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

Air Injection Check Valve: Testing and Inspection

1. Disconnect supply hose from air pump side of valve.
2. Observe valve pintle by looking into valve through disconnected port.
3. Accelerate engine to 3000 RPM, then release throttle. Pintle should be open and then close.