Westinghouse WGen9500, User Manual

Westinghouse Outdoor Power Equipment, LLC | 23

MAINTENANCE

LONG TERM STORAGE

Even properly stabilized fuel can leave residue and cause 

corrosion if left long term. If storing the generator for two to 

six months, drain the float bowl to prevent gum and varnish 

buildup in the carburetor. 

DRAINING THE FLOAT BOWL

1. 

Turn the fuel tank valve to the OFF position.

2. 

Locate the drain screw on the bottom of the carburetor 

float bowl. 

3. 

Place an appropriate gasoline container under the drain 

screw to catch the drained fuel.

4. 

Loosen the float bowl drain screw and allow the fuel to 

drain. Tighten the float bowl drain screw. 

DRAINING THE FUEL TANK

If storing the generator for longer than six months, drain 

the fuel tank to prevent fuel separation, deterioration, and 

deposits in the fuel system. 

1. 

Unscrew the fuel tank cap. Remove the fuel screen filter 

by slightly compressing it while removing it from the 

tank. 

2. 

Using a commercially available gasoline hand pump 

(not included), siphon the gasoline from the fuel tank 

into an approved gasoline container. DO NOT use an 

electric pump. 

3. 

Reinstall the fuel screen filter and the fuel tank cap. 

4. 

Start the generator and allow it to run until the generator 

engine stops. 

5. 

Push the battery switch to the OFF position. 

6. 

Disconnect the battery quick-connect plugs. 

7. 

Remove the spark plug. 

8. 

Put a teaspoon of engine oil into the cylinder and pull the 

recoil handle until resistance is felt. At this position the 

piston is coming up on its compression stroke and both 

valves are closed. Storing the engine in this position will 

help prevent internal corrosion. Return the recoil handle 

gently.  

9. 

Reinstall the spark plug. Leave the spark plug boot 

disconnected to prevent accidental starting. 

VALVE CLEARANCE

NOTICE

Checking and adjusting valve clearance must be done 

when the engine is cold.

1. 

Remove the rocker arm cover and carefully remove 

the gasket. If the gasket is torn or damaged, it must be 

replaced.

2. 

Remove the spark plug so the engine can be rotated 

more easily.

3. 

Rotate the engine to top dead center (TDC) by pulling 

the recoil handle slowly. Looking through the spark plug 

hole, the piston should be at the top (both valves are 

closed).

4. 

Both the rocker arms should be loose at TDC on the 

compression stroke. If they are not, rotate the engine 

360°.

5. 

Insert a feeler gauge between the rocker arm and the 

valve stem to measure valve clearance.

Intake Valve

Exhaust Valve

Valve Clearance

0.0031 – 0.0047 in 

(0.08 – 0.12 mm)

0.0051 – 0.0067 in 

(0.13 – 0.17 mm)

Torque

8-12 N•m

8-12 N•m

6. 

If an adjustment is necessary, hold the rocker arm pivot 

and loosen the pivot adjusting nut.

7. 

Turn  the  rocker  arm  pivot  to  obtain  the  specified 

clearance. Hold the rocker arm pivot and re-tighten the 

pivot adjusting nut to the specified torque.

Torque: 106 inch-pound (12 N•m)
8. 

Perform this procedure for the other valve.

9. 

Install the gasket, rocker arm cover, and spark plug.