01-36C-01 |
CS-3700ES, CS-4200ES |
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1
0
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.
ECHO SERVICE MANUAL Ord. 40121(Model : CS-4200, CS-4400) contains lots of information for servicing this model.
Introduction of primer and carburettor change
on CS-3700ES are informed by Technical Information No. 2006-324.
CONTENTS
1 SERVICE INFORMATION |
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1-1 Specification ............................................... |
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1-2 Technical data ............................................ |
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1-3 Torque limits ............................................... |
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1-4 Special repairing materials......................... |
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1-5 Service limits .............................................. |
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1-6 |
Special tools ............................................... |
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2 EMISSION ADJUSTMENT GUIDE ............... |
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2-1 |
General adjusting rules .............................. |
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2-2 |
Presetting idle adjust screw, L mixture needle |
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and H mixture needle ....................................... |
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2-3 Adjusting carburettor.................................. |
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Reference No. 01-36C-01
R E V I S E D : 2 0 0 6 0 7
ISSUED: 200409
INDEX
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CS-3700ES |
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SERVICE INFORMATION |
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CS-4200ES |
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1 SERVICE INFORMATION |
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1-1 Specifications |
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Model |
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CS-3700ES |
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CS-4200ES |
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Dimensions |
Length* |
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mm(in) |
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383 |
(15.1) |
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Width |
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mm(in) |
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238 |
(9.4) |
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Height |
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mm(in) |
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270 |
(10.6) |
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Dry weight* |
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kg(lb) |
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4.4 |
(9.7) |
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Engine |
Type |
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KIORITZ, air-cooled, two-stroke, single cylinder |
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Ventilated piston |
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Rotation |
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Clockwise as viewed from the output end |
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Displacement |
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cm3(in3) |
35.8 (2.19) |
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39.6 (2.42) |
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Bore |
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mm(in) |
39 |
(1.54) |
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41 |
(1.61) |
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Stroke |
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mm(in) |
30 |
(1.18) |
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30 |
(1.18) |
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Compression ratio |
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7.4 |
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7.45 |
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Carburettor |
Type |
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Diaphragm horizontal-draught with auto-return choke |
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Model |
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WT-416C |
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Walbro WT-594 |
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Walbro WT-812 with primer** |
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Venturi size-Throttle bore |
mm(in) |
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13.5 - 15.85 (0.532 - 0.624) |
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Ignition |
Type |
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CDI (Capacitor discharge ignition) system |
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Spark plug |
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BPMR7A |
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RCJ6Y |
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Starter |
Type |
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ES (Effortless-start) |
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Rope diameter x length |
mm(in) |
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3.0 x 830 (0.12 x 32.7) |
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Fuel |
Type |
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Premixed two-stroke fuel |
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Mixture ratio |
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50 : 1 (2 %) |
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Petrol |
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Minimum 89 octane petrol (RON) |
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Two-stroke air cooled engine oil |
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ISO-L-EGD (ISO/CD13738), JASO FC |
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Tank capacity |
L (U.S.fl.oz.) |
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0.41 |
(13.9) |
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Clutch |
Type |
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Centrifugal, 3-shoe slide with 3-tension spring |
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Guide bar / Saw chain lubrication type |
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Automatic with volume adjuster |
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Oil |
Tank capacity |
L (U.S.fl.oz.) |
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0.24 (8.1) |
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Sprocket |
Type |
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Spur |
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Number of teeth |
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7 |
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Pitch |
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in |
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0.325 |
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*Without guide bar and saw chain.
**Primer is installed on switch bracket since serial number 36008701 on CS-3700ES.
Cutting devices |
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Guide bar |
Type |
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33RD58-325 |
38RD58-325 |
43RD58-325 |
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Called length |
cm |
33 |
38 |
43 |
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Gauge |
in |
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0.058 |
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Saw chain |
Number of drive links |
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56 |
64 |
72 |
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Pitch |
in |
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0.325 |
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Gauge |
in |
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0.058 |
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CS-3700ES |
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3 |
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CS-4200ES |
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SERVICE INFORMATION |
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1-2 Technical data |
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Model |
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CS-3700ES |
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CS-4200ES |
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Engine |
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Idling speed |
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r/min |
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2300 - 3000 |
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Operating speed* |
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r/min |
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8500 - 9000 |
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High speed (No load full throttle)* |
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r/min |
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11500 - 12500 |
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Clutch engagement speed* |
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r/min |
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3500 - 4300 |
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Compression pressure |
MPa (kgf/cm2) (psi) |
1.0 (10) (145) |
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1.15 (11.5) (165) |
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Ignition system |
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Spark plug gap |
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mm(in) |
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0.6 - 0.7 (0.024 - 0.028) |
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Minimum secondary voltage at 1000 r/min |
kV |
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15 |
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Secondary coil resistance |
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kΩ |
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1.7 - 2.2 |
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Pole shoe air gaps |
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mm(in) |
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0.35 - 0.45 (0.014 - 0.018) |
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Ignition timing |
at 1500 |
r/min |
° BTDC |
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25 |
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Carburettor |
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WT-416C |
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WT-812 |
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WT-594 |
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Idle adjust screw initial setting |
turns in** |
1 1/8 |
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1 3/4 |
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1 3/8 |
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L mixture needle initial setting |
turns back |
1 1/4 |
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1 1/4 |
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H mixture needle initial setting |
turns back |
3 |
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3 1/2 |
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2 5/8 |
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Test Pressure, minimum |
MPa (kgf/cm2) (psi) |
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0.05(0.5)(7.0) |
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Metering lever height |
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mm(in) |
1.65 (0.06) lower than diaphragm seat |
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Chain oil discharge volume at 7000 r/min |
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Adjustable : 1.5 - 13 (0.05 - 0.40) |
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mL/min(U.S.fl.oz./min) |
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(Factory set 7 mL/min) |
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BTDC: Before top dead centre.
*With 38cm guide bar and saw chain.
**Set idle adjust screw to contact throttle plate before initial setting.
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