1 SERVICE INFORMATION
1-1 Specifi cations
Dimensions Length mm(in) 448 (17.64)
Width mm(in) 253 (9.96)
Height mm(in) 284 (11.18)
Dry weight* kg(lb) 6.0 (13.2)
Engine Type
YAMABIKO, stratifi ed scavenging, air-cooled, two-stroke,
single cylinder Ventilated piston, Semi-automatic decompression
Rotation Clockwise as viewed from the output end
Displacement cm
3
(in
3
) 54.1 (3.301)
Bore mm(in) 45.0 (1.772)
Stroke mm(in) 34.0 (1.339)
Compression ratio 7.2
Carburettor Type Diaphragm horizontal-draught
Model Walbro WLA-4 with Large D-shaped mixture needles
Venturi size-Throttle bore mm(in) 13.49 - 15.85 (0.531 - 0.624)
Ignition Type CDI (Capacitor discharge ignition) system
Digital magneto
Spark plug BPMR8Y
Exhaust Muffl er type Spark arrester muffl er
Starter Type Automatic rewind
Rope diameter x length mm(in) 4.0 x 950 (0.15 x 37.4)
Fuel Type Premixed two-stroke fuel
Mixture ratio
50 : 1 (2 %)
Petrol Minimum 89 octane petrol
Two-stroke air cooled engine oil ISO-L-EGD (ISO/CD13738), JASO FC/FD
Tank capacity L (U.S.fl .oz.) 0.53 (17.9)
Clutch Type
Inboard clutch : Centrifugal, 3-shoe slide with 3-tension spring
Guide bar / Saw chain lubrication type Automatic with volume adjuster
Tank capacity, oil L (U.S.fl .oz.) 0.3 (10.1)
Sprocket Type Floating rim
Number of teeth 7
Pitch in 0.325, 3/8
* Without guide bar and saw chain.
Oregon Saw chain 21BPX
Cutting devices
Guide bar
Part No. 38RV58-325E 45RV58-325E 50RV58-325E
Called length cm 38 45 50
Gauge in 0.058
Saw chain
Number of drive links 64 72 80
Pitch in 0.325
Gauge in 0.058
SERVICE INFORMATION CS-550
2
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