartion causing the noise. Piston coming up on compression stroke trying to ignite coolant. And coolant can be compressed. After tear down I'll post what I found.