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I have a mercury 9.9hp 2 stroke tiller no elec start mid 90's and I am looking to change it from a 9.9 to 15hp. I have been online and I see carbs for sale that are for 6,8,9.9,and 15HP engines so Not sure changing the carb is my answer? is there a restriction plate or something that has to be removed to get the full power out of this engine? I can't see a 6hp carb doing the same thing as a 15hp can any one help me on this? I just can't see selling my 9.9 to Buy a 15 when I am the original owner of the motor and I know what I have and don't want someone elses junk?
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We don't make any horsepower conversions here and not sure if would be possible or not.Regards
Boats.net
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The 15 and the 9.9 are the same size and weight for starters and they share the same size engine block as far as I am aware of. I know that in the past Johnsons just had a carb change and that would remove the 9.9 restriction on the motor same for a 2000 tohatsu(Nissan) that I had. So can anyone tell me if there really is a difference on the carb or with the exhaust system of these 2 stroke Mercs. With the carbs the same on both engines are the 9.9's just toned down with a simple adjustment of the throttle screw like on an ATV thub throttle for a kids atv? I have purchased Parts for my motors from Boats .net before so tell me since I am willing to buy parts what will I need or what do see in the motor schematic that would be different between the 2 motors that would change this? my motor is around a 1997. i believe the serial # is
OGO7---- cant remember the rest not at home at the moment. anyone who may have ever upgraded the motor before please let me know what you did.Comment
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