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    coverting Yamaha 4hp 4stroke to 6hp 4 stroke

    If you cant afford to buy another motor like me....try this yep the motor for the 4, 5 and 6hp 4stroke is the same weight, same bore stroke, same cc of 139. based on 1hp=25cc then 139cc =5.56hp but most engines are tuned down to a lower HP for better engine life. Ok what to do ......change...
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