Subaru Robin EH90 - Manual (Page 12)

12
each year, whichever comes fi rst. This will help the engine to
start easier and run better.
1 Stop the engine and pull the spark plug wires off of the
spark plugs.
2 Clean around the spark plugs and remove them from the
cylinder head.
3 Set the spark plug gap (Figure 10) to 1.1 mm (0.043 in).
Install a correctly gapped spark plugs into the cylinder
head.
Figure 10
CLEANING SPARK ARRESTOR SCREEN
If the engine exhaust muffl er has a spark arrestor screen,
inspect and clean the screen every 100 hours of operation or
once each year, whichever comes fi rst.
NOTE: If using the engine on any forest-covered, brush-
covered or grass-covered unimproved land, it
must have a spark arrestor. The spark arrestor
must be maintained in good condition by the
owner/operator.
Clean and inspect the spark arrestor screen as follows:
Inspect the screen and replace if it is torn, perforated or other-
wise damaged. DO NOT USE a defective screen. If the screen
is not damaged, clean it with a commercial solvent.
If the spark arrestor is found to be damaged or worn out,
replace it.
SERVICE AND ADJUSTMENTS
ENGINE SPEED
The operating speed of this engine is maintained by a mechani-
cally controlled governor. DO NOT try to adjust the governed
speed setting for the following reasons:
Figure 8 - Flat Top Air Cleaner
Canister Style Air Cleaner
• Remove air cleaner cover.
• Empty dust out of cover.
• Gently pull fi lter out of air cleaner housing.
• Clean inside of housing with damp cloth.
• Push new air fi lter into housing.
• Reinstall the air cleaner cover.
Figure 9 - Canister Style Air Cleaner
REPLACING AND CLEANING THE SPARK PLUGS
Clean and adjust the spark plug gap every 50 hours of opera-
tion. Replace the plugs every 500 hours of operation or once
COVER
AIR FILTER
ELEMENT,
PRIMARY
HOUSING
AIR FILTER
ELEMENT,
SAFETY