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7. Check that the spark plug washer is in good condition
8. Thread the spark plug in by hand to prevent cross-
threading.
9. After the spark plug is seated, tighten with a spark plug
wrench to compress the washer.
NOTE: When installing a new spark plug, tighten ⁄ turn
after the spark plug seats to compress the washer. When
reinstalling a used spark plug, tighten ⁄-⁄ turn after the
spark plug seats to compress the washer.
NOTE: The spark plug must be securely tightened. An
improperly tightened spark plug can become very hot and
may damage the engine.
Air Filter
NOTE: Not all engines have air filters, such as engines used for
snow throwers. Service the air filter if one is present.
Paper filters cannot be cleaned and must be replaced once a
year or every 10 operating hours; more often if used in extremely
dusty conditions.
WARNING! Never use gasoline or low flash point
solvents for cleaning the air cleaner element. A fire
or explosion could result.
NOTE: Never run the engines that have air filters without them.
Rapid engine wear can result.
1. Press the tab on the air filter cover and lift the cover, or
un-thread the thumbscrews, depending on the model of
engine you have. See Fig. 6-4.
Figure 6-4
2. Replace paper element when dirty or damaged. Clean
foam element or replace when damaged.
3. To clean foam element, separate it from the paper element
and wash in liquid detergent and water. Allow to dry
thoroughly before using. Do not oil the foam element.
Adjustments
DO NOT make any engine adjustments. Factory settings are
satisfactory for most conditions. If adjustments are needed,
contact your Authorized Servicing Dealer.
Carburetor
If you think you carburetor needs adjusting, see your nearest
Authorized Servicing Dealer. Engine performance should NOT be
affected at altitudes up to 7,000 feet (2,134 meters). For operation
at higher elevations, contact your Authorized Servicing Dealer
Alternator (if equipped)
Contact your Authorized Servicing Dealer for alternator related
electrical problems such as:
• Inoperative Starter
• Discharged Battery
• Fuse Replacement
• Alternator Maintenance/Repairs
Engine Speed
WARNING! To avoid serious injury or death, DO
NOT modify engine in any way. Tampering with the
governor setting can lead to a runaway engine and
cause it to operate at unsafe speeds. NEVER tamper
with the factory setting of the engine governor.
WARNING! Running the engine faster than the
speed set at the factory can be dangerous and will
VOID THE ENGINE WARRANTY.
Removing Snow from the Engine
After each use, remove snow from the following areas:
• Oil Fill Cap Dipstick
• Fuel Fill Cap
• Recoil Starter/Flywheel Screen
• Linkage
• Guards
• Spark Plug Connection (if visible).
• Electric Starter Switch Box, if present (see the
equipment Operator’s Manual instructions).
NOTE: See the equipment Operator’s Manual instructions
for proper location of fuel fill cap and control lever.
1. Removing snow will ease operation of the recoil starter
rope and reduce the risk of water contamination when
opening the fuel fill cap.
NOTE: For more information about recoil starters, see
Engine’s with Recoil Starters in the Operation Section of
this manual.
15Section 6 — Maintenance
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