Solenoid Operated Fuel Cut-Off Valve
Idle speed has been increased to 750-800 RPM. This increases air flow past throttle butterfly under closed throttle conditions and is complementary to throttle butterfly modifications. To prevent running-on due to high idle speed, a solenoid operated fuel cut-off valve has been incorporated in carburetor. This takes the form of a solenoid operated needle valve operating to cut off idle by-pass drilling and progression chambers when ignition is switched off. Solenoid is located externally on carburetor body and is electrically connected to switch side of ignition coil.