Does anyone know if horsepower vs rpm curves are available to outboard engines, and where I could find one for a Yamaha 70hp two stroke?<br /><br />My parents boat (pontoon) has this engine and at full throttle it is at 5500 rpm. I notice that my Johnson 50 has a tag that says it is rated 50hp at 5500 rpm.<br /><br />I am interested in comparing the boat's speed at increasing rpm to the horsepower.<br /><br />Thanks
