hi fonty cheers for the info i think i will be going for the 28 simply for the fact that it is the latest engine but if a 21 engine pops up i may use that. i know this sounds a bit strange but the bike i want to build will be a sort of concept along the lines of aprilias sxv supermoto bikes except my bike will probly be some sort of cr/crf frame adapted to take an nsr 250 engine, i was just wondering what you guys thought of my idea of an nsr250/300 supermoto/crosser?

cheers juan...