Re: 25 hp merc soup up ??
In general, the easiest way to "hop up" a motor that has a larger sibling in a family of motors (same bore, stroke, etc.) is to find a blown up version of the same motor and bring over the relevant parts. Trying to modify the motor itself often results in a poor running motor that usually does not deliver the desired results. <br /><br />I'd start by investing in parts lists for both motors and then finding which parts are different and then determining whether or not it's a relevant "performance" part...<br /><br />- Scott
