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10 Mixing Fuel and Refueling the Trimmer / Brushcutter
10.1 Mixing Fuel
Information on Fuel
Your engine requires a mixture of high-quality gasoline and
2-cycle air cooled engine oil. This engine is certified to
operate on mid-grade unleaded gasoline with a minimum
octane rating of 89 and no more than 10 % ethanol and
2-cycle oil for air cooled engines at a mix ratio of 50:1.
If you mix the fuel yourself, STIHL recommends STIHL HP
Ultra 2-Cycle Engine Oil.
NOTICE
Fuel with an octane rating below 89 may increase engine
temperatures. This, in turn, increases the risk of piston
seizure and damage to the engine. The chemical
composition of the fuel is also important.
NOTICE
Some fuel additives not only detrimentally affect elastomers
(carburetor diaphragms, oil seals, fuel lines, etc.), but
magnesium castings and catalytic converters as well. This
could cause running problems or damage the engine. For
this reason STIHL recommends that you use only quality
unleaded gasoline.
Information on Ethanol Content
WARNING
At correct idle speed, the cutting attachment should not
move. To reduce the risk of personal injury from loss of
control and/or contact with the rotating cutting attachment,
have the trimmer / brushcutter inspected by an authorized
STIHL servicing dealer before further use if the cutting
attachment moves while the engine is idling.
Gasoline with an ethanol content of more than 10% can
cause running problems and major damage in engines and
should not be used. For further details, see
www.STIHLusa.com/ethanol.
The ethanol content in gasoline affects engine speed. It may
be necessary to readjust the carburetor if you use fuels with
varying ethanol content.
The idle speed and maximum speed of the engine change if
you switch to a fuel with a much higher or lower ethanol
content. This problem can be avoided by always using an
ethanol-free fuel or fuel with consistent ethanol levels.
STIHL MotoMix
STIHL MotoMix is ethanol-free, has a high octane rating and
ensures that you always use the right gasoline/oil mix ratio.
STIHL MotoMix uses STIHL HP Ultra 2-Cycle Engine Oil
suited for high performance engines. For further details, see
www.STIHLusa.com/ethanol.
STIHL recommends using MotoMix in your trimmer /
brushcutter. If not using MotoMix, use only STIHL HP Ultra
2-Cycle Engine Oil or equivalent high quality 2-cycle engine
oils that are designed for use in air cooled 2-cycle engines.
The use of non-seasonal gasoline blends may increase the
potential for pressure to build in the fuel tank during
operation. For example, using a winter blend during the
summer will increase pressure in the fuel tank. Always use
gasoline blends appropriate to the season, altitude and
other environmental factors.
Do not use NMMA or TCW rated (2-cycle water cooled) mix
oils or other mix oils that state they are for use in both water
cooled and air cooled engines (e.g., outboard motors,
snowmobiles, chain saws, mopeds, etc.).
Mixing Fuel
WARNING
Take care when handling gasoline. Avoid direct contact with
the skin and avoid inhaling fuel vapor. Anytime you are filling
a container at the fuel pump, remove the container from your
vehicle and place it on the ground before filling. To reduce
the risk of sparks from static discharge and resulting fire
and/or explosion, do not fill fuel containers that are sitting in
or on a vehicle or trailer.
10 Mixing Fuel and Refueling the
Trimmer / Brushcutter
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