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Message: <blockquote data-quote="airshot" data-source="post: 523094" data-attributes="member: 1183"><p>Acceleration is the big difference, but in a boat the faster rpm gain of the two stroke pushes it ahead.   Don't get me wrong, the new 4 strokes are nice, quiet, easier on fuel but heavier.  These new engines can get expensive when repairs are needed.  Have a friend that works as a Merc factory technition,  when these newer engines have a repair issue, they just bolt on a new engine to the lower unit as labor costs for repair far exceed the replacement cost.  I don't expect to see a lot of these 4 strokes still running after 40-50 years like we do the old two strokes.  I have a 1992 Merc 40hp two stroke that looks like new and runs like new and easy on fuel for far less money than 9-10K new four stroke.   Gotta save an awful lot of fuel to make that up !</p></blockquote><p></p>