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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High to Low Altitude--W/Auto Trans


1. Remove delay valve.
2. Disconnect harness connector on altitude switching and solenoid valve assembly from body harness connector.
3. Remove one large rubber hose attached to solenoid valve from altitude compensation air pipe. Attach a rubber cap to air cleaner altitude compensation air pipe.
4. Remove air cleaner from carburetor.
5. Remove 3 small rubber hoses attached to solenoid valve from air passage on carburetor. Attach 3 rubber caps to these air passage pipes.
6. Remove ignition coil, altitude switch and solenoid valve assembly, then reinstall ignition coil and air cleaner.
7. Adjust engine speed to specification, check timing, and remove label.