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Stihl FS 56 Service Manual

Stihl FS 56
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9Series 4144 Components FC, FS, KM
4.3 Ignition System
Exercise extreme caution while
carrying out maintenance and
repair work on the ignition system.
The high voltages which occur can
cause serious or fatal accidents.
Condition Cause Remedy
Engine runs roughly, misfires,
temporary loss of power
Spark plug boot is loose Press boot firmly onto spark plug
and fit new spring if necessary
Spark plug sooted, smeared with oil Clean the spark plug or replace if
necessary.
If sooting keeps recurring, check air
filter
Fuel/oil mixture
– too much oil
Use correct mixture of fuel and oil
Incorrect air gap between ignition
module and flywheel
Set air gap correctly
Flywheel cracked or has other
damage or pole shoes have turned
blue
Install new flywheel
Ignition timing wrong, flywheel out
of adjustment, key on crankshaft
has sheared off
Locate flywheel properly or install
new flywheel
Weak magnetization in flywheel Install new flywheel
Irregular spark Check operation of switch shaft/
contact springs and ignition
module.
Faulty insulation or break in ignition
lead or short circuit wire. Check
ignition lead/ignition module and
replace ignition module if
necessary.
Check operation of spark plug.
Clean the spark plug or replace if
necessary.
Crankcase damaged (cracks) Install new crankcase

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Stihl FS 56 Specifications

FS 56

Power IconPower
engine power0.8 kW (1.1 hp)
max output shaft speed8600 rpm
idle speed2800 rpm
Engine Specifications IconEngine Specifications
displacement27.2 cm³
cylinder bore34 mm
piston stroke30 mm
Fuel System IconFuel System
fuel tank capacity340 cm³ (0.34 l)
carburetor typeAll-position diaphragm carburetor with integral fuel pump
Noise and Vibration Data IconNoise and Vibration Data
sound pressure level with mowing head93 dB(A)
sound pressure level with metal tool94 dB(A)
sound power level107 dB(A)
Ignition System IconIgnition System
spark plugNGK CMR 6 H, BOSCH USR 4AC
electrode gap0.5 mm
ignition typeElectronic magneto ignition
Weight and Dimensions IconWeight and Dimensions
weight5.1 kg

FS 56 R

Noise and Vibration Data IconNoise and Vibration Data
sound pressure level with mowing head93 dB(A)
sound pressure level with metal tool94 dB(A)
sound power level107 dB(A)
Weight and Dimensions IconWeight and Dimensions
weight4.7 kg

FS 56 C

Noise and Vibration Data IconNoise and Vibration Data
sound pressure level with mowing head93 dB(A)
sound pressure level with metal tool94 dB(A)
sound power level107 dB(A)
Weight and Dimensions IconWeight and Dimensions
weight5.2 kg

FS 56 RC

Noise and Vibration Data IconNoise and Vibration Data
sound pressure level with mowing head93 dB(A)
sound pressure level with metal tool94 dB(A)
sound power level107 dB(A)
Weight and Dimensions IconWeight and Dimensions
weight4.8 kg

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