Hi, I had a ยด75 KH400, they go like hell in a straight line, but you will have to slow down and apply some muscle to make a tight radius turn w/ any rate of speed above a crawl. The 400 is easier to handle than the 500, or 750 triples through. Cheers. (P.S., make sure you keep the oil injection metering ajusted periodically, or the middle cylider will burn out rather quickly..learned this one the hard way...=;-).