Fuel - Stihl HL 94 Instruction Manual

Mounting the Gearbox
11
10
10
5
Loosen the clamp screws (10).
N
Push the gearbox (11) onto the
N
drive tube (5), turn the gearbox (11)
back and forth as necessary.
HL 94
11
12
Once the end of the drive tube is
inserted beyond the slot in the
clamp (12):
Push the gearbox (11) fully home as
N
far as stop.
Tighten down the clamp screws
N
moderately.
Line up the gearbox (11) with the
N
powerhead.
Tighten down the clamp screws
N
firmly.

Fuel

This engine is certified to operate on
unleaded gasoline and the STIHL two-
stroke engine oil at a mix ratio of 50:1.
Your engine requires a mixture of high-
quality gasoline and two-stroke air
cooled engine oil.
Use mid-grade unleaded gasoline with a
minimum octane rating of 89 ((R+M)/2)
and no more than 10% ethanol content.
Fuel with a lower octane rating 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. 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 even
damage the engine. For this reason
STIHL recommends that you use only
high-quality unleaded gasoline!
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 running speed – it may be
necessary to readjust the carburetor if
you use fuels with various ethanol
contents.
English
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