Thank you for helping me with my question.
I have recently bought a 1979 Evinrude 15 hp project motor for a hydroplane I built this winter. The motor needed some repairs and over the winter I replaced the fuel lines, replaced the low idle adjustment screw knob, rebuilt the recoil starter, replaced the high-speed anti-starting paul and replaced the water pump. Compression seems good and the engine starts and runs.
I recently took the engine out for a test drive on a 12-foot MirroCraft. The engine and drive run well until about half throttle. It then loses power and the engine starts to over rev.
Is there a re-assembly adjustment I need to make to the drive shaft or lower unit drive gears following the removal of the lower unit for the water pump repair?
What else may be causing the engine to lose drive power? I have a hard time believing this is cavitation. I will be taking the engine out for another spin to take it through full trim adjustments. The drive shaft splines looked good at both ends when I had it out.
Thanks,
Jim
I have recently bought a 1979 Evinrude 15 hp project motor for a hydroplane I built this winter. The motor needed some repairs and over the winter I replaced the fuel lines, replaced the low idle adjustment screw knob, rebuilt the recoil starter, replaced the high-speed anti-starting paul and replaced the water pump. Compression seems good and the engine starts and runs.
I recently took the engine out for a test drive on a 12-foot MirroCraft. The engine and drive run well until about half throttle. It then loses power and the engine starts to over rev.
Is there a re-assembly adjustment I need to make to the drive shaft or lower unit drive gears following the removal of the lower unit for the water pump repair?
What else may be causing the engine to lose drive power? I have a hard time believing this is cavitation. I will be taking the engine out for another spin to take it through full trim adjustments. The drive shaft splines looked good at both ends when I had it out.
Thanks,
Jim
