SRM-260 SRM-261 Series 1

10-25F-00 SRM-260 SRM-261 Series 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 CONTENTS page We are constantly working on technical 1 SERVICE INFORMATION ...... 2 improvement of our products. For this reason, 1-1 Specification ...... 2 technical data, equipment and design are 1-2 Technical data ...... 3 subject to change without notice. All 1-3 Torque limits ...... 4 1-4 Special repairing materials ...... 4 specifications and directions in this SERVICE 1-5 Service limits ...... 5 DATA are based on the latest products information available at the time of publication. 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 cm3(in3) 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) system Variable Slope Timing (VST) : Slope advance ignition system combined with electronic speed governor Spark plug 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 Spiral bevel gear TM Lubrication Lithium based grease or ECHO LUBE 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 Counterclockwise as viewed from top OD: Outer diameter. ID: Inner diameter. * 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/cm2 ) (psi) 0.85 (8.5) (120) Ignition system 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) Ignitio n 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/cm2) (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 Starter pawl assembly M 8 80 - 100 8 - 10 70 - 90 system Starter case M 4* 14 - 28 1.4 - 2.8 12 - 25 Ignition Flywheel M 8 160 - 200 16 - 20 140 - 175 system 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 Fuel Carburetor M 5 30 - 45 3.0 - 4.5 25 - 40 system 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 Fan case side M 5* 30 - 45 3.0 - 4.5 25 - 40 Cutter fastener LM 10 280 - 320 28 - 32 245 - 280 Regular bolt, nut, M 3 6 -10 0.6 - 1.0 5 - 9 and screw 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 *Apply thread locking sealant. (See below)

1-4 Special repairing materials

Material Location Remarks Grease Drive shaft Gear case TM Lithium based grease or ECHO LUBE Rewind spring Starter center post Oil seal inner lips Thread locking Starter case Loctite #648 or equivalent sealant Fuel tank 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)