Honestlly, if a builder told me that kind of crap, I'd be finding another one real quick. A banshee's motor needs to cool better, especially with porting, pipes, cub and other mods we do. That's why the aftermarket has cool heads, better impellers, larger radiators, Nikasil plated cylinders, and special coolants to combat heat. Anyone tells you that dissipating heat quicker is a bad thing, you tell them to go jump off a cliff. That has to be one of the lamest reasons for not to use a nakisil plated cylinder I've ever heard, really it's the only one. Cubs make outstanding dune motors. I've had every level of modification inbetween from stock cylinder to a 4mil cub and the cub is the best dune motor I've ever ridden bar none!! You tell your builder to find a tree with better shade cause the sun has fried his brain.