idk the comp #'s, but i do know that for a few years they had problems with loose valve seats. Ive had 3 motors that i junked because of this and they were only 2 years old. 1 reason i will never buy anything with the b&s name on it.......junk...i did reseat the first one that went bad, but that only bought me 2 more days before that 1 failed. there 5hp motors have never ever given me a single problem other then burning some oil. Still have a few 5hp 25 year old motors on some equipment that work good. They just dont hold a candle to a honda or kawi motor. pulling the head on the 8hp motor is simple and worth looking into. a bad valve seat will prevent the motor from starting.