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

Supplemental Modification Information

This modification can lower CO emissions at high altitude by:

1. Enlarging the secondary air filter outlet diameter thereby allowing more air to reach the catalytic converter.

2. Enlarging the carburetor's altitude compensator port leaning out the air/fuel mixture at altitudes above approximately 3900 ft.