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  1. #1

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    spinning the prop

    07 250x with 43hrs 6' timing, riva plate, wedge and u pipe exhaust=73mph. The problem is the rpms shoot up out of the hole. If I lean foward real hard it is not as bad. The pump looks fine no wear good bearings. What the hell is going on?


  2. #2
    www.eastcoastpwc.net Scott's Avatar
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    Quote Originally Posted by r103 View Post
    07 250x with 43hrs 6' timing, riva plate, wedge and u pipe exhaust=73mph. The problem is the rpms shoot up out of the hole. If I lean foward real hard it is not as bad. The pump looks fine no wear good bearings. What the hell is going on?
    Check the clearance between the pump and prop. Its gonna be worn! Been there plenty of time.

  3. #3
    nicjak's Avatar
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    as posted on here many times before once you start modding the ski for more horsepower it will do exactly as you have stated. the pump is maxed out in stock form. others will more than likely chime in for the fix.

  4. #4

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    impros?

  5. #5
    nicjak's Avatar
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    Quote Originally Posted by r103 View Post
    impros?

    more than likely i have only read of there expertise as i'm from down under

  6. #6
    JET250's Avatar
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    you need micky whisker clearances when making more power.

  7. #7
    Some pluck a C-Hair. If it fits between the prop and the pump wall then its time to contact Impros.com.

    Problem with the props is that they are soft. Made to wear before the ring does. 250 HP nose high puts some wear an tear on the thing. Might be as simple as just the prop whore out.

  8. #8
    JET250's Avatar
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    Quote Originally Posted by Skips313 View Post
    Some pluck a C-Hair. If it fits between the prop and the pump wall then its time to contact Impros.com.

    Problem with the props is that they are soft. Made to wear before the ring does. 250 HP nose high puts some wear an tear on the thing. Might be as simple as just the prop whore out.
    prop whore out...good one skip.

    c-hair = micky whisker in down under.

  9. #9

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    What should the clearance be? I need to fix this asap, I'm going to Panama City Beach April 8th.

  10. #10
    Not going to be fixed in time Im afraid. The cost of overnighting to Impros, repairing it, then sending it back is going to cost as much as a new one.


    I have a brand new 250X prop in the box. $280 or $230 with prop exchange.

    Clearance should be.



    Jet Pump
    Impeller Outside Diameter 154.5 ∼ 154.7 mm (6.0827 ∼ 6.0905 in.) Limit =153.5 mm (6.0433 in.)

    Pump Case Inside Diameter 155.0 ∼ 155.1 mm (6.1024 ∼ 6.1063 in.) Limit =156.1 mm (6.1457 in.)

    Impeller Clearance 0.15 ∼ 0.3 mm (0.0059 ∼ 0.0118 in.) Limit =0.6 mm (0.0236 in.)


    What you also may be experiencing is the prop pitch has compress. The force of the motor and the load of the water will in time change the prop pitch causing spinning and slipping ="cavitation"

    Read the last section of the Piston write up. It explanes prop pitching a bit for you. Not that you want to try it but more of an understanding how important the right pitch is.

    http://www.floridasmarthomes.com/teammoto/?cat=85

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