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  1. #1

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    any problem with doing a 2 stroke leak down test through spark plug?

    Anyone know if I can use a standard four stroke tester at BDC and plug the exhaust and intake ports to do a leakdown test on a 2 cylinder? all the two stroke test kits look to do it through the carb. I ordered plugs for the intake and exhaust manifolds.

    It seems like it should work fine because it would pump air into the crankcase as long as the intake port is exposed. Am i missing anything by doing it this way?


  2. #2
    JKR1300's Avatar
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    Sure - if you could if you can figure out how to block off the exhaust & intake.
    You can add air pressure anywhere you want to the sealed case / cylinders.
    The kit I have has a schraeder valve on the exhaust manifold block-off plate.

  3. #3

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    I opted to buy some pipeplugs that would fit the diameters needed and was thinking of just adding at the plug. Seemed funny to me that the four stroke test kits dont mention 2 stroke cases and the 2 stroke kits always seem to add air through the manifold..... was wondering if I was missing something.

  4. #4
    WP3223's Avatar
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    Try doing a search here in the 2-stroke section for "pressure test". I believe there may a few sources here to buy a kit from.

  5. #5
    PolarisNut's Avatar
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    Are you trying to do a true "leakdown" test, to see how the rings are sealing (I wouldn't bother on a 2 stroke)? Or are you trying to pressure test the case for leaks?

  6. #6
    Yamaha artisan Cutlass's Avatar
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    Yeah if you're trying to leak test the crankcase, a 4 stroke leakdown tester hooked up to shop air is way too much. You only want 5 to 10 psi for a crankcase pressure test, I believe.

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