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  1. #1
    bob1988's Avatar
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    over heat question for exerts

    boat is a 06 rxp rotax stage 3 uses a one quarter to half quart of oil per tank of fues has denso plugs burning white looks to be running lean compression test 130 -120-130 rpms 8100 to 8300 feels like boat is surging sounds like cavitation issue gets p1116 code and goes into limph mode all coolant goes into hull trough over flow have no clue what is going on so hopefully someone on here can help us out

    thanks for any help you can give me


  2. #2
    El Tartaro luismendez25's Avatar
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    Have you taken the 2 hoses that come from the oil cooler to the water pump out?

  3. #3
    bob1988's Avatar
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    no i really havent done much didnt know where to start what do u mean take them out are u saying they may be clogged or something

  4. #4
    bob1988's Avatar
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    doesnt anyone have any suggestions or is this a problem no one has had

  5. #5
    HOSS's Avatar
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    You may have crossed the oil cooler lines. I did this and Jerry told me of this prob. It would overheat damn near instantly.

  6. #6
    EZ Dock of Long Island Shibby1485's Avatar
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    sounds like combustion in the coolant passages to me perhaps

    white plugs could be coolant breaching the combustion chamber, or just from HEAT, since you are in fact overheating.... or its getting so hot from a water pump/thermostat problem that the coolant is flownig out from too much heat

    Head Gasket, thermostat, or water pump problem is my diagnosis

  7. #7
    REID2168's Avatar
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    Shib i built this boat it was the FIRST one i ever touched and it has been BULLET PROOF since i put it together 40 hours ago then ALL the SUDDEN yesterday it does this to my buddy while we were riding. i had BOB9188 post this since my puter was BOMBED last night and as BOB1988 stated we checked compression 130-120-130 with our KENNY SCHRADER valve in tack and so wouldnt it MOST LIKELY be the thermo stuck closed????? i cant figure how it could be the water pump if it HAS to turn with the engine running????? unless they can spin OFF in the housing and just be in there NOT moving??? thanks for the HELP!

    Steve (rides it like he STOLE it) Reid

  8. #8
    HORSEPOWER JUNKIE 9secZO6's Avatar
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    Got another thermo-housing? Does this boat have the 158? Steve I know u can swap this w/ another 1 or read kinchlyles' post on the thrermo housing (epoxy but worx good) and get another thermo if that works. This should not be too hard to diagnose w/ some dissasembly.

  9. #9
    REID2168's Avatar
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    i was talking to Doobie earlier today thats whos boat this 2006 RXP is and i got two STOCK thermos from my 07 and his 06 i can try! i was gonna do just that but BEFORE i did i was gonna try boiling water to 160 degreees with a thermometer drop the Rotax 158 degree thermo in it and see if it OPENED UP! should work to check it shouldnt it??????

  10. #10
    HORSEPOWER JUNKIE 9secZO6's Avatar
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    yes, but it should open a good bit b4 boiling......inspect the w/pump impeller as well.

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