Spun hub?

[Silversoul]

Motor: 1989 US Marine Force 50
Prop: 10 1/4 x 12 ‘non thru-hub’

So I purchased a ‘90 Spectrum bass boat about a month ago. Have taken it out a total of 5 times. The motor has been running great. Seemingly no mechanical issues. The 4th time I took the boat out I starting having issues with speeds above about 19-22mph. The prior times I took it out I was running 25mph no problem. On my 4th trip out, about 3-4 times that day, if I got over about 20mph my motor would rev up and kick out of the water. On the 5th trip out, any time I’d get over 14 it would kick out. Motor itself still ran great, just would kick out above 14. Went online, and I’m 90% positive that I have a spun prop. Also found out that it’s not a completely standard style prop. It’s a ‘thru-hub’ style prop. It doesn’t seem to have a standard hub like most. I’m no mechanic by any means but it seems that the piece that accepts the splines from the prop gear shaft and the hub are one piece. Does this seem accurate to anyone? Also, since Force parts are hard to find, I’m hoping I’m not SOL on this. I think I may have found a prop that will work. Not sure tho..

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[WesNewell]

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[Sea Rider]

At which wot rpm numbers was the motor revving at, if replacing the prop must dial one for the motor to rev at least middle of its wot rpm range factory stated although max is preferred as usually loaded.

Happy Boating​

 

[Texasmark]

Get some sort of permanent marker...a scribe line where you cut through the paint to the aluminum would work. Scribe the line from the protrusion on the right side of the prop in picture #2 straight back to the main prop area and on across the main area enough to see that if the two parts move from their current position, you can detect it....the protruding part is part of the central hub, and then on across the external casting containing the blades a little bit. Connecting the two is a rubber insert/cushioned rubber slip hub....designed to yield and reset upon impact. A slipping prop means that the rubber insert has ceased to join both sections as it is designed to do. If you scribe as mentioned, and experience the same problem and check the line and it is still a straight line as you scribed it, then something else is your problem.

That prop could be found under Chrysler or West Bend engines of that HP range. Try the parts section here top of the page under the title "SHOP", props, select engine or kin I mentioned, fill in the blanks.