Air Filter; Carburetor; Spark Plug Maintenance - Viper 150CC Manuel De L'utilisateur

AIR FILTER

Refer to maintenance schedule for suggestions on when to
service your air filter. Washing filter is not recommended.
When dirty, replace filter.
Removing/Installing Air Filter. SEE FIGURE 5.
1. Remove air cleaner cover.
2. Remove the air filter.
3. Replace with new air filter.
4. Replace air filter cover.
SPARK PLUG
The recommended spark plug is a DK7RTC. The spark plug is
located to the left of the valve cover. SEE FIGURE 4.
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.
• Reinstall original spark plug, tighten additional 1/2
turn.
• Installing new spark plug, adjust spark plug gap to
.024" - .031" (0.6-0.8 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.
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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
base
air filter element

CARBURETOR

• Never tamper with factory setting of the carburetor.
• If adjustment is needed, contact customer service.
FUEL FILTER
CLEANING OR REPLACING FUEL FILTER
1. Disconnect spark plug wire from spark plug. Remove
spark plug.
2. Drain fuel from tank before attempting to clean/replace
filter.
3. Remove hose clamp closest to gas tank.
4. Pull filter out from end of hose.
5. Filter may be washed with kerosene or similar solvent.
6. If filter is extremely dirty or torn, replace with new filter.
7. Reassemble with clean or new filter, and fill with clean,
fresh gasoline. Check for leaks prior to starting engine.
Owner's Manual
150CC VIPER 4-CYCLE ENGINE
air cleaner
cover
FIGURE 5