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  1. #1

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    Use teflon tape for good compression check seal?

    Did compression check with my $50 NAPA gauge yesterday. Had moisture around plug holes (I'm guessing condensation from sitting outside overnight after riding) and noticed air escaping from chamber around threads. Have 1/2" of thread on gauge. Can't get wrench down in there to tighten further. Can I use teflon tape to seal? Does gauge thread depth affect reading?
    Read 105, 107, 110 on a 256 hour GP1200R. Rich (WFO) said that's a little low. Just wondering if sealing threads would bump that reading up some.
    Thanks.


  2. #2

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    Thread depth and gauge quality can both effect your readings. Suggest you beg, borrow, or steal a Snap-on or other high quality gauge with the proper thread depth.

    The good news is that the readings that you got are within 10 psig of each other, and that is usually a very good sign.

  3. #3
    SurfRider's Avatar
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    If you are talking about a compression tester gauge, they usually have a rubber o-ring that seals between the head and the fitting (on the fitting itself). It should only be hand tight. You just twist the rubber hose with your hands. I would not use a wrench on it as you would probably damage the o-ring.

  4. #4
    WATER WOODY's Avatar
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    Quote Originally Posted by SurfRider View Post
    If you are talking about a compression tester gauge, they usually have a rubber o-ring that seals between the head and the fitting (on the fitting itself). It should only be hand tight. You just twist the rubber hose with your hands. I would not use a wrench on it as you would probably damage the o-ring.
    +1

  5. #5
    Yellow93's Avatar
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    Make sure you are doing your tests with the throttle open as well.

  6. #6
    DAGO RACING CREW 97GPSLEEPER's Avatar
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    Also make sure the battery is 100% charged.

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