01-36D-02 CS INTRODUCTION. Reference No D-02 ISSUED:

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1 01-36D-02 CS INTRODUCTION We are constantly working on technical improvement of our products. For this reason, technical data, equipment and design are subject to change without notice. All specifications, illustrations and directions in this SERVICE DATA are based on the latest products information available at the time of publication. CONTENTS page 1 SERVICE INFORMATION Specification Technical data Torque limits Special repairing materials Service limits Special tools EMISSION ADJUSTMENT GUIDE General adjusting rules Presetting idle adjust screw, L mixture needle and H mixture needle Adjusting carburetor... 9 Reference No D-02 ISSUED:

2 2 SERVICE INFORMATION CS SERVICE INFORMATION 1-1 Specifications Model CS-370 Dimensions Length* mm(in) 393 (15.5) Width mm(in) 245 (9.6) Height mm(in) 277 (10.9) Dry weight* kg(lb) 4.5 (9.9) 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) Bore mm(in) 38.0 (1.50) Stroke mm(in) 32.0 (1.26) Compression ratio 7.3 Carburetor Type Diaphragm horizontal-draught, with purge bulb** Model Walbro WT-829 Venturi size-throttle bore mm(in) ( ) Ignition Type CDI (Capacitor discharge ignition) system Spark plug with electronic timing advancer and speed governor BPM8Y Starter Type Automatic rewind Rope diameter x length mm(in) 3.0 x 900 (0.14 x 35.4) Fuel Type Premixed two-stroke fuel Mixture ratio 50 : 1 (2 %) Gasoline Two-stroke air cooled engine oil Minimum 89 octane gasoline ISO-L-EGD (ISO/CD13738), JASO FC 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) Sprocket Type Spur Number of teeth 6 Pitch in 3/8 * Without guide bar and saw chain. ** Purge bulb is on switch bracket. Cutting devices Guide bar Part No. 14A0CD A0CD A0CD3762 Called length in Gauge in Saw chain Type OREGON 91P / 91VG Number of drive links Pitch in Low profile 3/8 Gauge in 0.050

3 CS-370 SERVICE INFORMATION Technical data Engine Idling speed rpm Wide open throttle speed* rpm Clutch engagement speed rpm Compression pressure MPa (kgf/cm 2 ) (psi) 1.02 (10.4) (148) Ignition system Spark plug gap mm(in) ( ) Minimum secondary voltage at 1000 rpm kv 15 Secondary coil resistance kω Pole shoe air gaps mm (in) ( ) Ignition timing at 3000 rpm BTDC 10 Carburetor at 8000 rpm BTDC 32 at 10,000 rpm BTDC 34 Idle adjust screw initial setting turns in** 1 5/8 Test Pressure, minimum MPa (kgf/cm 2 ) (psi) 0.05 (0.5) (7.0) Metering lever height mm(in) 1.65 (0.06) lower than diaphragm seat Chain oil discharge volume at 7000 r/ min Adjustable : ( ) BTDC: Before top dead center. ml/min(u.s.fl.oz./min) * With 16 in. guide bar and saw chain. **Set idle adjust screw to contact throttle plate before initial setting. (Factory set 7 ml/min)

4 4 SERVICE INFORMATION CS Torque limits Descriptions Size kgf cm N m in lbf Starter system Ignition system Fuel system Starter pawl M Starter case M 5** Magneto rotor (Flywheel) M Ignition coil M Ignition switch M Spark plug M Carburetor M carburetor elbow M 5** Intake bellows M Clutch Clutch hub LM Engine Crankcase*** M 5* Engine mount M uffler M Cylinder cover M Others Auto-oiler M Regular bolt, nut, and screw Front handle M 5** Rear handle assembly M M Handle lid M Brake lever (Hand guard) M 5** M 4** Sprocket guard plate M 4** Chain catcher M Guide bar M M M M M LM: Left-hand thread *Apply thread locking sealant (See below) ** Tapping screw *** The torque differences among four bolts should not exceed 20 kgf cm (2N m, 17in lbf) on crankcase 1-4 Special repairing materials Material Location Remarks Adhesive Ball bearing outer / crankcase Pulse pipe joint Loctite #675 or equivalent Cushions Loctite #424, ThreeBond #1741 or equivalent Liquid gasket Crankcase seams Loctite #515 or equivalent Grease Auto-oiler worm Clutch needle bearing Handle cushions Rewind spring Starter center shaft Chain brake (metal contact part) Lithium based grease Molybdenum grease (approx. 1 gram)

5 CS Service Limits SERVICE INFORMATION 5 A B C D 5K275 5K277 5K278 5K279 E F G H 5K280 5K016 5K042 5K276 K L M P N 5K173 5K174 5K190 5K Description mm (in) A Cylinder bore When plating is worn and aluminum can be seen B Piston outer diameter Min (1.493) C Piston pin bore Max (0.3573) D Piston ring groove Max (0.063) E Piston ring side clearance Max (0.004) F Piston pin outer diameter Min (0.3535) G Piston ring width Min (0.057) H Piston ring end gap Max (0.02) K Con-rod small end bore Max (0.4734) L Crankshaft runout Max (0.002) M Sprocket bore Max (0.5146) N Clutch drum bore Max (2.81) P Sprocket wear limit Max (0.02)

6 6 SERVICE INFORMATION CS-370