I have a Grady White gulfstream with twin 1989 Yamaha 130 outboards. Recently my port engine has been shaking while at idle and fast idle. As the engine is reved up it seems to smooth out, but will only rev to 3500 rpms whereas the starboard revs to 5200 at full throttle. It has a throaty sound compared to the normal running engine. With both throttles in the same position the port engine is at about 500 fewer RPMS.
Just recently it was running fine and I checked the spark plugs and all are getting good spark. Any ideas?
Just recently it was running fine and I checked the spark plugs and all are getting good spark. Any ideas?
