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not sure if its the same scenario but the 2.5 HP & 3.3hp mercs are the same engine but the gearing is different....

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2.5 & 3.3 Mariners are the same engine, but the 2.5 is restricted by the throttle slide not opening fully - it is physically to long to do so. (I suspect this applies to Mercuries, etc. too.) Number of gear teeth is different because the 3.3 has a F-N gearshift, but the 2.5 doesn't. Overall gear ratio is nearly the same though (from memory).

May be worth checking the Suzuki for the same thing on the throttle slide. Is the part number of the carb for both engines the same? Is there a 'changeable' venturi in the carb? I suppose there could possibly be a restrictor in the exhaust or air 'filter'?

Andy

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