Re: Difference between 70 and 75HP Johnson
Yo, Scott. If you replaced whatever 70 parts with 75 parts the only thing you would notice is a lighter pocketbook. Horsepower numbers are sometimes manipulated for marketing purposes by varying Carb throats, reeds, timing advance profiles, and other, more subtle features. Often the "higher horsepower" engines are simply rated at a higher rpm.<br /><br />You can gain more in hole shot and in top speed by optimizing your balance, prop and trim and by minimizing the drag of your hull than by adding 5 hp to the rating.<br /><br />As corm says: cubic inches=power. If you really want more power, get a bigger engine.<br /><br />Good luck.<br />JB
