SERVICE DATA
Contents
1. SERVICE INFORMATION CS 680 1 3 Torque limits Descriptions Size kgf cm Nem inelbf Starter Starter pawl M5 70 110 7 11 60 95 VSS Starter centre shaft screw M 5 70 110 7 11 60 95 Starter case M5 20 35 2 3 5 17 30 Ignition Magneto rotor Flywheel M8 230 270 23 27 200 235 system Ignition coil M4 35 50 35 5 30 45 Spark plug M14 130 170 13 17 113 150 Fuel Carburettor M5 20 40 2 4 17 35 yom Carburettor case M5 50 70 5 7 45 60 Intake bellows M5 70 110 7 11 60 95 Clutch Clutch hub LM 10 450 550 45 55 390 480 Engine Crankcase M5 70 110 7 11 60 95 Cylinder M5 70 110 7 11 60 95 Cylinder cover M5 30 50 3 5 25 35 Muffler M 5 70 110 7 11 60 95 Muffler bracket M5 35 50 3 5 5 30 45 Muffler lid M4 35 50 3 5 5 30 45 Others Auto oiler M4 35 50 3 5 5 30 45 Cushion Front handle M5 70 110 7 11 60 95 Crankcase M5 35 50 3 5 5 30 45 Cushion bracket M5 70 110 7 11 60 95 Compression Cushion bracket M5 50 70 5 7 45 60 Spring Crankcase M5 35 50 3 5 5 30 45 Eye plate Compression M4 35 50 3 5 5 30 45 spring M5 35 50 3 5 5 30 45 Front handle M 5 70 110 7 11 60 95 Brake lever Hand guard M5 25 45 2 5 4 5 22 40 Brake cover nut M3 6 10 0 6 1 5 9 Ignition switch M10 10 30 1 3 9 25 Guide bar M8 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 5 222. K Con rod small end bore L Crankshaft runout M Sprocket bore 16 025 0 01 0 6309 0 001 N Clutch drum bore P Sprocket wear limit CS 680 SERVICE INFORMATION l 1 6 Special tools 5 b 4mm 7 b 5mm ical Key Part Number Description Used for 1 897801 33330 Tachometer PET 1000 Measuring engine speed to adjust carburettor 2 895612 79920 L hex wrench 3 mm Removing and installing hex socket bolt M4 895610 79920 L hex wrench 4mm Removing and installing hex socket bolt M5 897537 30130 Piston stopper Locking crankshaft rotation 897724 01361 Spring pin tool 4mm Removing and installing spring pin 4 mm dia 897724 02831 Spring pin tool 5 mm Removing and installing spring pin 5 mm dia 897719 02830 Piston holder Making piston steady to remove and install piston rings 897702 30131 Piston pin tool Removing and installing piston pin 897501 03938 Puller Removing magneto rotor 897500 00335 Puller Removing auto oiler oil cover 897502 19830 Crankcase tool Separating crankcase 897701 14732 Bearing tool Removing and installing ball bearings on crankcase 897708 19835 Worm puller Removing auto oiler worm 14 Y089 000040 Worm inserter Installing auto oiler worm 15 897727 19830 Oil seal tool Installing clutch side oil seal 16 897726 21430 Oil seal tool Installing starter side oil seal 897826 16131 Pressure rubber plug Plu
3. saw chain CS 680 SERVICE INFORMATION 1 2 Technical data Engine Idling speed r min 2 600 300 Operating speed r min 9 500 10 000 Wide open throttle speed r min 12 900 13 900 Clutch engagement speed r min 3 600 4 300 Compression pressure MPa kgf cm psi 0 87 8 9 126 Ignition system Spark plug gap mm in 0 6 0 7 0 024 0 028 Minimum secondary voltage at 1 200 r min kV 21 Secondary coil resistance kO 1 7 2 2 Pole shoe air gaps mm in 0 30 0 40 0 012 0 016 Ignition timing at 1 500 r min BTDC 8 at 3 000 r min BTDC 15 at 8 000 r min BTDC 24 at 10 000 r min BTDC 25 Carburettor Idle adjust screw initial setting turn in 1 2 L mixture needle initial setting turns back 21 4 H mixture needle initial setting turns back 1 1 8 Test Pressure minimum MPa kgf cm psi 0 05 0 5 7 0 Metering lever height mm in Flush with diaphragm seat Chain oil discharge volume at 7 000 r min mL min U S fl oz min Adjustable 3 13 0 09 0 39 Factory set 7 5 mL min BTDC Before top dead centre 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 initial setting Turn L H mixture needles anticlockwise from point that needle is lightly seated 4
4. 01 67G 00 CS 680 MEGHO SERVICE DATA CHAIN SAW CS 680 Serial number 36000001 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 23 Model CS 6702 contains lots of informa tion for servicing this model CONTENTS page 1 SERVICE INFORMATION 08 2 1 1 Specification wicecccscasscccciascanssrecsssessnnsseecsiaces 2 1 2 Technical data ccccccecccscesseeceeeeeeeeeeeeees 3 1 3 Torque WINS strsnsewasinnpncisiedcanantionesatemniesnaenrsiean 4 1 4 Special repairing materials 008 5 ES Service NS nermin 6 1 6 Special OO IS aisesscsnssacestaccantnaeniasennaraesestiaaes 7 2 CARBURETTOR ADJUSTMENT PROCEDURE 8 2 1 General adjusting rules cccceeeeeeee ees 8 2 2 Presetting Idle adjust screw L mixture needle and H mixture needle oo ccc ceececeececeeseeeeeeeeeees 8 2 3 Adjusting Carburettor cccceceseeeeeeeeees 10 Reference No 01 67G 00 ISSUED 200901 E KIORITZ CORPORATION 2 1 SERVICE INFORMATION 1 1 Specifications SERVICE INFORMATION CS 680 Dimensions Length mm in 435 17 13 Width mm
