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What is the right way to preform a leak down test
  • flatop016
    Posts:22
    Joined:Mon Sep 13, 2010 7:54 pm
    What is the right way to preform a leak down test

    by flatop016 » Sun May 24, 2015 6:11 pm

    What is the right way to preform a leak down test and compression test on a 08 crf 450r
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    JimDirt
    Posts:4406
    Joined:Sat Nov 25, 2006 6:31 pm

    by JimDirt » Sun May 24, 2015 8:05 pm

    Leakdown is done with the engine on Top Dead Center , Compression Stroke 100psi at gauge , if air is heard thru Intake , then Intake Valves , if heard thru Exhaust , then Exhaust Valves , if thru Crankcase , then Rings , if thru Radiator then Head Gasket

    5% leakage is about all i would accept at absolute most for a issue to be concerned about , obviously anything more would mean mandatory tear down , optimal would be 0%

    This is the procedure for the Compression Test
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    2020 CRF450R
    2006 CRF450X
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    Weiser , Idaho
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