Well I got to find out this past weekend how tough these motors are. I had a race Sunday at the local track, mind you I race Harescrambles. I was working on the bike Saturday night and have a local neighbor kid(about 10yrs old) that loves to help me. With winter here I was changing out the water/antifreeze out and placing new in. So I drained it, and explained how fill it up and put the cap back on to him. Leaving him to do it while I was doing something else. So I get to the race ran practice and instead of doing my normal checks before the race I relaxed a little. The course was almost 6 miles long. It was a great course. Race starts and with a first turn crash in front of me I am relegated to last place, my buddy is in front of me. So we hook up and start working our way through the class. We work our way up to front(so I have been told top 5) when on the fifth lap I started to notice a little chugging at times. It only got worse as the next two laps wore on. I was going from 3/4 gear to 1/2 and no power. Well I am about half way into my 8th lap when I had to stop. Big ball of smoke coming out of the exhaust. I sit for about 10 minutes fire her up and ride it back to the pits. I crack open the radiator to find her dry. I added engine ice and water. Made a call to the neighbor to find out he didn't put anything in the engine. When she got filled up there was oil or something else that came out, so I am pretty sure the head gasket is shot, but will know more when I pull the head. But she ran a total of 50 miles without a drop of coolant at race pace(average speed was 22mph, gotta love those trailtech computers, LOL) On that note anyone know of a good place beside Eric Gore for top end work? As I know I will need to replace atleast the valve springs and seals for the head.