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12-2
161
1
5
Figure 12-1
ENGINE
LUBRICATION
Since fuel vapors are first compressed in the crankcase of the two-
cycle engine,
the
most practical method of lubrication is by mixing the
lubricant with the gasoline.
As the mixture of lubricant and gasoline
enters the crankcase, the gasoline is vaporized, leaving the
lubricant
to
lubricate the bearings and other moving parts. Eventually the lubricant
reaches the combustion chamber where it is burned and discharged
through the exhaust ports.
In this way the fuel mixture conveys to the
engine's moving parts a metered amount of lubricant
in
proportion to
the speed of the engine.
Both
optimum performance and lubrication depend on maintaining the
correct ratio between gasoline and lubricant
in
the fuel mixture.
The
use of too little
lubricant
leads to premature wear and early break-
down.
A fuel mixture
richer
in lubricant
than recommended
is not only
wasteful but will contribute to faulty performance, and to excessive
carbon accumulation in the cylinders and on the
spark
plugs.
Frequent
spark
plug replacement can often be traced to an excess of lubricant in
the fuel mixture.
Instructions for the mixing of fuel during break-in
and normal operation as given here and in the Owner's Manual
should
be followed exactly.
FUELS AND
LUBRICANTS
The use of an OMC brand 24:1 lubricant or a reputable automotive
engine oil
,
SAE 30 SD or SB, and a non -premium gasoline of like
quality, is recommended. The oil container should be marked Service
SB or Service
SD.
Additional markings, such as SA-SB, or CA indicate
oils for other applications and should be avoided. Avoid the use of
low-priced, light duty oil (container marked only
with
SA deSignation)
or multiple viscosity oils such as SAE 10W30. EVEN THOUGH OMC
BRAND OUTBOARD LUBRICANT IS ADVERTIZED AS A 50:1 RATIO
LUBRICANT, IT IS
IMPERATIVE
FOR SNOWMOBILE USE THAT IT
BE MIXED AT 24:1 GAS-LUBRICANT RATIO.
The use of higher priced, premium gasolines is not recommended; the
compression ratio of the engine is not high enough to warrant the use of
such fuel.
In addition, the lead and other additives which are used to
increase the octane rating of premium gasolines, or otherwise improve
performance, may
shorten spark
plug life.
The use of additive compounds, such as tune-up compounds, toniCS,
friction reducing compounds, etc., is discouraged.
OMC Accessories
Engine Cleaner and OMC Accessories
Break-In
Lubricant should be
used as necessary according to instructions.
OMC 2+4 FUEL CONDITIONER
OMC 2+4 Fuel Conditioner is recommended for added protection to
your snowmobile engine.
It
is especially recommended as an additive
between extended periOds of snowmobile use.
OMC 2+4 Fuel Condi-
tioner is available from your dealer.
OMC 2+4 Fuel Conditioner features are as follows:
•
Fuel Stabilizer - prevents formation of gum and varnish deposits in
fuel system for one year of storage. Eliminates need for draining
fuel for
storage.
•
Carburetor Cleaner
-
dissolves gum and varnish deposits in carbu-
retor and fuel system.
•
CorrOSion Resistance - protects carburetor, fuel
system
and
in-
~
ternal engine parts from corrosion.
•
De-icer - prevents carburetor icing and gas line freezeup.
•
Absorbs moisture and water in fuel
system.
•
Extends spark plug life by reducing fouling and misfire.
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