Leo, I would like to compliment you on your work, I have a TroyBilt, tiller, mower and 6,500 watt generator, all equipped with B&S engines, the 5HP tiller is a flathead, the mower a 6.5HP OHV and the Generator a 9HP slanted OHV that the specs say is all roller and ball bearings. High quality and easy starters all. Keep us posted on the evaluation.