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2014-2015 Yamaha SVHO motor issue (severe)

Discussion in 'Jet Skis' started by ScarabMike, Sep 25, 2015.

  1. Ron@Scarab

    Ron@Scarab Active Member

    Messages:
    146
    Location:
    Fort Myers, Florida
    Ratings:
    +79 / 0
    Boat Make:
    Scarab
    Year:
    2017
    Boat Model:
    HO Impulse
    Boat Length:
    26
    Well, I was assuming he already knew that PWC and jet boats need flushing. You are not rinsing a "heat exchanger" on a Rotax. You are rinsing out the exhaust manifold to the water box or muffler. The heat exchanger, as some people may call it, is actually the sealed ride plate under the jet pump (on single engine models), that is filled with coolant, and or the plates mounted on either side of the hull alongside the jet pumps (twin engine), to cool the motor after the thermostat housing on the PTO cover opens up, and then it repeats the cycle.
     
    • Like Like x 1
  2. Fourjets

    Fourjets Well-Known Member

    Messages:
    34
    Location:
    wilmington N.C. 28412
    Ratings:
    +16 / 1
    Boat Make:
    Yamaha
    Year:
    2014
    Boat Model:
    Other
    Boat Length:
    PWC
    Ok. So I took my new fx SHO out for the 1st time today. Engine ran just fine. BuT, when im at idle speed and i go for a hole shot the prop cavitates and shakes the boat until it hooks up after 2 or 3 seconds of cavitation. Normal???
    The prop is in good shape and no large gaps betweem the prop and jet housing....
    Thoughts? ??
     
  3. Ron@Scarab

    Ron@Scarab Active Member

    Messages:
    146
    Location:
    Fort Myers, Florida
    Ratings:
    +79 / 0
    Boat Make:
    Scarab
    Year:
    2017
    Boat Model:
    HO Impulse
    Boat Length:
    26
    Bad impeller? Not normal. Define new FXSHO, what exact year?
     
  4. Fourjets

    Fourjets Well-Known Member

    Messages:
    34
    Location:
    wilmington N.C. 28412
    Ratings:
    +16 / 1
    Boat Make:
    Yamaha
    Year:
    2014
    Boat Model:
    Other
    Boat Length:
    PWC
    2011 FX sho
     
  5. Fourjets

    Fourjets Well-Known Member

    Messages:
    34
    Location:
    wilmington N.C. 28412
    Ratings:
    +16 / 1
    Boat Make:
    Yamaha
    Year:
    2014
    Boat Model:
    Other
    Boat Length:
    PWC
    Correction 2014 FX sho
     
  6. Ron@Scarab

    Ron@Scarab Active Member

    Messages:
    146
    Location:
    Fort Myers, Florida
    Ratings:
    +79 / 0
    Boat Make:
    Scarab
    Year:
    2017
    Boat Model:
    HO Impulse
    Boat Length:
    26
    Well, if you don't have anything in the pump, and your impeller isn't damaged in any way, you might just need a pump stuffer kit. That kit reduces cavitation through the pump support and ride plate by filling in all of the open spaces between the two. I would probably add that kit and change out the impeller since you'll be in there.
     

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