Hey guys I plan on building a motor from ground up but I just don't know what jugs and porting to do. I want to do a 4mm. I want it fast. Fast to where I can eat some modded 450s and some other 4mill banshees at the dunes but, also be a dune bike that I can fly around on. It won't see and woods or trails. It will see open fields and mainly sand dunes. I had in mind a 421 cub but that's just from a little research. Thanks guys.
Chris