Fueling - Stihl MS 650 Instruction Manual

Gasoline with an ethanol content of
more than 10% can cause running
problems in engines with a manually
adjustable carburetor and should not be
used in such engines.
Engines equipped with M-Tronic deliver
full power when run on gasoline with an
ethanol content of up to 25% (E25).
Engine Oil
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.
Mix Ratio
STIHL 50:1 two-stroke engine oil: 50
parts gasoline to 1 part oil
Examples
Gasoline STIHL engine oil 50:1
Liters Liters (ml)
1 0.02 (20)
5 0.10 (100)
10 0.20 (200)
15 0.30 (300)
20 0.40 (400)
25 0.50 (500)
Use a canister approved for storing
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fuel. Pour oil into canister first, then
add gasoline and mix thoroughly.
MS 650, MS 660
Storing Fuel
Store fuel only in approved safety-type
fuel canisters in a dry, cool and safe
location protected from light and the sun.
Fuel mix ages – only mix sufficient fuel
for a few weeks work. Do not store fuel
mix for longer than 30 days. Exposure to
light, the sun, low or high temperatures
can quickly make the fuel mix unusable.
STIHL MotoMix may be stored for up to
2 years without any problems.
Thoroughly shake the mixture in the
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canister before fueling your
machine.
WARNING
Pressure may build up in the canister –
open it carefully.
Clean the fuel tank and canister
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from time to time.
Dispose of remaining fuel and cleaning
fluid properly in accordance with local
regulations and environmental
requirements.

Fueling

Preparing the machine
Before fueling, clean the filler cap
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and the area around it so that dirt
cannot fall into the tank.
Always position the machine so that
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the filler cap is facing upwards
Open the filler cap
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Refueling
Take care not to spill fuel while fueling
and do not overfill the tank.
STIHL recommends use of the STIHL
filling system for fuel (special
accessory).
WARNING
After fueling, tighten down the filler cap
by hand as securely as possible.
Use a suitable tool (e. g., screwdriver of
the combination wrench) for slotted filler
caps.
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