1. Hook a vaccume gauge to a good vaccume sorce
2. Warm up engine to operating temperature and turn off.
3. Set all idle mixture screws on both carburetors, turn clockwise until seated then turn counter clockwise 2 1/2 turns.
4. Start engine, turn all 4 screws 1/8 turn counterclockwise and check vaccume gauge, reading should increase.
5. Repeat screw adjustment sequence until the vaccume drops. Turn all 4 screws 1/8 turn clockwise
6. Adjust idle speed to desired RPM
Done.