Section 3.4

CARBURETOR

ADJUSTMENT

The carburetor used on the GV-220 engine has a FIXED, NON-ADJUSTABLE Low Speed Jet.

ENGINE SPEED

Engine speed is controlled by the A6060 circuit board. That circuit board signals a stepper motor which moves the throttle linkage. Engine speed will vary in response to changes in generator AC output voltage.

The circuit board monitors the demand for power and adjusts the engine speed accordingly. This permits the engine to deliver only the power needed.

NOTE: Do NOT attempt to accelerate the engine manually by, grasping the throttle or throttle link- age. This win cause the system to enter a fault condition and terminate generator AC output.

THROTTLE LINKAGE ADJUSTMENT

If necessary, the length of the linkage between the stepper motor and the carburetor throttle lever arm can be adjusted. This adjustment helps to establish the proper travel relationship of the linkage. If the adjustment is not correct, the A6060 board will not be able to control the full range of engine speed. The fol- lowing conditions might occur:

•If the throttle linkage is set too short, the system will not be able to provide wide open throttle or full power conditions.

•If the linkage is set too long, the system will not be able to provide closed throttle or no power condi- tions.

Use the following procedure to ensure the linkage rod is properly adjusted:

1.Start the engine and immediately shut it down. As the engine coasts to a stop, observe from above the engine as the carbu- retor throttle lever rotates counterclockwise.

2.There should be a gap of about 0.003 inch (0.08-0.5mm) between the stop tab on the throttle lever arm and the stop block on the carburetor casting. See Figure 4.

CAUTION! The next step involves bending a

!spring clip. Do NOT overbend the clip or it may lose its clamping force.

3.Use pliers to lightly compress the spring clip on the carburetor lever arm (Figure 5). This permits the linkage rod to slide freely through the clip. With the clip compressed, rotate the throttle lever in the appropriate direction until there is a 0.003 inch (0.08-0.5mm) gap.

4.Release the spring clip to lock in the adjustment.

Figure 4. Set Gap Between Stop Tab and Stop Block

Figure 5. Adjusting Throttle Linkage

CARBURETOR REMOVAL

To remove the carburetor from the engine, proceed as follows (see Figure 6, next page):

1.Disconnect the carburetor fuel inlet line.

2.Loosen the clamp and disconnect the carburetor air inlet hose.

3.Remove the two M6-1.00 x 90mm screws that retain the carbu- retor.

4.Remove the carburetor air inlet adapter, the air inlet adapter gasket, carburetor and carburetor to skirt gasket.

5.Remove the sheet metal carburetor skirt.

6.Remove two gaskets and the carburetor spacer.

Page 3.4-3

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Generac Power Systems 941-2, 940-2 service manual Engine Speed, Throttle Linkage Adjustment, Carburetor Removal
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941-2, 940-2 specifications

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