13
Owner’s Manual
301CC VIPER 4-CYCLE ENGINE
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M-F 8-5 CST
SPARK PLUG
The recommended spark plugs are listed in the Specifications
Section on Page 6.
CHECKING AND CHANGING SPARK PLUG
1. Check spark plug every 50 operating hours.
2. Disconnect the spark plug cap, and clean any debris from
around the spark plug area.
3. Remove spark plug and replace if any of the following
occur; pitted electrodes, burned electrodes, cracked
porcelain, or deposits around electrodes.
4. After analysis, seat spark plug and tighten with spark plug
wrench to compress the sealing washer. SEE FIGURE 9 on
previous page.
• Reinstall original spark plug, tighten additional
1/2 turn.
• Installing new spark plug, adjust spark plug gap to
.030" (0.6-0.7 mm) and tighten additional 1/8 – 1/4 turn.
NOTE: Loose spark plug may overheat and damage
engine. Over tightened spark plug may damage threads in
the cylinder head.
SPARK PLUG MAINTENANCE
Spark plug should be removed, cleaned and gap adjusted after
approximately fifty hours of operating time.
NOTE: A sand blaster should not be used to clean spark
plugs. Microscopic particles remaining in the plug may
score the engine cylinder during operation. Use solvent
and a wire brush to clean the plug and compressed air to
blow out completely.
AIR FILTER
Refer to maintenance schedule for suggestions on when to
service your air filter. Clean filter daily in extremely dusty
conditions.
REMOVING/INSTALLING AIR FILTER. SEE FIGURE11.
1. Remove air cleaner cover.
2. Remove the air filter.
3. Replace with new air filter.
4. Replace air filter cover.
CAUTION
NEVER RUN ENGINE WITHOUT AIR FILTER PROPERLY
INSTALLED. ADDED WEAR AND ENGINE FAILURE MAY
OCCUR IF AIR FILTER IS NOT INSTALLED ON ENGINE.
FIGURE 11
AIR FILTER
COVER
AIR FILTER
ELEMENT
AIR FILTER
BASE
WASH AIR FILTER AS FOLLOWS:
1. Wash in warm water with mild soap until dirt and debris
are removed. Press filter when washing, do not twist.
2. Rinse in warm water until soap and dirt are removed.
3. Dry filter by wrapping in a clean cloth and pressing filter
until it is dry.
CARBURETOR
•
Never tamper with factory setting of the carburetor.
•
If adjustment is needed, contact customer service.
