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28hp special

14'bass

14'bass

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Hello guys wanted to know if you guys can diagnose or give me insite on somthing that's going on with my motor. I believe I have a 1985 ish 28-30 outboard on my 14' and I was using it the other day and when I was at just about 3/4 throttle it seemed as if the engine popped into nutral and revved really high was the prop stoped;as I was driving it on the lake. Any hints on what it is?
 
It depends on what happened after that encounter. Did the problem appear to correct itself after that, reoccur time after time, stay as it was and you required towing in.... what?
 
joereeves said:
It depends on what happened after that encounter. Did the problem appear to correct itself after that, reoccur time after time, stay as it was and you required towing in.... what?
Click to expand...

It happened quite a few times after, didn't stop till I had enough and brought her in. Didn't reuire tow in and yes it recovered once I had to idle her down and she kinda like started to go again once idled down, and I was off again
 
The most likely scenario is that the bronze propeller hub is slipping with the aluminum or SS propeller at the higher rpm.

To test, remove the prop nut and with a magic marker, mark the hub and also the propeller so that the marks are aligned.

Now, run the engine on the water so as to encounter that problem, after which, remove the prop nut to inspect those marks.

If they are out of alignment, the hub us slipping and if so, the cure is to have the propeller re-hubbed or to install another propeller.

If the marks are still in alignment, the propeller is probably cavitating due to being too close to the water's surface, or something on the boat's hull interfering with the water flow to the propeller, something of that nature.

There is also the remote possibility of having the splines starting to fail between the crankshaft and the top of the driveshaft, however that would be my last suggestion.... not a common happening.
 
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