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Old 09-19-2011, 05:52 PM
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predator 500 question

how much compression should a 03 predator 500 have
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Old 09-19-2011, 06:03 PM
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This is straight from the manual. NOTE: This engine has built--in decompression
components. Compression readings will vary in
proportion to cranking speed during the test. Average
compression (measured) is about 85--90 psi @ 400
RPM during a compression test.
A cylinder leakdown test is the best indication of
engine condition. Follow manufacturer’s instructions
to perform a cylinder leakage test. (Never use high
pressure leakage testers, as crankshaft seals may
dislodge and leak).
Cylinder Leakdown
Service Limit 10 %
(Inspect for cause if leakage exceeds 10%)
Cylinder Compression
w/ decompression
Standard: 85--90 PSI @ 400 RPM
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