Re: First Boat, Several Questions
EQCM2B<br />First off, welcome to the board!<br /><br />Your problem is that you are "Over Propped", that is, you're prop has too much pitch and you're engine is killing itself. If the engine cant reach normal operating range, you will lug the engine and cause high carbon buildup which eventually make the powerhead fail.<br /><br />You're current prop is a 13.75x15. What you want to do is decrease the pitch of your prop until your boat (When normally loaded)operates in the middle to high end of the engines mfgr's recommended operating range.<br /><br />A 1 inch decrease in pitch will yield roughly a 200 rpm increase in rpms. The 3500 rpm you mentioned, was that regular cruising or while pulling a tube? <br /><br /><br />Check what your engines normal operating range should be, then do the math for the correct size prop. (I dont know the range for your engine otherwise I'd tell you, sorry, It's probably 4500-5500 I'd guess). I would guess an 11" or 12" pitch prop is what you'll need. What you dont want to do, is get too low a pitch that allows the engine to exceed the range.<br /><br />Anyways, with the correct size prop, your boat should be able to cruise faster and pull the tuber out of the water without all the strain.<br /><br />Nav
