10-25J-00 SRM-261T 1 INTRODUCTION. Reference No J-00 ISSUED:

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1 10-25J-00 SRM-261T 1 1 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 Special tools CARBURETOR ADJUSTMENT PROCEDURE General adjusting rules Presetting Idle adjust screw, Idle mixture needle and hi speed (H) mixture needle Adjusting carburetor... 8 Reference No J-00 ISSUED:

2 2 SERVICE INFORMATION SRM-261T 1-1 Specifications Dimensions* Length mm (in) 1795 (70.7) Width mm (in) 250 (9.8) Height mm (in) 250 (9.8) Dry weight* kg (lb) 5.4 (11.9) Engine Type KIORITZ, air-cooled, two-stroke, single cylinder Rotation Counterclockwise as viewed from the output end Displacement cm 3 (in 3 ) 25.4 (1.55) Bore mm (in) 34.0 (1.34) Stroke mm (in) 28.0 (1.10) Compression ratio 6.7 Carburetor Type Rotary type : Diaphragm, horizontal-draft, with purge bulb Model Walbro WYK-186 Ignition Type CDI (Capacitor discharge ignition) Spark plug Variable Slope Timing (VST) : Slope advance ignition combined with electronic speed governor in a single integrated piece BPM8Y Exhaust Muffler type Spark arrestor muffler with catalyst Starter Type Automatic rewind Rope diameter x length mm (in) 3.5 x 850 (0.14 x 33.46) Fuel** Type Premixed two-stroke fuel Mixture ratio 50 : 1 (2%) Gasoline Two-stroke engine oil Minimum 89 octane ISO-L-EGD (ISO/CD13738), JASO M345-FC/FD Tank capacity L (U.S.fl.oz.) 0.8 (27.1) Clutch Type Centrifugal, 2-shoe pivot Handle Type Front Crescent loop with cushion grip Rear Integrated control grip with cushion Drive shaft Type Flexible Diameter - Length mm (in) ( ) Housing OD - ID mm (in) ( ) (Main pipe) Length mm (in) 1500 (59.1) Gear case Reduction ratio 2.07 Gear tooth Lubrication Spiral bevel Lithium based grease or ECHO LUBE TM Cutter Type Nylon line cutter, 8-tooth blade, 80-tooth blade, Others Pilot diameter for blade** mm(in) Option : 20.0 (0.79) Fastener type, size mm Left-hand thread nut, M10 x 1.25 pitch Cutting rotation Counterclockwise as viewed from top OD: Outer diameter. ID: Inner diameter. * Without shoulder harness and Nylon line head. ** Refer to Operator s manual. Install blade conversion kit including metal shield when operating with metal blade.

3 SRM-261T SERVICE INFORMATION Technical data Engine Idling speed rpm Wide open throttle speed rpm* Clutch engagement speed rpm Compression pressure MPa (kgf/cm 2 ) (psi) 0.8 (8.2) (116) Ignition Spark plug gap mm (in) ( ) Minimum secondary voltage at 1500 rpm kv 15 Primary coil resistance Ω Secondary coil resistance kω Pole shoe air gaps mm (in) ( ) Ignition timing at 3000 rpm BTDC 25.0 Carburetor* at 8500 rpm BTDC 33.0 at rpm BTDC Below Venturi Size mm(in) 10.5 (0.413) Throttle Bore mm(in) 10.5 (0.413) Idle adjust screw initial setting turn in** 4 1/4 Idle mixture needle initial setting turn in** 14 Test Pressure, minimum MPa (kgf/cm 2 ) (psi) 0.05 (0.5) (7.0) Metering lever height mm (in) 1.65 (0.06) lower than diaphragm seat BTDC: Before top dead center. *With Nylon line cutter and shield. **Set idle speed screw to the point that its tip just contacts throttle plate before initial setting.

4 4 SERVICE INFORMATION SRM-261T 1-3 Torque limits Descriptions Size kgf cm N m in lbf Starter Ignition Fuel Starter pawl assembly M Starter case M 4* Flywheel M Ignition coil M 5* Fan cover M 5* Spark plug M Carburetor M Intake insulator M Fuel tank M 5* Clutch Clutch shoe M Engine Crankcase M Cylinder M Muffler M 5* Exhaust guide M Muffler cover M 5* Top guard M 5* Other Stand Starter side M 5* Fan case side M Cutter fastener LM Regular bolt, nut and screw M LM: Left-hand thread. * Apply thread locking sealant. (See below) M M M M ** The torque differences among four bolts should not exceed 20 kgf cm (2N m, 17in lbf) on one cylinder or crankcase 1-4 Special repairing materials Material Location Remarks Grease Drive shaft Gear case Rewind spring Starter center post Oil seal inner lips Lithium based grease or ECHO LUBE TM Thread locking Starter case sealant Fuel tank Loctite #675 or equivalent Ignition coil Fan cover Top guard Loctite #222, Three Bond #1342 or equivalent Stand Muffler cover Muffler Loctite #242, ThreeBond #1324 or equivalent

5 SRM-261T SERVICE INFORMATION Service limits A B C D 5K243 5K228 5K229 5K230 E F G H 5K231 5K016 5K042 5K244 K L M 5K219 5K171 5K232 Description mm (in) A Cylinder bore When plating is worn and aluminium can be seen B Piston outer diameter Min (1.335) C Piston pin bore Max (0.3161) D Piston ring groove Max. 1.6 (0.063) E Piston ring side clearance Max (0.006) F Piston pin outer diameter Min (0.3142) G Piston ring width Min (0.057) H Piston ring end gap Max. 0.5 (0.02) K Con-rod small end bore Max (0.4341) L Crankshaft runout Max (0.002) M Clutch drum bore Max (2.34)