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  1. #1
    Joe Stang's Avatar
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    whats good compression on a wave jammer?

    Just what the title says, I ended up getting one for free that was in a basement for 9 years, thing is in very nice shape, seems to me all it needs is fuel lines, just curious what good compression is on these 500cc engines, they are both the same psi, just curious if its good or not (Numbers not in this post, want to see what the experts say first )

    This is a stock machine. Thanks again in advance.


  2. #2

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    Quote Originally Posted by Joe Stang View Post
    seems to me all it needs is fuel lines
    I don't know what PSI should be but I will tell you that you need more than fuel line replacement! Those carbs must be rebuilt!!!

  3. #3
    Old Ski Insanity w/rpm500's Avatar
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    per factory service manuel.. 142.2 lb.... if you give it a 10% loss... you'd be good at 128...I'D run it rich for a while to help wash it out ... factory says 25 to 1 first 10 hours 'new' ,play it safe... that carb rebuild is an easy one...a 'jammer is even easyer than a 'runner to work on if the motor is in the hull

  4. #4
    Joe Stang's Avatar
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    Quote Originally Posted by roost5o View Post
    I don't know what PSI should be but I will tell you that you need more than fuel line replacement! Those carbs must be rebuilt!!!
    shoulda went further in my replacement, carb clean/rebuild was also on the list

  5. #5
    Joe Stang's Avatar
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    Quote Originally Posted by w/rpm500 View Post
    per factory service manuel.. 142.2 lb.... if you give it a 10% loss... you'd be good at 128...I'D run it rich for a while to help wash it out ... factory says 25 to 1 first 10 hours 'new' ,play it safe... that carb rebuild is an easy one...a 'jammer is even easyer than a 'runner to work on if the motor is in the hull


    Thanks in advance!

    they read a about 138ish both side.


    nice thing is someone spent a lot of time on this machine, fuel tank was tankin out and completly washed out, new starter was put in, new impellor,ride plate and intake grate as well.

    I really made out on this thing, i might fire it up today

    Thanks again!

  6. #6
    Jeepjunkie's Avatar
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    Quote Originally Posted by w/rpm500 View Post
    a 'jammer is even easyer than a 'runner to work on if the motor is in the hull
    Really?!?!?! I can't tell you how many times I've nailed my head on the Jammer's tower trying to look inside the hull. Not fun! Unless you unbolt the tower, but that's a little more work that whats necessary sometimes.

  7. #7
    Old Ski Insanity w/rpm500's Avatar
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    clam shell hood is no prize...cant count how many times the support rod has been knocked loose!!

    the jammers compartment is more open in width and also not as deep as the wr's..

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