Mixing Fuel And Refueling The Brushcutter; Starting And Stopping The Engine - Stihl FR 235 Instruction Manual

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7.2 Removing the Carrying System
► Shut off the engine.
► Loosen the straps.
► Open the buckle on the waist belt.
► Take the trimmer off your back.
8 Mixing Fuel and Refueling
the Brushcutter
8.1 Mixing Fuel
A video is available for this chapter
www.stihl.com/sxpweh
This trimmer requires a fuel mixture of gasoline
and two-stroke engine oil., in a ratio of 50:1.
STIHL recommends you use STIHL MotoMix.
If you mix the fuel yourself, use only STIHL two-
stroke engine oil or another high-performance
engine oil in accordance with JASO FB, JASO
FC, JASO FD, ISO-L-EGB, ISO-L-EGC or ISO-L-
EGD.
STIHL specifies STIHL HP Ultra two-stroke
engine oil or an equivalent high-performance
engine oil in order to maintain emission limits
over the machine's service life.
► Make sure that the octane number of the gas‐
oline is at least 90 RON and the ethanol con‐
tent is not more than 10%.
► Make sure the two-stroke engine oil you are
using meets the requirements.
► Depending on the required amount of fuel,
determine the correct amounts of two-stroke
engine oil and gasoline in a mix ratio of 50:1.
Examples for fuel mixes:
– 1 liter gasoline, 20 ml two-stroke engine oil
– 3 liters gasoline, 60 ml two-stroke engine oil
– 5 liters gasoline, 100 ml two-stroke engine
oil
► Pour two-stroke engine oil into a clean
approved fuel canister first and then add gaso‐
line.
► Thoroughly mix the fuel.
8.2 Fueling the Trimmer
► Shut off the engine.
► Place your trimmer on a level surface so that
the fuel tank cap faces up.
► Use a damp cloth to clean the tank cap and
the area around it.
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8 Mixing Fuel and Refueling the Brushcutter

► Turn the tank cap counterclockwise until it can
be removed.
► Remove the fuel tank cap.
NOTICE
■ Bright light, sunlight and extreme tempera‐
tures can cause the fuel mix to separate much
faster. The trimmer can be damaged if it is
used with a fuel mix that has become separa‐
ted.
► Thoroughly mix the fuel.
► Do not use fuel mix that has been stored for
more than 30 days.
► Fill the tank to within no more than 15 mm
of the brim, taking care not to spill any fuel.
► Fit the tank cap on the tank opening.
► Turn the tank cap clockwise and tighten it
down firmly by hand.
The fuel tank is closed.
9 Starting and Stopping the
Engine
9.1 Selecting the correct starting
procedure
When must the engine be prepared for starting?
The engine must be prepared for starting if one
of the following conditions apply:
– The engine is at ambient temperature.
– The engine stopped when accelerated for the
first time.
– The engine stopped because the fuel tank was
empty.
0458-527-0121-B