1-2 Technical data
Engine
Idling speed r/min 2,800 +/- 200
Wide open throttle speed* r/min 12,500 - 13,500
Clutch engagement speed r/min 4,000
Minimum
†
r/min 3,300
Compression pressure MPa (kgf/cm
2
) (psi) 1.04 (10.6) (151)
Ignition system
Spark plug gap mm(in) 0.6 - 0.7 (0.024 - 0.028)
Minimum secondary voltage at 1,500 r/min kV 17
Primary coil resistance Ω 300 - 340
Secondary coil resistance kΩ 2.5 - 2.9
Pole shoe air gaps mm(in) 0.30 - 0.40 (0.012 - 0.016)
Ignition timing at 3,000 r/min °BTDC 5
at 8,000 r/min °BTDC 24
at 12,000 r/min °BTDC 28
PET-9000 Parameter 1 325
Parameter 2 03
Carburettor
Idle adjust screw initial setting turns in** 1 3/8
L mixture needle initial setting turns out*** 1 3/8
H mixture needle initial setting turns out*** 3 3/8
Test Pressure, minimum MPa (kgf/cm
2
) (psi) 0.05 (0.5) (7.0)
Metering lever height mm(in) 1.50 (0.06) lower than diaphragm seat
Chain oil discharge volume at 7,000 r/min Adjustable 1.5 - 13 (0.05 - 0.39)
mL/min(U.S.fl .oz./min) (Factory set 7.0 mL/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.
Oregon Saw chain 73LGX
Cutting devices
Guide bar
Part No. 40RV58-3/8E 45RV58-3/8E 50RV58-3/8E
Called length cm 40 45 50
Gauge in 0.058
Saw chain
Number of drive links 60 64 72
Pitch in 3/8
Gauge in 0.058
SERVICE INFORMATIONCS-550
3
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