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  1. #1
    diamondwatercraft's Avatar
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    Fuel Mileage way down 96 XP

    My 96 XP took on some water this year inside the hull and I think it may have ingested a bit. It now has trouble cold starting, is not as responsive as it usually is, and it is really sucking down the gas. More than usual. A top end is no doubt gonna be done over the winter. The compression is down 20 lbs or so. I also noticed when I fogged it that it had no effect when I sprayed one cylinder. The other killed the motor. Telling me that one is really not helping much.

    Anyone got any helpful tips to check besides checking the oil pump? My winter project will be checking and re-checking this thing for smooth riding next summer.


  2. #2
    This is how I run a jetski shop in the desert nmpeter's Avatar
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    you'll want to carefully examine the rotary valve, but methinks your crank seals are on the way out. I'd pressure test it once the season is over before you start pulling it apart..could also be a case leak....

  3. #3
    diamondwatercraft's Avatar
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    I am afraid of that. Thanks for the hint. The sure way is to do a complete rebuild. But most expensive too.

  4. #4
    john zigler's Avatar
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    787 should be 150-155lbs for compression. If you are truly down 20lbs, you have a dead hole.....

    This would cause poor performance, hard starting, etc. motor rebuild time.

  5. #5
    diamondwatercraft's Avatar
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    Agreed this machine is a ppg level one. I had 173 lbs now I am at 153 on each cylinder I have to really do some investigation.

  6. #6
    Myself's Avatar
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    Eeewww, sounds like your oil pump may have died. Pull the RAVEs and look for scoring on the pistons.

  7. #7
    diamondwatercraft's Avatar
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    I will check thanks for the tip!

  8. #8
    Paradise rider aruba yamaha's Avatar
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    How long since you replaced the top end? Most of the time loosimg compression arema indication of worn rings. Since you doing the top end, I would also check the crank for any play. A 17 year old,craft have giving you a lot of pleasure. I got the same craft and I'm planning on doing a complete rebuild myself. Check on atlanticjetsports.com they sell a complete rebuild kit for,around 800 bucks. Better play it safe and save a lot of money afterwards. If you got an case leak you can expect a lot more damage like a thrown rod. Then it really turns expensive. Good luck

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