00-30C-00 CS-301 CS-341 CS-346 1

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SERVICE DATA

CHAIN SAW

CS-301 CS-341

CS-346

INTRODUCTION CONTENTS page We are constantly working on technical 1 SERVICE INFORMATION ...... 2 improvement of our products. For this reason, 1-1 Specification ...... 2 technical data, equipment and design are 1-2 Technical data ...... 3 subject to change without notice. All 1-3 Torque limits ...... 4 specifications and directions in this SERVICE 1-4 Special repairing materials ...... 4 1-5 Service limits ...... 5 DATA are based on the latest products information available at the time of publication. For further information to service these models, please refer to ECHO SERVICE MANUAL Ord. No. 401-20.

Reference No. 00-30C-00 ISSUED: 200102

CS-301 CS-341

2 SERVICE INFORMATION CS-346

1 SERVICE INFORMATION

1-1 Specifications Model CS-301 CS-341 CS-346 Dimensions Length* mm(in) 260 (10.2) 260 (10.2) 380 (15.0)

Width mm(in) 235 (9.3) 235 (9.3) 235 (9.3) Height mm(in) 220 (8.7) 220 (8.7) 245 (9.6) Dry weight* kg(lb) 3.2 (7.1) 3.3 (7.3) 3.4 (7.5) Engine Type KIORITZ, air-cooled, two-, single Two-piece casting, Reed valve Rotation Clockwise as viewed from the output end Displacement cm3(in3) 30.1 (1.836) 33.4 (2.037) mm(in) 37.0 (1.457) 39.0 (1.535) Stroke mm(in) 28.0 (1.102) 28.0 (1.102) 7.0 : 1 Type Diaphragm, horizontal-draught Model Walbro WT-589 Venturi size- bore mm(in) 9.53 - 14.3 (3/8 - 9/16) Ignition Type CDI ( discharge ignition) system in a single integrated piece, with electronic timing advancer BPM8Y Exhaust Spark arrestor muffler with catalyst Type type Automatic rewind Rope diameter x length mm(in) 3.0 x 850 (0.12 x 33.5)

Fuel Type Premixed two-stroke fuel (Refer to Operator’s manual.) Tank capacity cm3(U.S.fl.oz.) 250 (8.5) Clutch Type Centrifugal, 3-shoe slide Guide bar / Saw chain lubrication type Automatic with volume adjuster Tank capacity, oil cm3(U.S.fl.oz.) 150 (5.0) Sprocket Type Spur Number of teeth 6 Pitch in 3/8 Cutting devices

Guide bar Type Double guard 120374501 140375201 160375201 Intenz 122374501 142375201 162375701

Gauge in 0.050 alle d Length in 12 14 16

Saw chain Type 91VG-45G 91VG-52G 91VG-57G aug e in 3/8

Pitch in 0.050

*Without guide bar and saw chain.

CS-301 CS-341

CS-346 SERVICE INFORMATION 3

1-2 Technical data Model CS-301 CS-341 CS-346 Engine Idling speed r/min 2700 - 3300 Operating speed r/min 7000 - 10000 High speed (No load full throttle)* r/min 10500 - 12500 Clutch engagement speed r/min 4200 - 4700 Compression pressure Mpa (kgf/cm2) (psi) 0.95(9.5)(135) 0.85(8.5)(120) Spark plug gap mm(in) 0.6 - 0.7 (0.024 - 0.028)

Minimum secondary at 1500 r/ min kV 17 Secondary coil resistance ký 1.3 - 1.7 Pole shoe air gaps mm(in) 0.30 - 0.40 (0.012 - 0.016) at 1000 r/min °BTDC 16 at 3000 r/min °BTDC 17.5 at 7500 r/min °BTDC 30 Carburetor Idle speed screw initial setting turn in† 1 1/2

Test Pressure, minimum MPa (kgf/cm2 ) (psi) 0.05 (0.5) (7.0) Metering lever height mm (in) 1.65 (0.065) lower than diaphragm seat Chain oil discharge volume at 7000 r/ min cm3/min(U.S.fl.oz./min) 1.5 -13 (0.05 - 0.45) adjustable

BTDC: Before top dead center. *With guide bar and saw chain. † Set idle speed screw to contact throttle plate before initial setting.

