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)

Or, hide this message: temporarily or permanently

High to Low Altitude


1. Disconnect harness connector on altitude switch and solenoid valve assembly from body harness connector.
2. Disconnect large rubber hose from air cleaner pipe with 3-way connector. Disconnect large rubber hose connected to carburetor 3-way connector.
3. Remove air cleaner.
4. Remove three small rubber hoses attached to solenoid valve from air passage pipe on carburetor. Attach rubber caps to these air passage pipes.
4. Remove vacuum switch assembly and altitude switch and solenoid valve assembly, then reinstall vacuum switch assembly.
6. Reinstall air cleaner and connect large rubber hose from carburetor to air cleaner and secure with clips.
7. Adjust engine speed to specification, check timing, and remove label.