Replacing The Spark Plug; Battery Replacement (If Applicable); Service Air Cleaner; Clean Spark Arrestor Screen (Carb Models) - Generac Power Systems GP Series Owner's Manual

Maintenance
Hot oil may cause burns. Allow engine to

cool before draining oil. Avoid prolonged
or repeated skin exposure with used oil.
Thoroughly wash exposed areas with soap.
Use the following instructions to change the oil after the engine
cools down:
• Clean area around oil drain plug.
• Remove oil drain plug from engine and oil fill plug to drain oil
completely into a suitable container.
• When oil has completely drained, install oil drain plug and
tighten securely.
• Fill oil sump with recommended oil. (See "Before Starting the
Generator" for oil recommendations).
• Wipe up any spilled oil.
• Dispose of used oil at a proper collection center.

3.4.6 REPLACING THE SPARK PLUG

See Engine Specifications for recommended spark plug. 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
(Figure 16).
Figure 16 - Spark Plug Gap

3.4.7 BATTERY REPLACEMENT (IF APPLICABLE)

The battery shipped with the generator has been fully charged.
A battery may lose some of its charge when not in use for
prolonged periods of time. If the battery is unable to crank
the engine, plug in the 12V charger included in the accessory
box (see the Charging a Battery section). RUNNING THE
GENERATOR DOES NOT CHARGE THE BATTERY. The part
number for this battery is 0G9449.
The NEGATIVE battery terminal should:

1. Always be DISCONNECTED FIRST.
2. Always be CONNECTED LAST.
14
NOTE:
Figure 17 - Battery Connections

3.5 SERVICE AIR CLEANER

The engine will not run properly and may be damaged if using
a dirty air cleaner. Clean or replace the air cleaner paper filter
once a year. Clean or replace more often if operating under dusty
conditions (Figure 18). The air filter part number is 0G84420151.
To clean or replace paper air filter:
• Remove air cleaner cover and remove paper filter.
• Clean paper filter by tapping it gently on a solid surface. If the
filter is too dirty, replace it with a new one. Dispose of the old
filter properly.
• Clean air cleaner cover, then insert new paper filter into the base
of the air cleaner. Re-install air cleaner cover.
Figure 18 - Air Filter
3.5.1 CLEAN SPARK ARRESTOR SCREEN (CARB
MODELS)
The engine exhaust muffler has a spark arrestor screen. Inspect
and clean the screen at least once each year (Figure 19). If unit is
used regularly, inspect and clean more often.
If using the generator on any forest-covered,

brush-covered or grass-covered unimproved
land, it must equipped with a spark arrestor.
The spark arrestor must be maintained in good
condition by the owner/operator.