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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Valve Spring: Specifications

DIMENSIONS
Free Length (Intake and Exhaust)
Standard (New) 40.84 mm (1.61 inches)

Squareness
Standard (New) 2.0 mm (0.080 inches)
Service Limit (Maximum) 2.5 mm (0.100 inches)

Force/Tension
At 25.0 mm (.984)
Standard (New) 727-802 N (163-180 lbs.)
Service Limit (Minimum) 700 N (157 lbs.)
At 34.0 mm (1.34)
Standard (New) 294-343 N (66-77 lbs.)
Service Limit (Minimum) 280 N (63 lbs.)