SERVICE DATA
Contents
1. Description mm in A Cylinder bore When plating is worn and aluminum can be seen B Piston outer diameter Min 44 89 1 767 C Piston pin bore Max 11 035 0 4344 D Piston ring groove Max 1 35 0 053 E Piston ring side clearance Max 0 1 0 004 F Piston pin outer diameter Min 10 98 0 4323 G Piston ring width Min 1 15 0 045 H Piston ring end gap Max 0 5 0 02 K Con rod small end bore Max 15 025 0 5915 L Crankshaft runout Max 0 01 0 001 M Sprocket bore Max 13 90 0 5472 N Clutch drum bore Max 71 5 2 81 P Sprocket wear limit Max 0 5 0 02 CS 550 SERVICE INFORMATION 1 6 Special tools 4 b 4mm 5 b 5mm Key Part Number Description Used for 1 G310 000050 Tachometer PET 304 Measuring engine speed to adjust carburettor 2 X605 000050 Torx L wrench T27 Removing and installing bolt 3 897537 30130 Piston stopper Locking crankshaft rotation 4 897724 01361 Spring pin tool 4mm Removing and installing spring pin 4 mm dia 5 897724 02831 Spring pin tool 5 mm Removing and installing spring pin 5 mm dia 6 897719 02830 Piston holder Making piston steady to remove and install piston rings 7 897702 30131 Piston pin tool Removing and installing piston pin 8 897501 03938 Puller Removing2. Brake cover M5 40 60 4 6 35 50 Sprocket guard plate M4 15 25 1 5 2 5 13 22 Spring holder M5 30 45 3 4 5 25 40 Spike M5 60 90 6 9 50 80 Ignition switch M10 15 30 15 3 13 25 Guide bar M5 200 230 20 23 175 200 Regular bolt nut and screw M3 6 10 0 6 1 5 9 M4 15 25 1 5 2 5 13 22 M5 25 45 2 5 4 5 22 40 M6 45 75 4 5 7 5 40 65 M8 110 150 11 15 95 130 LM Left hand thread Thread locking sealant See next page t The torque difference between four bolts should not exceed 20 kgf cm 2N m 17inslbf per bolt CS 550 SERVICE INFORMATION 1 4 Special repairing materials Material Location Remarks Adhesive Guide bar stud v si u Loctite 609 ThreeBond 1373 or equivalent Starter case Brake lever side Starter center shaft screw Loctite 222 ThreeBond 1342 or equivalent Grease Auto oiler worm Clutch needle bearing Rubber cushion inside Choke knob Rewind spring Oil seal inner lips Starter center shaft Brake cover Lithium based grease or ECHO XTended Protection Lubricant Chain brake metal contact part Molybdenum grease approx 1 gram Thread locking sealant Muffler Sprocket guard plate Starter pawl Loctite 242 ThreeBond 1324 or equivalent 6 SERVICE INFORMATION CS 550 1 5 Service Limits
3. 01 54B 00 CS 550 MECHO SERVICE DATA CHAIN SAW ECHO CS 550 STAGE I MODEL Serial number 37000001 and after INTRODUCTION We are constantly working on technical im provement of our products For this reason technical data equipment and design are subject to change without notice All speci fications and directions in this SERVICE DATA are based on the latest product infor mation available at the time of publication ECHO SERVICE MANUAL Ord 401 31 Model CS 600 contains additional infor mation for servicing this model CONTENTS page 1 SERVICE INFORMATION 0 0 2 1 1 Specification siriano 2 1 2 Technical data sis iisiccnteniii ice heal 3 1 8 TOGUE lM S iiiaae 4 1 4 Special repairing materials 5 1 5 Service IMS eeii 6 1 6 Special t0olS siiin 7 2 CARBURETTOR ADJUSTMENT PROCEDURE 8 2 1 General adjusting rules 8 2 2 Presetting Idle adjust screw L mixture needle and H mixture needle a nns 8 2 3 Adjusting carburettor 9 Reference No 01 54B 00 ISSUED 201102 _ YANMABIKO 2 SERVICE INFORMATION CS 550 1 SERVICE INFORMATION 1 1 Specifications Dimensions Length mm in 448 17 64 Width mm in 253 9 96 Height mm in 284 11 18 Dry weight kg Ib 6 0 13 2 Engine Type YAMABIKO stratified scavenging air cooled two stroke single cylinder Ventilated piston Semi automatic decompression Rotation Clockwise as vie
