I own a 2005 200 HP Yam 4 stroker. When I study the specs on the 200, 225 and 250 (non VVT) all the bore, stroke and weights seem equal. How is the additional power being produced? My 200 with a Yamaha SS Saltwater 15 3/4 by 16 on a 225 Grady Seafarer seems to perform almost the same as a similiar proped 250 on that same boat??