5. 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 The torque difference between four bolts should not exceed 20 kgf gt cm 2N m 17inslbf per bolt CS 680 SERVICE INFORMATION 1 4 Special repairing materials Material Location Remarks Adhesive Guide bar stud Loctite 609 ThreeBond 1373 or equivalent tarter centre shaft scr planer cenlie s id Loctite 222 ThreeBond1342 or equivalent Brake cover nut Grease Auto oiler worm Clutch needle bearing Rubber cushion inside Choke knob Rewind spring Oil seal inner lips Starter centre shaft Lithium based grease or ECHO XTended Protection Lubricant Chain brake metal contact part Molybdenum grease approx 1 gram Thread locking sealant Front handle Compression spring Crankcase Eye plate Muffler Loctite 242 ThreeBond 1324 or equivalent 6 1 5 Service Limits SERVICE INFORMATION CS 680 Description mm in A Cylinder bore B Piston outer diameter C Piston pin bore 49 83 12 035 1 962 0 4738 When plating is worn and aluminium can be seen D Piston ring groove 1 3 0 051 E Piston ring side clearance Piston pin outer diameter G Piston ring width 0 1 11 98 1 15 0 004 0 4717 0 045 H Piston ring end gap 0 5 0 02
6. COMPLETELY REMOVE LIM ITER CAP FROM Carburettor If the first limiter cap is removed completely the second limiter cap can be misaligned while insert ing the cap removal tool 3 Remove the limiter cap removal tool from the limiter cap by turning the tool clockwise leaving the limiter cap in place 4 Screw 2 5 mm limiter cap removal tool P N 91019 anticlockwise into centre hole of remaining limiter cap until the limiter cap is removed from the mixture needle completely Remove the limiter cap from limiter cap removal tool by turning clockwise then screw limiter cap removal tool into centre hole of previous limiter cap to remove completely 5 Turn L and H mixture needle clockwise until lightly seated then turn both mixture needles anti clockwise for initial setting as follows L mixture needle 2 1 4 H mixture needle 1 1 8 NOTE If needles are forced during seating dam age to carburettor may occur 6 Remove air cleaner lid and air filter to expose the Idle adjust screw and throttle plate Turn Idle adjust screw anticlockwise and set the screw until the tip just contacts the throttle plate Then turn Idle adjust screw 1 2 turns clockwise Reinstall air filter and cleaner lid NOTE The initial carburettor settings for Idle ad just screw Idle and Hi speed mixture needles are intended to start and run the engine before final carburettor adjustments are made through this procedure The actual number of turns need
7. ed for engine operation may vary 1 0 SERVICE INFORMATION CS 680 2 3 Adjusting carburettor 1 Start and warm engine for 1 minute alternat Idle adjust screw ing engine speed between WOT and idle every 5 seconds Turn H mixture needle anticlockwise until engine speed drops to approx 11 500 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 using 2 5mm blade screwdriver to reach maximum engine r min just before lean r min drop off 3 Set idle speed to 3 600 r min by turning Idle adjust screw Engine speed should be stable H mixture needle L mixture needle at 3 600 50 r min after idle adjust screw adjustment 4 Turn L mixture needle anticlockwise reducing engine idle speed 1 000 r min to set idle speed at 2 600 r min The idle speed range is 2 500 2 700 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 Before adjustment WOT engine speed should be 11 500 r min or less If r min is higher turn H mixture needle anticlockwise until 11 500 r min is achieved To make the final WOT engine speed adjustment turn the H mixture needle clockwise in 1 8 turn increments with the engine at idle After each adjustment ac celerate to WOT and check r min The final r min should fall within 13 000 13 800 r min NOTE Wh