4. e 1 3 8 turns NOTE The initial carburettor settings for idle adjust screw L and H mixture needles are intended to start and run the engine before making final carburettor adjustments to meet Emission Directive Actual turns required for engine operation may vary CS 550 SERVICE INFORMATION 9 2 3 Adjusting carburettor 1 Start and warm engine for 1 minute alternating engine speed between WOT and idle every 5 sec onds Turn H mixture needle C anticlockwise until engine speed drops to approx 12 000 r min at WOT NOTE Do not run engine at high speed without load longer than 10 seconds or engine damage may occur 2 Adjust L mixture needle B using D shaped tool A to reach maximum engine speed just before lean r min drop off 3 Set idle speed to 3 600 r min by turning Idle adjust screw D Engine speed should be stable at 3 600 50 r min after Idle adjust screw adjustment 4 Turn L mixture needle B anticlockwise reduc ing engine idle speed 800 r min to set idle speed at 2 800 r min The idle speed range is 2 700 2 900 r min NOTE Engine speed must be allowed to stabilize a minimum of 20 seconds after each adjustment of L mixture needle to assure accurate tachometer readings 5 After adjustment L mixture needle WOT engine speed should be 12 000 r min or less before adjustment H mixture needle If engine speed is higher turn H mixture needle C anticlockwise until 12 000 r min is achiev
5. ed Stabilize engine for 45 seconds alternating engine speed between WOT for 10 seconds and idle for 5 seconds To make the final WOT engine speed adjustment turn the H mixture needle C clockwise in 1 8 turn increments with the engine at idle After each ad justment accelerate to WOT and check engine speed The final engine speed should fall within 12 800 13 000 r min at WOT 6 Start engine and verify engine idle speed ranges from 2 600 to 3 000 r min and WOT engine speed ranges from 12 500 to 13 500 r min Make sure the chain does not rotate when engine is idling When final adjustment is completed the engine should idle accelerate smoothly and attain WOT per above specifications NOTE Engine WOT and idle engine speed in field operation may vary from final adjustment specifica tions due to changing ambient conditions fuel and engine loads Safe engine speed variances should be within the WOT Idle engine speed ranges listed in Section 1 2 otherwise the carburettor should be read justed
6. he fuel lines tank vent and fuel filter are in good condition and clear of debris The fuel is fresh gt 89 octane RON and properly mixed at 50 1 with ISO L EGD or JASO FC FD 2 stroke oil The recommended bar and chain must be installed and properly tensioned NOTE In order to achieve proper carburettor adjustment a 38 40 45 or 50 cm bar and chain should be installed on the unit Otherwise serious engine damage will occur due to overspeeding B Preliminary adjustment Adjustment by Idle adjust screw of carburettor Start and run engine for two minutes alternating engine speed between WOT for 10 seconds and idle for 10 seconds Adjust idle speed screw to 2 800 150 r min Make sure WOT engine speed in range 12 500 13 500 r min If engine does not run correctly after this adjustment proceed to the next step 2 2 2 2 Presetting Idle adjust screw L mixture needle and H mixture needle Tools Required Small screwdriver with 2 5 mm blade P N G310 000050 electronic tachometer P N Y089 000090 D shaped tool A 1 Turn L and H mixture needle clockwise until lightly seated and then turn out both mixture nee dles following turns L mixture needle B 1 3 8 H mixture needle C 3 3 8 NOTE If needles are overtighted during seating damage to carburettor may occur 2 Turn Idle adjust screw D anticlockwise until idle adjust screw tip just touches throttle plate Then turn it clockwis
