Air Control Valve
- After ensuring air pump and all hoses are correct, check carburetor and air control valve attaching nuts for tightness. Warm engine to normal operating temperature.
- Stop engine and connect a tachometer. Disconnect air cleaner-to-air control valve hose at air cleaner. Disconnect both vacuum hoses from relief solenoid valve (Blue color dot).
- Using rubber hose, by-pass relief solenoid valve by connecting vacuum lines on each side of relief valve together. See Fig 1 . This will cause manifold vacuum to be routed directly to air control valve.
- Start engine and run at idle. Place finger over air cleaner-to-air control valve hose and check that air is not escaping through hose. Disconnect rubber hose used to by-pass relief solenoid valve; air should escape at air cleaner-to-air control valve hose.
- Reconnect by-pass hose at relief solenoid valve. Using throttle, set engine speed at 2500 RPM. Disconnect vacuum sensing tube from switching solenoid valve (Gray color dot).
- Place finger over air cleaner-to-air control valve hose; air should escape through hose. Reconnect switching solenoid valve vacuum tube.
- Air should not escape at air cleaner-to-air control valve hose. If air control valve does not respond as described, replace air control valve.