Quote:
Originally Posted by Kurt505
What’s a leak down?
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Put positive pressure into the cylinder and see how long it takes to drop off. Usually on a gasser you pump it up to 40 PSI (screws into the plug hole) and then watch the drop on the Gauge. Valves need to be closed or in the case of a two stroke, piston needs to be above exhaust and intake ports. You are looking for how much pressure is getting by the rings over how long, tells you if the rings are worn or the walls are scored.