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Posted: **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

Posted: **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