Operation CHARM: Car repair manuals for everyone.
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

NOTE: Specifications are for intake and exhaust unless noted.

Compression Pressure @ Height *

[Pressure] [Height]
Intake
365 N 25.1 mm
145 N 34.2 mm
Exhaust
422 N 26.1 mm
180 N 34.2 mm

* Without damper.