SERVICE INFORMATION
CS-370ES
CS-420ES
2
1 SERVICE INFORMATION
1-1 Specifications
Model CS-370ES CS-420ES
Dimensions Length* mm(in) 393 (15.5)
Width mm(in) 245 (9.6)
Height mm(in) 277 (10.9)
Dry weight* kg(lb) 4.6 (10.1) 4.6 (10.1)
Engine Type KIORITZ, air-cooled, two-stroke, single cylinder
Rotation Clockwise as viewed from the output end
Displacement cm
3
(in
3
) 36.3 (2.22) 40.2 (2.45)
Bore mm(in) 38.0 (1.50) 40.0 (1.58)
Stroke mm(in) 32.0 (1.26) 32.0 (1.26)
Compression ratio 7.6 6.5
Carburetor Type Diaphragm horizontal-draft, with auto-return choke**
Model Walbro WT-820A
Venturi size-Throttle bore mm(in) 13.5 - 15.85 (0.532 - 0.624)
Ignition Type Digital magneto : CDI system
Spark plug BPMR8Y
Starter Type ES (effortless)-start
Rope diameter x length mm(in) 3.0 x 950 (0.12 x 37.4)
Fuel Type Premixed two-stroke fuel
Mixture ratio 50 : 1 (2 %)
Gasoline Minimum 89 octane gasoline
Two-stroke air cooled engine oil ISO-L-EGD (ISO/CD13738), JASO M345-FC/FD
Tank capacity L (U.S.fl.oz.) 0.41 (13.9)
Clutch Type Centrifugal, 3-shoe slide with 3-tension spring
Guide bar / Saw chain lubrication type Automatic with volume adjuster
Oil Tank capacity L (U.S.fl.oz.) 0.28 (9.5)
Auto oiler type Clutch related type
Sprocket Type Spur
Number of teeth 6 7
Pitch in 3/8 0.325
* Without guide bar and saw chain.
** Auto-return choke is on switch bracket.
Cutting devices CS-370ES
Guide bar Part No. 30RC50M-3/8 35RC50M-3/8
Called length cm 30 35
Gauge in 0.050
Saw chain Type OREGON 91VG
Number of drive links 47 53
Pitch in Low profile 3/8
Gauge in 0.050
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