7. ide bar Part No 40RV58 3 8E 45RV58 3 8E 50RV58 3 8E Called length cm 40 45 50 Gauge in 0 058 Saw chain Number of drive links 60 64 72 Pitch in 3 8 Gauge in 0 058 1 2 Technical data Engine Idling speed r min 2 800 200 Wide open throttle speed r min 12 500 13 500 Clutch engagement speed r min 4 000 Minimum r min 3 300 Compression pressure MPa kgf cm psi 1 04 10 6 151 Ignition system Spark plug gap mm in 0 6 0 7 0 024 0 028 Minimum secondary voltage at 1 500 r min kV 17 Primary coil resistance Q 300 340 Secondary coil resistance kQ 2 5 2 9 Pole shoe air gaps mm in 0 30 0 40 0 012 0 016 Ignition timing at 3 000 r min BTDC 5 at 8 000 r min BTDC 24 at 12 000 r min BTDC 28 PET 9000 Parameter 1 325 Parameter 2 03 Carburettor Idle adjust screw initial setting turns in 1 3 8 L mixture needle initial setting turns out 1 3 8 H mixture needle initial setting turns out 3 3 8 Test Pressure minimum MPa kgf cm psi 0 05 0 5 7 0 Metering lever height mm in 1 50 0 06 lower than diaphragm seat Chain oil discharge volume at 7 000 r min mL min U S fl oz min Adjustable 1 5 13 0 05 0 39 Factory set 7 0 mL min BTDC Before top dead center With 50 cm guide bar and properly adjusted saw chain Set idle adjust screw to the point that its tip just contacts throttle plate before ini
8. magneto rotor 9 91004 Module air gap gauge Adjusting pole shoe air gaps 10 897502 19830 Crankcase tool Separating crankcase 11 897701 14732 Bearing tool Removing and installing ball bearings on crankcase 12 91037 Compression gauge Measuring cylinder compression 13 Y089 000090 D shaped tool Adjusting mixture needle 14 91024 Pressure tester Testing crankcase leakages 15 897726 16431 Oil seal tool Installing starter side oil seal 16 897800 79931 Spark tester PET 4000 Checking ignition system 17 897803 30133 Pressure tester Testing carburettor leakages 18 900300 Ignition Analyzer PET 9000 Measuring Ignition timing Primary Secondary voltage engine speed 19 897714 12330 Oil seal tool Installing crankcase side oil seal 20 91041 Pressure rubber plug Plugging exhaust port to test crankcase cylinder leakages 21 895624 32731 Torx T wrench T27 Removing and installing bolt 22 897826 16131 Pressure rubber plug Plugging intake port to test crankcase cylinder leakages 23 897827 16131 Pressure plate Plugging intake port to test crankcase cylinder leakages 8 SERVICE INFORMATION CS 550 2 CARBURETTOR ADJUSTMENT PROCEDURE 2 1 General adjusting rules 5 1 2 3 4 6 A Before adjustment check the following items The correct spark plug must be clean and properly gapped The air filter element must be clean and properly installed The muffler exhaust port must be clear of carbon T
9. tial setting Turn L H mixture needles anticlockwise from point that needle is lightly seated t If clutch engagement speed is lower than minimum r min replace clutch assembly with new one 4 SERVICE INFORMATION CS 550 1 3 Torque limits Descriptions Size kgf cm Nem inelbf Starter Starter pawl M5 60 100 6 10 50 90 system Starter case M5 30 50 3 5 25 45 Brake lever side M5 70 90 7 9 60 80 Ignition Magneto rotor Flywheel M8 160 200 16 20 140 175 system Ignition coil M5 35 50 3 5 5 30 45 Spark plug M14 130 170 13 17 113 150 Fuel Carburettor M5 30 40 3 4 25 35 system Intake bellows M5 75 95 7 5 9 5 65 85 Clutch Clutch hub LM10 300 400 30 40 265 350 Cylinder cover Fan cover side M6 15 25 1 5 2 5 13 22 Recoil side M5 15 30 15 3 13 25 Engine Crankcase Ms 60 90 6 9 50 80 Cylinder mst 60 100 6 10 50 90 Cylinder cover M5 60 90 6 9 50 80 Muffler M5 70 110 7 11 60 95 Muffler plate M4 15 25 1 5 2 5 13 22 Exhaust gasket M5 70 110 7 11 60 95 Other Auto oiler M4 30 50 3 5 25 45 Compression spring Engine M5 30 45 3 4 5 25 40 Crankcase M5 60 80 6 8 50 70 Front handle M5 60 90 6 9 50 80 Front handle M6 40 55 4 55 35 48 M5 40 60 4 6 35 50 Rear handle M5 40 60 4 6 35 50 Brake lever M5 60 90 6 9 50 80
10. wed from the output end Displacement em in 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 Muffler type Spark arrester muffler 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 0z 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 0z 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 3 CS 550 SERVICE INFORMATION Oregon Saw chain 73LGX Cutting devices Gu
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