CS-301 CS-341

4 SERVICE INFORMATION CS-346

1-3 Torque limits Descriptions Size kgf•cm N•m in•lbf Starter Starter pawl M 5† 30 - 40 3.0 - 4.0 25 - 35 system Starter center shaft screw M 4* 20 - 40 2.0 - 4.0 17 - 35 Starter case M 4* 10 - 20 1.0 - 2.0 9 - 17 Ignition rotor () M 8 160 - 200 16 - 20 140 - 175 system (CDI module) M 5† 30 - 40 3.0 - 4.0 25 - 35 Ignition switch M 10 20 - 30 2.0 - 3.0 17 - 25 Spark plug M 14 150 - 170 15 - 17 130 - 150 Fuel Carburetor M 5 35 - 45 3.5 - 4.5 30 - 40 system Insulator M 5 40 - 50 4.0 - 5.0 35 - 45 Reed valve M 3 8 - 12 0.8 - 1.2 7 - 10 Clutch Clutch hub LM 8 200 - 230 20 - 23 175 - 200 Engine M 5 30 - 40 3.0 - 4.0 25 - 35 Engine mount M 5 80 - 90 8.0 - 9.0 70 - 80 Muffler M 5 60 - 70 6.0 - 7.0 50 - 60 Isolator Front M 4* 20 - 30 2.0 - 3.0 17 - 25 M 5 35 - 45 3.5 - 4.5 30 - 40 Rear M 4 25 - 35 2.5 - 3.5 20 - 30 Others Auto-oiler M 5 30 - 40 3.0 - 4.0 25 - 35 Throttle latch M 10 6 - 8 0.6 - 0.8 5 - 7 Front handle top M 5 30 - 40 3.0 - 4.0 25 - 35 Brake lever (Hand guard) M 5 30 - 40 3.0 - 4.0 25 - 35 Guide bar M 6 90 - 110 9.0 - 11.0 80 - 95 Regular bolt, nut, M 3 6 - 10 0.6 - 1.0 5 - 9 and screw M 4 15 - 25 1.5 - 2.5 13 - 22 M 5 25 - 45 2.5 - 4.5 22 - 40 M 6 45 - 75 4.5 - 7.5 40 - 65

LM: Left-hand thread. * Tapping screw. †Apply thread locking sealant.

1-4 Special repairing materials

Material Location Remarks Adhesive Crankcase bearing bore Loctite #675 or equivalent Oil pipe grommet Loctite Instant Adhesive #424 or equivalent Grease Auto-oiler worm

Clutch needle bearing TM Brake band seal Lithium based grease or ECHO LUBE Rewind spring Chain brake (metal contact part) Molybdenum grease (approx. 1 gram) Oil Oil seal inner lips Liquid Crankcase seams Loctite #518 or equivalent Threa locking Starter pawl screws Loctite #222 or equivalent sealant Ignition coil (CDI module)

CS-301 CS-341

CS-346 SERVICE INFORMATION 5

1-5 Service Limits

Model CS-301 CS-341 CS-346 Cylinder bore When plating is worn and aluminum can be seen outer diameter Min. 36.91 (1.453) 38.88 (1.531) Piston pin bore Max. 8.030 (0.3161) groove Max. 1.3 (0.051) 1.6 (0.063) Piston ring side clearance Max. 0.15 (0.006) 0.1 (0.004) Piston pin outer diameter Min. 7.98 (0.3142) Piston ring width Min. 1.15 (0.045) 1.45 (0.057) Piston ring end gap Max. 0.5 (0.02) Con-rod small end bore Max. 11.025 (0.4341) runout Max. 0.05 (0.002) Sprocket bore Max. 13.08 (0.5150) Clutch drum bore Max. 61.0 (2.40) Sprocket wear limit Max. 0.5 (0.02)