Generac 5789 Benutzerhandbuch

Use spark plug F6TC, NGK BPR4ES or Champion RN14YC. 
Replace the plug once each year. This will help the engine 
start easier and run better.

1.  Stop the engine and pull the spark plug wire off of the spark plug.
2.  Clean the area around the spark plug and remove it from the 

cylinder head.

3.  Set the spark plug's gap to 0.70-0.80 mm (0.028-0.031 in). Install 

the correctly gapped spark plug into the cylinder head and torque 
to 15 ft/lbs. (Figure 12).

1.  Shut off generator and allow the engine and muffler to cool down 

completely before servicing spark arrestor (located on the back 
of the muffler).

2.  Remove the clamp and spark arrestor screen.
3.  Clean the spark arrestor screen with a small wire brush.
4.  Replace the spark arrestor if it is damaged.
5.  Installation of the spark arrestor screen is the reverse of the 

removal.

The engine will not run properly and may be damaged if using a dirty 
air filter. Clean the air filter once a year (Figure 13). Clean or replace 
more often if operating under dusty conditions.

1.  Remove air filter cover.
2.  Wash in soapy water. Squeeze filter dry in clean cloth (DO NOT 

TWIST).

3.  Clean air filter cover before re-installing it.

•  Intake — 0.10 ± 0.02 mm (cold), (0.004" ± 0.001" in)
•  Exhaust — 0.15 ± 0.02 mm (cold) (0.006" ± 0.001" in)

Important: If feeling uncomfortable about doing this procedure or 
the proper tools are not available, please take the generator to the 
nearest service center to have the valve clearance adjusted. This is a 
very important step to ensure longest life for the engine.

The generator should be started at least once every 30 days and be 
allowed to run at least 30 minutes. If this cannot be done and the unit 
must be stored for more than 30 days, use the following information 
as a guide to prepare it for storage.

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