Help!!! Sport Jet 90 Issues!!

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brad985

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Aug 24, 2007
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Sport jet 90 impeller

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Sorry guys but this is going to be a long one. I have a 94 Sportjet 90 with the threaded impeller shaft. I wanted to replace the impeller and wear ring but I wanted the solas impeller, so I bought the splined shaft to match the splined impeller that solas makes. (my dealer said this would be no problem) Problem #1 The drive gear that goes on the end is a different spline, I need to replace that gear. Do I also need to replace the one in the case? the splines are different on the shaft but is the gear pattern different? #2 the bearing that I have bought does not fit the shaft, merc says it is the right part. bearing #30-820292 does not fit on shaft 44-820505. The shaft needs to be machined down .020in. I am about ready to thrw this mess away and forget about it. Any help would be appreciated. The wear ring I had machined out by jetco and a new stainless one put in. I think it should be a pretty decent set up if I can just get the damn thing back together.
 

Capt Ken

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Jul 30, 2002
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Re: Help!!! Sport Jet 90 Issues!!

You have a mess. You have one of the first built Sport Jets with the screw on impeller and the spline that goes into the engine is a coarse or 11 tooth spline. Newer engines have the 13 tooth. None of the parts are interchangeable. So if you change the impeller shaft, you have to change the pinion gear which means it now won't fit your engine. Save yourself a lot of trouble and order a screw on impeller from Mercury.
 
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