[spareparts]

Phnx, last time i checked, 2 stroke engines don't have cams, or valves with measured lifts. As far as measured hp, most two strokes are under rated, the SAE measured hp ratings used by outboard manufactures allow 10% varriance in the claimed hp ratings. Most of the big V6 2 strokes, by all manufactures excede the ratings on the cowl. I have personally seen 225 Opti's make 245-250 hp on the dyno. I've also seen 225 fourstokes barely make the 10% under. There is no accross the board statement other than each engine has to make within 10 % of the cowl sticker when new. Right now Yamaha could sell their 150 four stroke as a 175( it makes 165-170 hp, but they decided not to because they got there but kicked when they introduced the 225 four stroke( it barely made 205hp).