INDEX INTRODUCTION. Reference No L-01 REVISED:

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1 12-21L 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 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 Spacial tool EMISSION ADJUSTMENT GUIDE General adjusting rules Presetting idle adjust screw, L mixture needle and H mixture needle Adjusting carburettor... 9 INDEX Reference No L-01 REVISED: ISSUED:

2 2 SERVICE INFORMATION 1 SERVICE INFORMATION 1-1 Specifications Model Dimensions Length mm(in) 990 (39.0) Width mm(in) 250 (9.8) Height mm(in) 195 (7.7) Dry weight kg(lb) 5.2 (11.5) Engine Type KIORITZ, air-cooled, two-stroke, single cylinder Rotation Anticlockwise as viewed from the output end Displacement cm 3 (in 3 ) 21.2 (1.29) Bore mm(in) 32.2 (1.27) Stroke mm(in) 26.0 (1.02) Compression ratio 6.1 Carburettor Type Diaphragm, horizontal-draught, with primer (purge bulb) Model ZAMA C1U-K54A Ignition Type CDI (Capacitor discharge ignition) system Variable Slope Timing (VST) : Slope advance ignition system combined with electronic speed governor Spark plug BPMR-7A Starter Type Automatic rewind Rope diameter x length mm(in) 3.0 x 890 (0.12 x 35.0) Fuel Type Premixed two-stroke fuel Mixture ratio 50 : 1 (2 %) Petrol Minimum 89 octane petrol (RON) Two-stroke air cooled engine oil ISO-L-EGD (ISO/CD13738), JASO FC Tank capacity L (U.S.fl.oz.) 0.3 (10.1) Clutch Type Centrifugal, 2-shoe slide Handle Type Front Plastic grip with hand guard Rear Integrated control plastic grip Gear case Reduction ratio 4.5 Gear tooth Spur gear Lubrication Lithium based grease (Grease up every hours of operating) Cutter Type Double reciprocating double edge blade Called length mm(in) 580 (23) Pitch mm(in) 35 (1.38) Height mm(in) 21 (0.83) Thickness mm(in) 2.5 (0.098) Lubrication Drop a few oil every 4 hours of operation to 4 bolt slots

3 SERVICE INFORMATION Technical data Engine Idling speed r/min Wide open throttle speed r/min Clutch engagement speed r/min Compression pressure MPa (kgf/cm 2 ) (psi) 0.69 (7.0) (100) Ignition system Spark plug gap mm(in) ( ) Minimum secondary voltage at 1500 r/ min kv 15 Primary coil resistance Ω Secondary coil resistance kω Pole shoe air gaps mm(in) ( ) Ignition timing at 3000 r/min BTDC 20.0 Carburettor at 7000 r/min BTDC 42.0 at 8000 r/min BTDC 19.0 at 8500 r/min BTDC 15.0 Venturi size mm(in) 8.5 (0.34) Throttle bore mm(in) 12.7 (0.5) Idle adjust screw initial setting turn in* 2 3/4 H mixture needle initial setting turn back 1 1/2 L mixture needle initial setting turn back 1 1/2 Test Pressure, minimum MPa (kgf/cm 2 ) (psi) 0.05 (0.5) (7.0) Metering lever height mm(in) ( ) lower than diaphragm seat BTDC: Before top dead centre. * Set idle speed screw to contact throttle plate before initial setting.

4 4 SERVICE INFORMATION 1-3 Torque limits Descriptions Size kgf cm N M in lbf Starter Pawl assembly M system Starter case M 4* Ignition Ignition coil M system Spark plug M Fuel Carburettor M system Intake insulator M 5* Fuel tank M 5* Clutch Clutch hub M Clutch case M 4* Engine Crankcase M 5** Cylinder M 5** Muffler M Cylinder cover M 4* Gear Gear case M case Bottom cover M Cutter Cutter bolts (See NOTE below) M Handle Cutter support M 6* Rear handle set to handle fixture M 5* Front handle M Regular bolt, nut and screw M M M M M * Apply thread locking sealant (See next page). ** The torque differences among 2 bolts should not exceed 20 kgf cm (2Nm, 17in lbf) on one cylinder or crankcase. NOTE : To adjust cutter clearance, fasten all cutter bolts to this torque, then back 1/2 turns (180 ) Anticlockwise.

