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Thread: 240 sport jet

  1. #1

    Default 240 sport jet

    I have a 2002 Ali Craft 20' jet boat with a 240 mercury sport jet. I've been having problems with it cavitating. my ride plate and stomp grate took a pretty good beating in the skinny water down here in SW Colorado. I've replaced the stomp grate and ride plate, taken the nicks out of my hi-skeww impeller. it's way better but it still cavitates at around 4800-5000 rpms. if I go wot it really cavitates. seems to bite better turning left than right. any suggestions?

  2. #2

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    Any significant dents in front of the intake?

  3. #3
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    Sorry, I can't add anything to the cavitation, however how is your 240 on fuel and do you get significant smoke during cold start?

  4. #4

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    there was a torn spot in the uhmw but I repaired it, doesn't smoke alot, 7-8 gal per hr.

  5. #5

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    does anyone have any negative feedback on the hi-skew impeller?

  6. #6
    Member AkTrouter's Avatar
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    Quote Originally Posted by dwclear View Post
    Sorry, I can't add anything to the cavitation, however how is your 240 on fuel and do you get significant smoke during cold start?
    My 240 loves fuel and from what I understand the smoke at start up is from the extra shot of oil to help against dry starts...

  7. #7
    Member SusitnaAk's Avatar
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    Quote Originally Posted by colorado jet boater View Post
    does anyone have any negative feedback on the hi-skew impeller?
    Look up Toshiro, {tjm}, Threads. Northway just posted a bit ago, that he liked the change.
    He did alot of testing of these impellers.I would start with the bottem and a straight edge
    As you are not getting clean water flow to that grate,I believe you will find some humps/or wollows in your hull taking the water away from the jet, mid section, on back because gets worse as go faster. the boat rises farther out of water.

  8. #8

    Default 240 sportjet

    my problem with slipping at w.o.t. ended up being a leaking ride plate seal. fixed it and the boat is running great again. thanks for your help. Mike.

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