Im looking into taking my spare motor(bone stock) and doing a 4 mil serval it would be a dedicated dune bike with a balance of trail,dune, and drag im thinking of using the serval cylinders because I hear they have a lot more low to mid range power than say a cub bike. any input on a better cylinder, who does a good port for one advice in general would be greatly appreciated. have 28mm flatslides and t5 for the bike. would like to have something making 70+ usable hp on gas let me know what you think, thanks, Zack