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25 hp Jet cavitating issues suddenly

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25 hp Jet cavitating issues suddenly

Postby Fishnbc » Sun Mar 11, 2018 7:01 pm

I have a 12.5 merc quiksilver inflatable and a 25 hp mercury two stroke jet and it has ran fine for 4 years and then this last year it started to cavitate or over rev frequently. I changed the impeller liner and impeller and it has a ton of jam but just over revs and i am wondering why all of a sudden is it doing it.

Here are a few pics of the grate and bottom?

Any idea what the hole is for in the last photo?



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Re: 25 hp Jet cavitating issues suddenly

Postby MT sauger skiff » Tue Mar 13, 2018 12:15 am

Not enough info to go on. Need to determine if hull or motor. I would leave boat tied to trailer and run motor to see if it overrevs. if so then motor...if not hull.........and it is a relief hole
1960 MT Roughneck with 150 hp Johnson jet
1860 CJ Roughneck with 150 hp E-TEC jet
MT sauger skiff
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