Word, If he can make the bottom end trail friendly(ish), and keep my top, im sending the cylinders to him ASAP.
Like said, if it is big wide open high speed trails, you MAY be ok with the cub, but i think the stock cylinder would be the way to go. My bike pretty much blows on tight winding trail situations in the sand. the dirt would be even worse. You go from nothing to spinning the shit out of the tires squirrley in about .0002 seconds.