Does anyone know how I can convert my 15hp Yamaha 4 stroke to a 20hp. Thanks in anticipation of some advice?
December 25, 2009 | Motorcycles
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Re: “Does anyone know how I can convert my 15hp Yamaha 4 stroke to a 20hp. Thanks in anticipation of some advice?”
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Not possible unless you bore the engine 30 over, new carbs add such, would be different if you had a 9.9 and wanted a 15 hp, allit would have taken is a new carb ad maybe reed valves, but as CC”S nope, keep puttering along, guess you have too much load ( the Wife ) to get it on plane, lmao