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Vanguard Single Cylinder Manual

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1
ENGINE MAINTENANCE
Fuel and Oil Recommendations
Fuel
Fuel must meet these requirements:
• Use clean, fresh unleaded gasoline.
• A minimum of 87 octane / 87 AKI (91
RON). For high altitude use, see “High
Altitude” below.
• Gasoline with up to 10% ethanol
(gasohol) or up to 15% MTBE (Methyl
Tertiary Butyl Either) is acceptable.
CAUTION: Do not use unapproved gasoline
such as E85. Do not mix in gasoline or modify
the engine to run on alternate fuels. This will
damage the engine components and void the
engine warranty.
To protect the fuel system from gum formation,
mix a fuel stabilizer into the gasoline see
“Storage” below. All fuel is not the same.
If starting or performance problems occur:
• Change fuel providers or change brands.
High Altitude
At altitudes over 5000 feet (1524 meters), a
minimum of 85 octane / 85 AKI (89 RON)
gasoline is acceptable. To remain emissions
compliant, high altitude adjustment is required.
Operation without this adjustment will cause
decreased performance, increased fuel
consumption and increased emissions.
At altitudes below 2500 feet (762 meters), high
altitude adjustment is not recommended.
Storage
Fuel can become stale when stored over 30
days. Stale fuel causes acid and gum deposits to
form in the fuel system and/or on essential
carburetor parts. To keep fuel fresh, use Briggs
& Stratton FRESH START™ (#5041) fuel
stabilizer, available as a liquid additive or a drip
concentrate cartridge.
There is no need to drain gasoline from the
engine before storage if fuel stabilizer is added
according to instructions. Run the engine for two
minutes to circulate the stabilizer throughout the
system. The engine and fuel can then be stored
for up to 24 months.
If gasoline has not been treated with a fuel
stabilizer prior to storage, it must be drained from
the engine into an approved container. Run the
engine until it stops from lack of fuel. The use of
a fuel stabilizer in the storage container is
recommended to maintain freshness.
CAUTION: Some fuel, called “oxygenated” or
“reformulated” gasoline, is gasoline blended with
alcohol or ether. Excessive amounts of these
blends can damage the fuel system or cause
performance problems. If any undesirable
operating symptoms occur, use gasoline with a
lower percentage of alcohol or ether.
Oil
Oil has four purposes:
• It cools
• It cleans
• It seals
• It lubricates
During normal operation, small particles of metal
from the cylinder walls, pistons, bearings as well
as normal combustion deposits will gradually
contaminate the oil. Dust particles from the air
also contaminate the oil. This forms an abrasive
mixture that can cause wear to the internal parts
of the engine if the oil is not changed regularly.
Fresh oil also assists in cooling. Old oil gradually
becomes thick and loses its cooling ability as
well as its lubricating qualities.
Use a high quality detergent oil classified “For
Service SF, SG, SH, SJ” or higher. Use synthetic
oil such as Briggs & Stratton (#100074) or
equivalent. If synthetic oil is not available, Briggs
& Stratton non-synthetic 30 weight oil (#100005 or
#100028) is an acceptable substitute. Do not use
special additives with recommended oils.
Do not mix oil with gasoline.
… 11 …


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