INTRODUCTION
5
• No oil additives or viscosity modifiers are recom-
mended. The performance of a good oil meeting
the API specifications will not be improved by oil
additives.
NOTE: Some oil additives may cause severe
and non warrantable engine damage, constitut
-
ing a lubrication failure.
Changing the oil
NOTE: If the engine has been running, allow the
engine to cool before doing any maintenance
work.
NOTE: The oil should be changed after the first
5 hours of operation and every 50 hours there
after.
1. Place a suitable drain pan under the drain plug
to collect the oil.
2. Drain the oil by removing the drain plug located
at the end of the extension pipe threaded into
the base of the engine, using a 10mm wrench.
See Figure 1.4.
3. When all of the oil has drained out, reinstall the
drain plug. Tighten the drain plug to a torque of
106-124 in-lbs (12-14 Nm).
4. Fill the engine with 37 fl.oz (1.1 liters) of fresh,
clean SAE 5W-30 oil with a SF/SG shroud API
rating or better.
5. Safely dispose of the used oil according to the
local laws and regulations.
Figure 1.4
Oil drain
Fuel
Gasolines currently on the market are not pure gas.
Today’s fuels have alcohol and other additives in them
to reduce emissions. The fuel make up can vary sea
-
sonally and geographically.
Fuel with alcohol added to it is sometimes referred
to as “oxygenated fuel”. The extra oxygen carried by
the ethanol increases the oxidation of the fuel. This
speeds up the process that causes the fuel to go bad.
Excessive alcohol in fuel creates a lot of problems
for gasoline engines. One of the biggest problems is
that alcohol attracts and holds water. This corrodes the
metal components of the fuel system, especially the
carburetor. Alcohol also does not produce as much
heat as gasoline when burnt. This results in less power
for the engine.
A 10% alcohol mix (E10) is acceptable for MTD
engines. Anything higher than that will result in perfor
-
mance issues.
NOTE: E85 and E20 fuels are not to be used in
any MTD engines.
1. Use clean, fresh fuel with a pump octane rating
of 87 or greater.
• Stale or out-of-date fuel is the leading cause of
hard starting issues.
• In areas that have high amounts of alcohol in
their fuel, high octane fuel may improve engine
performance and startability.
Fuel filters
Dirty fuel can clog the carburetor and introduce abra-
sive materials into the engine. To help prevent that,
MTD engines are equipped with a fuel filter. The fuel fil
-
ter is part of the fuel tank nipple. See Figure 1.5.
Figure 1.5
fuel filter
Nipple
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