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  1. #1

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    Could this be why my RPM's are down

    I was installing my Riva grate last night and had a closer look at my wear ring. Noticed a number of grooves in it. Pictures are attached. RPM's are down to 7500 for the last while, and SC is fine. Had the dealer check the slip moment and the s/c overall, and it is fine. Then again the same mechanic told me the wear ring is perfect. He must have been looking at the wrong ski
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  2. #2
    rxpblast's Avatar
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    that is about how mine looked before i changed it. i was down to 7800 rpm's but i have not had a chance to test it yet.

  3. #3
    Senior Member watermedic's Avatar
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    That'll do it. Also need to get that impeller boot back on the impeller.

  4. #4

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    watermedic...thanks. The boot you are referring to, is that the black rubber boot that is currently (in the pic) to the right and you are saying is is suppose to sit all the way to the left over the propt? How is is held in place? Sorry if this is a stupid question. I just don't know.

  5. #5
    mxl16's Avatar
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    Quote Originally Posted by North49
    watermedic...thanks. The boot you are referring to, is that the black rubber boot that is currently (in the pic) to the right and you are saying is is suppose to sit all the way to the left over the propt? How is is held in place? Sorry if this is a stupid question. I just don't know.
    the impeller boot and the wear can easliy cause your rpm drop. the boot is threaded onto the impeller. they are reverse threads make sure u use gobs of red loctite so it doesnt come off again. if your mechanic looked at the wear ring and didnt realize 1. that ring is toast and 2. that the boot is sliding up the shaft..DO NOT go back, find yourself another dealer.... TRUST me, ive learned the hard way

  6. #6
    Resident Jicky Jack Jeff C's Avatar
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    That boot is rubber. Loctite wil do little if anything to keep that sucker in place.

    I would use silicone, dab the threads real good, screw it on there and wipe off the excess bead. That should hold it on.

  7. #7
    Senior Member watermedic's Avatar
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    mxl16 called it. Yes the black rubber thing half way up the driveshaft (in the pic) needs to thread into the end of the impeller (reverse threads). If it worked loose, there is a good chance that the threads on the plastic/rubber boot are trashed and you'll need a new one. Not a high dollar item, but the mechanic should have noticed if he inspected the wear ring. From the looks of the ring, either he didn't inspect it or has no idea what he's looking for.
    The boot and wear ring condition would cause a drop in RPM's and poor performance.

  8. #8
    mxl16's Avatar
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    Quote Originally Posted by Jeff C
    That boot is rubber. Loctite wil do little if anything to keep that sucker in place.

    I would use silicone, dab the threads real good, screw it on there and wipe off the excess bead. That should hold it on.
    ur right, im used to dealing with solas nose cones

  9. #9

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    Dude that wear ring is TOAST!

    go to sbtontheweb.com and get yourself anouther one for 35 bucks....

  10. #10

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    P.S. how many hours are on that ski?

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