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CS-550
Oregon Saw chain 73LGX
Cutting devices
Guide bar
Part No.
Called length
Gauge
Saw chain
Number of drive links
Pitch
Gauge
1-2 Technical data
Engine
Idling speed
Wide open throttle speed*
Clutch engagement speed
Minimum
Compression pressure
Ignition system
Spark plug gap
Minimum secondary voltage at 1,500 r/min
Primary coil resistance
Secondary coil resistance
Pole shoe air gaps
Ignition timing
at 3,000 r/min
at 8,000 r/min
at 12,000 r/min
PET-9000
Parameter 1
Parameter 2
Carburettor
Idle adjust screw initial setting
L mixture needle initial setting
H mixture needle initial setting
Test Pressure, minimum
Metering lever height
Chain oil discharge volume at 7,000 r/min
BTDC: Before top dead center.
*With 50 cm guide bar and properly adjusted saw chain.
**Set idle adjust screw to the point that its tip just contacts throttle plate before initial setting.
***Turn L/H mixture needles anticlockwise from point that needle is lightly seated.
†
If clutch engagement speed is lower than minimum r/min, replace clutch assembly with new one.
SERVICE INFORMATION
cm
in
in
in
r/min
r/min
r/min
†
r/min
2
MPa (kgf/cm
) (psi)
mm(in)
kV
Ω
kΩ
mm(in)
°BTDC
°BTDC
°BTDC
turns in**
turns out***
turns out***
2
MPa (kgf/cm
) (psi)
mm(in)
mL/min(U.S.fl .oz./min)
40RV58-3/8E
45RV58-3/8E
40
60
2,800 +/- 200
12,500 - 13,500
1.04 (10.6) (151)
0.6 - 0.7 (0.024 - 0.028)
0.30 - 0.40 (0.012 - 0.016)
0.05 (0.5) (7.0)
1.50 (0.06) lower than diaphragm seat
Adjustable 1.5 - 13 (0.05 - 0.39)
(Factory set 7.0 mL/min)
50RV58-3/8E
45
50
0.058
64
72
3/8
0.058
4,000
3,300
17
300 - 340
2.5 - 2.9
5
24
28
325
03
1 3/8
1 3/8
3 3/8
3
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