Jerry, while your here, what is a good piston for high compression/high rev 250s and 500s? I always had good luck with vertex black coated pistons in high revving 125cc bikes. They don't list them on vertex's site for the LT250. When I was wrenching on 80s 100s and 125s they made a high compression piston for stock bore bikes that didn't require any machine work. They were awesome in my YZ125. Does anyone make a similar piston for our applications? if not, have you ever applied the black moly coating on any of your builds?