Operator's Manual
Viper® 99cc 4-Cycle Engine
14
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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 FIGURE 10)
1. Remove air cleaner cover.
2. Remove the air filter.
3. Replace with clean or new air filter.
4. Replace air filter cover.
Washing air Filter
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.
4. Oil filter thoroughly with any common household lubricating oil.
5. Attach the filter and air cleaner cover to the engine.
SPaRk PlUG
The recommended spark plug is a LG E5TC. The spark plug is
located directly under the muffler.
SEE FIGURE 11
Checking and Changing Spark Plug
1. Check spark plug every 50 operating hours.
NOTE: To make the spark plug more accessible, the muffler
may be removed.
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 11
• Reinstall original spark plug, tighten additional 1/2 turn.
• Installing new spark plug, adjust spark plug gap to .030”
(0.7-0.8 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 it out thoroughly.
WaRNING
FUEl IS HIGHlY FlammaBlE aND mUST BE HaNDlED
WITH CaRE. NEVER FIll THE TaNk WHEN THE ENGINE
IS HOT OR RUNNING. alWaYS mOVE OUTDOORS TO
FIll FUEl TaNk.
CaUTION
NEVER RUN ENGINE WITHOUT aIR FIlTER PROPERlY
INSTallED. aDDED WEaR aND ENGINE FaIlURE maY
OCCUR IF aIR FIlTER IS NOT INSTallED ON ENGINE.
air cleaner
screen
air cleaner cover
air filter
element
air cleaner
base
FIGURE 11
FIGURE 10
