I had this boat given to me with no info. The motor has a partial sn# J6132684,model# J155 and the number on plug is 396246 RPH. <br /><br />I had it out for 1st time today---sucked down 7 gal in 45 min prop loses bite at 3/4 throtle aprox 50mph and overrevs<br />Thinking of going from 15 X 17...