Hi , need some help with this boat.
After top end rebuild, engine seemed to run fine but had low thrust so couldnt even plane out.
Had pump completely rebuilt by a shop including drive shaft carbon seal wear ring and impeller. It was checked out late last fall by mechanic who said it ran great.
This spring took it out and same problem. No thrust. Max speed 9 mph.
Can not hear any sign of cavitation (high revving) and not taking on any water. Engine runs smoothly and starts easily. Unfortunately tach is not working so not sure about rpm.
One thing i notice that after about 75 percent throttle engine does not respond by further increasing revs. I checked the throttle butterflies and they are fully opening. Compression is 138/140. New plugs.
Any thoughts would be greatly appreciated. Not sure what to check next.
After top end rebuild, engine seemed to run fine but had low thrust so couldnt even plane out.
Had pump completely rebuilt by a shop including drive shaft carbon seal wear ring and impeller. It was checked out late last fall by mechanic who said it ran great.
This spring took it out and same problem. No thrust. Max speed 9 mph.
Can not hear any sign of cavitation (high revving) and not taking on any water. Engine runs smoothly and starts easily. Unfortunately tach is not working so not sure about rpm.
One thing i notice that after about 75 percent throttle engine does not respond by further increasing revs. I checked the throttle butterflies and they are fully opening. Compression is 138/140. New plugs.
Any thoughts would be greatly appreciated. Not sure what to check next.
