Operator’s Manual
Viper® 99cc 4-Cycle Engine
13
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ENGINE maINTENaNCE
For daily maintenance checks, review “pre-operation inspection”
section.
lubrication
Choose engine oil that meets or surpasses the latest API service
classification. Synthetic oils may be substituted for petroleum-
based oils in extreme temperatures. For temperatures higher
than 32
º
F, use SAE 30 or SAE 10W-30 motor oil. Use SAE 5W-30
or SAE 10W if temperatures are below 32
º
F.
DO NOT USE SaE
10W-40 mOTOR OIl.
Oil maintenance
After the first 20 hours, or after the first month of operating
a new Viper® Engine the oil should be replaced, and every 50
hours of operating time thereafter. The oil should be changed
every 25 hours if used under severe conditions, such as in high
temperatures or under heavy loads, otherwise changed weekly.
Check oil periodically; do not overfill.
Changing Oil
Be sure the engine is not operating and is located on a level
surface before checking or refilling oil. Engine should be warm
for easy removal of oil.
1. Detach spark plug wire and move away from spark plug. If
the engine uses a battery, disconnect at negative terminal.
SEE FIGURE 8
2. Remove oil drain plug and empty oil into suitable oil
container. Dispose of oil properly.
SEE FIGURE 9
3. Reinstall drain plug. Remove dipstick (if applicable) or oil fill
cap.
SEE FIGURE 9
4. Fill with appropriate oil to “FULL” or top line of dipstick;
otherwise to top thread of oil fill hole.
SEE FIGURE 9
5. Reinsert dipstick or oil fill cap and tighten.
CaUTION
OIl IS HaZaRDOUS WaSTE
aVOID INJURY! ENGINE OIl IS HaZaRDOUS TO YOUR
HEalTH. DISPOSE OF OIl aPPROPRIaTElY. USE a
SaFE DISPOSal/RECYClING CENTER.
CaUTION
RUNNING ENGINE WITH aN lOW OIl lEVEl WIll
CaUSE DamaGE TO YOUR ENGINE. THIS TYPE OF
DamaGE IS NOT COVERED UNDER WaRRaNTY.
FIGURE 8
spark plug cap/wire
spark plug
upper level
lower level
oil fill area/
dipstick
oil drain plug
FIGURE 9
