Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Compression Check: Specifications

1. Start and warm engine to operating temperature.
2. Remove all spark plugs and apply a few drops of engine oil into spark plug holes.
3. Relieve fuel system pressure as outlined under Precautions.
4. Disable ignition system, by removing ignition fuse.
5. Connect a tachometer and crank engine, ensure cranking speed is 300 RPM or higher.
6. Install compression gauge, then crank engine with throttle wide open.
7. Minimum pressure should be 128 psi.