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)

Or, hide this message: temporarily or permanently

Compression Check

The lowest reading cylinder should not be less than 70% of the highest and no cylinder reading should be less than 1896 kPa (275 psi). Perform compression test with engine at normal operating temperature, glow plugs removed and throttle wide open.