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  1. #1
    skigolfnut's Avatar
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    New way to test 785 tripple pipes in hull

    I was able to pressure test each individual exhaust pipe while they were still bolted in hull,
    I took the water line off the red manifold like suggested,
    I tool the pisser line off the fitting and put a pressure gauge on the end of that hose,
    I took all 3 plugs out and took part of my compression tester hose that goes in the plug hole and hooked one end to the water line from the red manifold,
    bumped the starter a few time and put about 15 psi in the line, the pressure held for 30 minutes and did not drop,

    I did that for all three pipes and there was no air leaking anywhere,
    see pictures below,
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  2. #2
    Moderator beerdart's Avatar
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    Thats thinking with your dipstick "JimmY"

  3. #3
    I'D RATHER SWEAT THAN SHIVER hyoctane23's Avatar
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    Good deal! I like the idea of using your compression gauge line to pressurize the pipe.

    Probably wouldn't work on some water routings where the stinger is fed from one of the pipe pisser exits. I think they did that when each pipe had a Jet Works valve in 1999+ models?? Of course it could still work, just have to plug that one extra hose.

    Are you having RPM issues?? Or just double checking everything?

  4. #4
    skigolfnut's Avatar
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    having rpm issues, I put the new mag piston in and 3 new sets of rings and I am getting 170-178-170 compression with the hot seat head (thanks lugs) I put the 10-17.5 prop on and was only getting 7500 rpms on some short burst after about a 2 hour break in, and 53 on the GPS
    so first thing was to check the pipes to see if they were leaking,
    next step is to put the bone stock prop the 12/17 on from the factory and have a base line to see where it is at with the rpm's

  5. #5
    I'D RATHER SWEAT THAN SHIVER hyoctane23's Avatar
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    Damn, that is a bummer! Definitely put the stock prop back on and see! I would think if there was a water leak, you would see exhaust coming out of the pissers?? Of course, you got to start with the basics...

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