I bought my boat nearly two months ago it is a 1988 Sportcraft 205 with a 140 hp OMC mounted on a Seadrive. The first time I took it out the overtemp horn would sound when the rpm exceeded 3500, but the power was fine and the boat planed out at 5500 rpm. After my mechanic replaced the...
After a thorough tune up my OMC140 hp on a sportcraft 205 runs terrible. The max rpm is 3800,<br />max speed is 10-12 kph and milage is less than one mile per gallon. My mechanic cant figure this one out all electronics check out and the carbs look good. Once in a while the engine would perk up...
