10-25F-00 SRM-260 SRM-261 Series 1 1 SERVICE DATA TRIMMER/BRUSHCUTTER SRM-260 (Serial number : 05001001~05999999) SRM-260S (Serial number : 05001001~05999999) SRM-260U (Serial number : 05001001~05999999) SRM-260SB (Serial number : 05001001~05999999) SRM-261 (Serial number : 06001001~06999999) SRM-261S (Serial number : 06001001~06999999) SRM-261U (Serial number : 06001001~06999999) SRM-261SB (Serial number : 06001001~06999999) 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... 2 1-1 Specification... 2 1-2 Technical data... 3 1-3 Torque limits... 4 1-4 Special repairing materials... 4 1-5 Service limits... 5 Reference No. 10-25F-00 ISSUED: 200304 KIORITZ CORPORATION
2 SERVICE INFORMATION SRM-260 SRM-261 Series 1-1 Specifications Model SRM-260 SRM-260S SRM-260SB SRM-260U SRM-261 SRM-261S SRM-261SB SRM-261U Dimensions* Length mm(in) 1795 (70.7) 1825 (71.9) 1795 (70.7) Width mm(in) 250 (9.84) 711 (28.0) Height mm(in) 250 (9.84) 478.5 (18.84) Dry weight* kg(lb) 5.12 (11.3) 4.92 (10.8) 5.3 (11.7) 6.5 (14.3) 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 6.2 Carburetor Type Diaphragm, horizontal-draught, with primer Model Walbro WYJ-315A Ignition Type CDI (Capacitor discharge ignition) Spark plug Variable Slope Timing (VST) : Slope advance ignition combined with electronic speed governor BPM8Y Exhaust Muffler type SRM-260, SRM-260S, SRM-260SB, SRM-260U Spark arrestor muffler SRM-261, SRM-261S, SRM-261SB, SRM-261U Spark arrestor muffler with catalyst Starter Type Automatic rewind Rope diameter x length mm(in) 3.5 x 850 (9/ 64 x 33 1/2) Fuel Type Premixed two-stroke fuel (Refer to Operator s manual.) Two-stroke engine oil ISO-L-EGD (ISO/CD13738) and J.A.S.O. FC Standards Tank capacity L (U.S.fl.oz.) 0.58 (19.6) Clutch Type Centrifugal, 2-shoe pivot Handle Type Front Crescent loop with cushion grip Rear Integrated control grip with cushion Drive shaft Type Flexible Solid Flexible Flexible Diameter - Length mm 6.15-1522 7-1540 6.8-802 6.15-1522 (in) (0.242-59.92) (0.28-60.6) (0.268-31.58) (0.242-59.92) Housing OD - ID mm 25-22 25-23.5 25-22 (Main pipe) (in) (0.98-7/8) (0.98-0.93) (0.98-7/8) Length mm(in) 1500 (59.1) 756 (29.8) 1500 (59.1)
SRM-260 SRM-261 Series SERVICE INFORMATION 3 1-1 Specifications (continued) Gear case Reduction ratio 1.4 Gear tooth Lubrication Spiral bevel gear Lithium based grease or ECHO LUBE TM Cutter Type Nylon line cutter, 8-tooth blade, 80-tooth blade, Others Pilot diameter mm(in) 20.0 (0.79) Option Fastener type, size mm Left-hand thread nut, M10 x 1.25 pitch Cutting rotation OD: Outer diameter. ID: Inner diameter. Counterclockwise as viewed from top * Without shoulder harness and Nylon line head. ** Refer to Operator s manual. Install and use U-shaped handle and metal blade kit when operating any model with blade. 1-2 Technical data Engine Idling speed r/min 2400-3200 Wide open throttle speed r/min 8500 Engine speed at beginning of clutch engagement r/min 3400-4000 Compression pressure Mpa (kgf/cm 2 ) (psi) 0.85 (8.5) (120) Ignition Spark plug gap mm (in) 0.6-0.7 (0.024-0.028) Minimum secondary voltage at 1500 r/ min kv 13 Secondary coil resistance ký 2.4-3.2 Pole shoe air gaps mm (in) 0.30-0.40 (0.012-0.016) Ignition timing at 1000r/min BTDC 16.5 at 3000r/min BTDC 25.0 at 8500r/min BTDC 33.0 at 11000r/min BTDC 13.0 Carburetor Venturi Size mm(in) 12.2 (0.48) Throttle Bore mm(in) 12.2 (0.48) Main jet #41.5 Test Pressure, minimum MPa (kgf/cm 2 ) (psi) 0.05 (0.5) (7.0) Metering lever height mm (in) 1.35 (0.053) lower than diaphragm seat BTDC: Before top dead center.
4 SERVICE INFORMATION SRM-260 SRM-261 Series 1-3 Torque limits Descriptions Size kgf cm N M in lbf Starter Ignition Fuel Starter pawl assembly M 8 80-100 8-10 70-90 Starter case M 4* 14-28 1.4-2.8 12-25 Flywheel M 8 160-200 16-20 140-175 Ignition coil M 5* 40-60 4-6 35-50 Fan cover M 5* 30-45 3.0-4.5 25-40 Spark plug M 14 150-170 15-17 130-150 Carburetor M 5 30-45 3.0-4.5 25-40 Intake insulator M 5 50-70 5-7 43-60 Fuel tank M 5* 30-45 3.0-4.5 25-40 Clutch Clutch shoe M 6 70-110 7-11 60-95 Engine Crankcase M 5 70-110 7-11 60-95 Cylinder M 5 70-110 7-11 60-95 Muffler M 5* 90-110 9-11 80-95 Exhaust guide M 4 12-18 1.2-1.8 10-15 Muffler cover M 5* 20-35 2.0-3.5 17-30 Top guard M 5* 30-45 3.0-4.5 25-40 Other Stand Starter side M 5* 20-30 2-3 17-25 Regular bolt, nut, and screw Fan case side M 5* 30-45 3.0-4.5 25-40 Cutter fastener LM 10 280-320 28-32 245-280 *Apply thread locking sealant. (See below) M 3 6-10 0.6-1.0 5-9 M 4 15-25 1.5-2.5 13-22 M 5 25-45 2.5-4.5 22-40 M 6 45-75 4.5-7.5 40-65 M 8 110-150 11-15 95-130 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 #648 or equivalent Ignition coil Fan cover Top guard Loctite #222, Three Bond #1342 or equivalent Stand Muffler cover Muffler Loctite #242, ThreeBond #1327 or equivalent
SRM-260 SRM-261 Series SERVICE INFORMATION 5 1-5 Service limits Description mm (in) Cylinder bore When plating is worn and aluminum can be seen Piston outer diameter Min. 33.91 (1.335) Piston pin bore Max. 8.030 (0.316) Piston ring groove Max. 1.6 (0.063) Piston ring side clearance Max. 0.1 (0.004) Piston pin outer diameter Min. 7.98 (0.314) Piston ring width Min. 1.45 (0.057) Piston ring end gap Max. 0.5 (0.02) Con-rod small end bore Max. 11.02 (0.43) Crankshaft runout Max. 0.05 (0.002)