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I do have another prop. I tryed the shifter in gear and when in reverse the prop turns freely. I can hear it clicking so I think I may have the prop bearing shot

Happens when going straight. I prop is a little banged up. I am putting on my other one, in good shape and taking back out. It didn't happen until after we had been out for a while. I have a larger aftermarket cavitation plate on it and it is secure. Drive was all the way down while it happened...

The engine still seems to have the power,reving up but the forward motion of the boat slows. It feels as thou the prop is not rotating. Also thanks for the suggestions on the couplers I will check that out.

Hello I am a new member to Endless Boating. Here is my problem, I own a 1977 4winns 16 foot I/O 140HP. Nice little boat. I did not run it last year. This year (last 2 weeks) I replaced the starter, points, cap, condenser and coil. Runs good so I took it out on the lake. At 4000 to 4500 RPM after...