5 SERVICE INFORMATION Special repairing materials Material Location Remarks Grease Gear case Rewind spring Starter center post Lithium based grease Oil seal inner lips Thread locking Intake insulator sealant Clutch case Cylinder cover Fuel tank Loctite #222, ThreeBond 1342 or equivalent Cutter support Starter case Rear handle set to handle fixture

6 6 SERVICE INFORMATION 1-5 Service limits A B C D E F G H 5K016 5K042 K L 5K171 5K Servicelimits_HCR_1510 Description mm (in) A Cylinder bore When plating is worn and aluminium can be seen B Piston outer diameter Min (1.264) C Piston pin bore Max (0.3161) D Piston ring groove Max. 1.6 (0.063) E Piston ring side clearance Max. 0.1 (0.004) F Piston pin outer diameter Min (0.3138) G Piston ring width Min (0.057) H Piston ring end gap Max. 0.5 (0.02) K Crankshaft runout Max (0.002) L Clutch drum bore Max (2.03)

7 Special tools SERVICE INFORMATION : a=4mm : a=3mm a Key Part Number Description Used for: Tachometer (PET-1000) Measuring engine speed to adjust carburettor Compression gauge Measuring cylinder compression L-hex wrench (4 mm) Removing and installing hex. socket bolts (M5) L-hex wrench (3 mm) Removing and installing hex. socket bolts (M4) Bearing wedge Removing ball bearings on crankshaft Bearing tool Removing and installing crankcase bearings Piston pin tool Removing and installing piston pin (Use 8 mm dia. adapter) pin wrench Removing and installing pawl carrier Oil seal tool Installing crankcase oil seals Bearing tool Installing clutch drum ball bearing in gear case Clutch tool Removing and installing clutch assembly Spark tester Checking ignition system Pressure tester Checking carburettor and crankcase leakages Pressure connector Checking crankcase and cylinder leakages Bolt Removing magneto rotor (flywheel) Flange nut Removing magneto rotor (flywheel)

8 8 SERVICE INFORMATION 2 EMISSION ADJUSTMENT GUIDE 2-1 General adjusting rules Before starting the unit for 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 ( > 89 octane : RON) and properly mixed at 50 : 1 with ISO L-EGD 2 stroke oil. 2-2 Presetting idle adjust screw, L mixture needle and H mixture needle 1. Turn L mixture needle (A) clockwise until lean stop to cut and remove easily. 2. Using a sharp knife, give triangle cut between the stopper wings. Also cut the H limiter cap (B). NOTE : Be careful when cutting caps, otherwise injury may result. 3. Pull the caps off with pliers. NOTE : Do not rock back and forth when removing, otherwise the needle may be damaged. 4. Turn H and L mixture needles clockwise until lightly seated. NOTE : Do not over tighten needles, otherwise needles tip and seat damage may occur. B C A 5. Turn L mixture needle anticlockwise 1 1/2 turns. Turn H mixture needle anticlockwise 1 1/2 turns. 6. Turn idle adjust screw (C) anticlockwise and set the screw until the tip to just contact throttle plate. Then turn it clockwise 2 3/4 turns.

9 2-3 Adjusting carburettor SERVICE INFORMATION 9 1. Start engine and warm it up well for about 3-5 minutes with cycle of 5 seconds at WOT (Wide Open Throttle) and 10 seconds at idling. 2. Adjust L mixture needle and obtain maximum idle speed with 2.5 mm wide blade head screw driver (D). 3. Set idle speed to 3,800 r/min by turning idle adjust screw. D 4. Turn L mixture needle anticlockwise to reduce idle speed 1,000 r/min to set idle speed in the range of 2,600 to 3,000 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. Turn H mixture needle clockwise to maximum WOT engine speed then turn the H mixture needle clockwise further until engine speed drops 100 to 200 r/min. 6. Immediately return the H mixture needle anticlockwise to obtain maximum WOT engine speed with smooth and clear engine sound. Then turn the H mixture needle anticlockwise 1/8-1/4 turn further. 7. After adjusting carburettor, install Red limiter cap on H mixture needle and White limiter cap on L mixture needle to the rich side stop as shown. NOTE : Before installing limiter caps, warm caps in 90 C hot water for smooth installation. Make it sure to use pliers or appropriate instrument to take warmed up cap out from the water. (Continued)

10 10 SERVICE INFORMATION 2-3 Adjusting carburettor (Continued) 8. Press respective limiter caps to the bottoms using bar tool like T hex. wrench (E). IMPORTANT : The limiter caps must be installed on L and H mixture needles to comply with Emission Directive. 9. Start engine again and make it sure engine runs in the range of 2,400 to 3,200 r/min at idling and the range of 7,900 to 8,500 r/min at WOT. Also make it sure cutting device would not turn at engine idle speed and suitable acceleration. E NOTE : Initial carburettor setting (Idle adjust screw, L and H mixture needles) shown here is to start the engine after restoration or carburettor change. Idle adjust screw, L and H mixture needles turn for designated engine revolution through procedures indicated here may vary. As long as idle and WOT engine speed is set in given range, the variance would be ignorable.