SUB-EGR Valve Inspection and Service

1. While opening the Main Throttle lever by hand, observe the Sub-EGR Valve for smooth movement (Figure 19).

2. If the Sub-EGR Valve is stuck or if it does not open smoothly, service the Sub-EGR valve as described below.

3. If the Sub-EGR Valve operates correctly, proceed to Jet Mixture Solenoid Valve Replacement.


SUB-EGR VALVE SERVICE

If the carburetor has not already been removed, remove the carburetor. See the Carburetor Removal.


Remove the Sub-EGR valve from the carburetor and clean as described.





1. Push the Sub-EGR valve pin in the direction shown in Figure 20 until it stops. Raise the lever to disengage it from the pin.

2. Remove the valve from the carburetor.





Note:
If the Sub-EGR valve will not come out of the carburetor, remove the snap ring from the Sub-EGR valve pin (Figure 21). Then carefully remove the pin and the link, taking care not to lose the spring and steel ball from the valve. Insert a small phillips screwdriver in the pin hole for use as a handle. To loosen the carbon deposits, spray carburetor cleaner into the Sub-EGR Valve passages. Then, remove the valve from the carburetor.





3. Wet a piece of fine crocus cloth and cup it in the palm of your hand. Clean the valve by twisting it in the crocus cloth (Figure 22) or use the brass wire brush and carburetor cleaner.

CAUTION:
Do not clean the valve with a steel wire brush as it may scratch the valve. Scratches will allow carbon to build up on the valve quickly.





4. Spray carburetor cleaner into the Sub-EGR valve bore. Insert a round brass brush into the Sub-EGR valve bore and clean the plunger hole (Figure 23). Use the round brass brush to clean the underside valve passages.

CAUTION:
Do not use a screwdriver or a steel bristle wire brush in the bore of the Sub-EGR valve since this will scratch and cause carbon to build up quickly.





5. Dry the valve and plunger hole thoroughly. If removed, install the spring, steel ball, pin and snap ring. Reinstall the Sub-EGR valve in the carburetor (Figure 24). Connect the valve linkage to the pin.