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Message: <blockquote data-quote="DaleH" data-source="post: 476717" data-attributes="member: 15636">Well, OBs can rate +/- 10% of the HP label so your 35 could have output from 31.5 to 38.5hp. Rated at the crankshaft, losses were never as much as reported, most believing a 7% loss, so if your 35 was a 35, she was likely over 30, probably closer to 32 at the propshaft.If running E10 fuel, besides being 'tired', ethanol fuel is ~90% as efficient as the old gas fuels so you lost another 10%.Adding to that, there's no way/no how that 4-stroke 25hp or any 30hp is going to replace your 2-stroke 35 for torque. From my experience w/ smaller to mid-range 4-strokes ... you'd need a 40hp to duplicate your current performance!</blockquote>