8. en the H mixture needle is turned completely clockwise the engine will continue to run If the engine speed at WOT is above 14 300 r min adjust H mixture needle anticlockwise and set maximum engine speed at less than 13 900 r min 6 After adjusting carburettor put new limiter cap on the other side c of limiter cap tool C as shown Align the limiter cap s tabs A with locating slots B in extended housing of carburettor and press the limiter caps to the bottoms on L and H mixture needles respectively IMPORTANT The limiter caps must be properly installed on L and H mixture needles to comply with Emission Directive 7 Start engine and verify engine idle speed ranges from 2 300 to 2 900 r min and WOT engine speed ranges from 12 900 to 13 900 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
9. gging intake port to test crankcase cylinder leakages 897827 16131 Pressure plate Plugging intake port to test crankcase cylinder leakages 19 897800 79931 Spark tester Checking ignition system 20 897803 30133 Pressure tester Testing carburettor leakages 21 91024 Pressure tester Testing crankcase leakages 22 91019 Limiter cap tool Removing and installing limiter cap 23 91004 Module air gap gauge Adjusting pole shoe air gaps 24 91037 Compression gauge Measuring cylinder compression 8 SERVICE INFORMATION CS 680 2 CARBURETTOR ADJUSTMENT PROCEDURE 2 1 General adjusting rules A Before adjustment check the following items 1 The correct spark plug must be clean and properly gapped 2 The air filter element must be clean and properly installed 3 The muffler exhaust port must be clear of carbon 4 The fuel lines tank vent and fuel filter are in good condition and clear of debris 5 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 6 The recommended bar and chain must be installed and properly tensioned NOTE In order to achieve proper carburettor adjustment a 50 cm bar and chain should be installed on the unit Otherwise serious engine damage will occur due to overspeeding B Adjustment with limiter caps on carburettor Set L and H mixture needles fully anticlockwise Start and run engine for two minutes alterna
10. in 236 9 29 Height mm in 302 11 89 Dry weight kg Ib 6 6 14 5 Engine Type KIORITZ air cooled two stroke single cylinder Ventilated piston Semi automatic decompression Rotation Clockwise as viewed from the output end Displacement cm in 66 8 4 076 Bore mm in 50 0 1 969 Stroke mm in 34 0 1 339 Compression ratio 7 6 Carburettor Type Diaphragm horizontal draught Model Walbro HDA 272 Venturi size Throttle bore mm in 15 08 19 03 0 594 0 749 Ignition Type CDI Capacitor discharge ignition system with electronic timing advancer Spark plug BPMR7A Starter Type Automatic rewind Rope diameter x length mm in 4 5x 950 0 18 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 oz 0 64 21 6 Clutch Type Centrifugal 3 shoe slide with 3 tension spring Guide bar Saw chain lubrication type Automatic with volume adjuster and manual override Tank capacity oil L U S fl 0z 0 37 12 5 Sprocket Type Floating rim Number of teeth 74 Pitch in 3 8 Guide bar Type 45858 50858 60558 45RS58 3 8E 50RS58 3 8E 60RS58 3 8E Called length cm 45 50 60 Gauge in 0 058 Saw chain Type CARLTON A2LM OREGON 73LGX Number of drive links 64 72 84 Pitch in 3 8 Gauge in 0 058 Without guide bar and
11. ting engine speed between WOT for 5 seconds and idle for 5 seconds Adjust idle speed screw to 2 600 150 r min Adjust H mixture needle with limiter cap to 13 400 300 r min If engine does not run correctly af ter this adjustment proceed to the next step 2 2 IMPORTANT After adjusting carburettor according to the steps 2 2 and 2 3 the limiter cap s must be installed on L and H mixture needle s to comply with Emission Directive 2 2 Presetting Idle adjust screw L mixture needle and H mixture needle Tools Required Small screwdriver with 2 5 mm blade electronic tachometer P N 897801 33330 limiter cap removal tool with 2 5 mm left hand thread P N 91019 Parts Required 2 limiter caps P N P003 000010 1 Turn the L and H mixture needles anticlockwise to rich side stop to align limiter cap tab A with lo cating slot B using 2 5 mm blade screwdriver NOTE If cap tabs A misalign with locating slots B the cap cannot be removed and the centre hole threads will strip If centre hole threads strip use 3 mm diameter thread wood screw to remove the limiter cap continued CS 680 SERVICE INFORMATION 2 2 Presetting Idle adjust screw L mixture needle and H mixture needle continued l 2 Screw 2 5 mm limiter cap removal tool P N 91019 anticlockwise into centre hole of either lim iter cap until tab of the limiter cap just comes out of the locating slot NOTE DO NOT
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