now that i have the eng running right i would like to know if a 14+19 prop would increase gph and top speed at 5500 rpm .the 15+17 top out at 5600 rpm or would a 14+21 BE TO MUCH PITCH?THE 15+17 SEEMS TO RUN GOOD UNDER a load of 2or 3 people but when i run by mysely it seems to go noweare. my gole is speed and gph right now it burns at least 6 gal of gas in about 1/2 hour at 4500rpm ,as i ran 6 gal test tank. to see if the gas was bad,and it was ,pumped it out.
