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Milford, IL | As noted above, have throttle blades wide open for compression test. Ideally, all cylinders will be within +/- 10%.
Leak down test, lock engine at TDC for that cylinder. Can find TDC by rolling engine by hand and watching piston approach, or use a small straight tool (wooden dowl or screwdriver with great care) and stop when piston is no longer travelling upwards. For high performance small engines (dirt bike, atv, utv) I liked to see 95%+ for a fresh engine. Much under 90% and it was getting time to replace piston or inspect cylinder head for worn valves/seats.
Leak down test is time consuming vs compression test. | |
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How to do a compression test and leak down test on Chevy small block quesions.
