Harness; Fuel - Stihl SR 420 Instruction Manual

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Harness

Attaching the Harness
Attach strap hook to the backplate.
N
Adjusting the Harness
Pull the ends of the straps
N
downward to tighten the harness.
10
Loosening the Harness
Lift the tabs of the sliding adjusters.
N
Adjust the harness so that the
N
backplate fits snugly and securely
against your back.
Throwing Off Machine
Before using the machine, make
yourself familiar with how to release and
throw off the backpack.
In an emergency, quickly throw the
machine off your back as follows:
Open the quick-release fastener on
N
the waist belt (special accessory).
Open the strap hook on the
N
backplate by snapping it forwards
(arrow).
Throw the machine to the rear.
N

Fuel

Your engine requires a mixture of
gasoline and engine oil.
WARNING
For health reasons, avoid direct skin
contact with gasoline and avoid inhaling
gasoline vapor.
STIHL MotoMix
STIHL recommends the use of STIHL
MotoMix. This ready-to-use fuel mix
contains no benzol or lead, has a high
octane rating and ensures that you
always use the right mix ratio.
STIHL MotoMix uses STIHL HP Ultra
two-stroke engine oil for an extra long
engine life.
MotoMix is not available in all markets.
Mixing Fuel
NOTICE
Unsuitable fuels or lubricants or mix
ratios other than those specified may
result in serious damage to the engine.
Poor quality gasoline or engine oil may
damage the engine, sealing rings, hoses
and the fuel tank.
Gasoline
Use only high-quality brand-name
gasoline with a minimum octane rating
of 90 – leaded or unleaded.
SR 420