INTRODUCTION. Reference No S-01 REVISED:

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1 10-21S-01 GT-225, SRM 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. ECHO SERVICE MANUAL Ord (Model : GT-225, SRM-225) contains lots of information for servicing this model. NOTE : Corrected tightening torque of muf er cover on page 4. CONTENTS page 1 SERVICE INFORMATION Speci cation 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 mixture needle Adjusting carburetor... 8 Reference No S-01 REVISED: ISSUED:

2 2 SERVICE INFORMATION GT-225 SRM SERVICE INFORMATION 1-1 Speci cations Model GT-225 SRM-225 Dimensions* Length mm (in) 1371 (54.0) 1793 (70.6) Width mm (in) 315 (12.4) 251 (9.9) Height mm (in) 539 (21.2) 328 (12.9) Dry weight* kg (lb) 4.6 (10.1) 5.5 (12.1) Engine Type KIORITZ, air-cooled, two-stroke, single cylinder Rotation Counterclockwise 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 5.9 Carburetor Type Rotary type : Diaphragm, horizontal-draft, with purge bulb Model ZAMA RB-K93 Ignition Type CDI (Capacitor discharge ignition) system Variable Slope Timing (VST) : Slope advance ignition system combined with electronic speed governor Spark plug BPM8Y (CANADA : BPMR8Y) Exhaust Muf er type Spark arrester muf er with catalyst Starter Type i-30 Rope diameter x length mm (in) 3.0 x 830 (0.12 x 32.7) Fuel** Type Premixed two-stroke fuel Mixture ratio 50 : 1 (2%) Gasoline Minimum 89 octane Two-stroke engine oil ISO-L-EGD (ISO/CD13738), JASO M345-FC/FD Tank capacity L (U.S..oz.) 0.44 (14.9) Clutch Type Centrifugal, 2-shoe pivot Handle Type Front Loop handle Rear Integrated control grip Integrated control grip with throttle lock lever Drive shaft Type Flexible Diameter - Length mm (in) ( ) ( ) Housing OD - ID mm (in) ( ) ( ) Main pipe Length mm (in) 1130 (44.5) 1500 (59.1) Gear case Reduction ratio Gear tooth --- Spiral bevel gear Lubrication Lithium based grease or ECHO LUBE TM Cutter Type Nylon line cutter, 8-tooth blade, 22-tooth blade, Others Pilot diameter for blade mm(in) Not available Option : 20.0 (0.79) Fastener type, size mm Not available Left-hand thread nut, M10 x 1.25 pitch Cutting rotation Clockwise as viewed from top Counterclockwise as viewed from top OD: Outer diameter. ID: Inner diameter. * Without shoulder harness and Nylon line head. ** Refer to Operators manual. Install blade conversion kit including metal shield when operating with metal blade.

3 GT-225 SRM-225 SERVICE INFORMATION Technical data Model GT-225 SRM-225 Engine Idling speed rpm 2,900 +/- 400 Wide open throttle speed rpm* 6,900-8,100 7,600-8,700 Clutch engagement speed rpm 3,850-4,100 Compression pressure MPa (kgf/cm 2 ) (psi) 0.66 (6.7) (96) Ignition system Spark plug gap mm(in) ( ) Minimum secondary voltage at 1500 rpm kv 15 Primary coil resistance Secondary coil resistance k Pole shoe air gaps mm(in) ( ) Ignition timing at 1,000 rpm BTDC 17 at 3,000 rpm BTDC 27 at 8,000 rpm BTDC 42 PET-9000 Parameter #1 298 #2 03 Carburetor Venturi Size mm(in) 9.0 (0.354) Throttle Bore mm(in) 10.5 (0.413) Idle adjust screw initial setting turn in** 2 1/2 2 3/8 Idle mixture needle initial setting turn back*** 2 7/8 2 5/8 Hi speed mixture needle initial setting turn back*** 3/4 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 center. *With Nylon line cutter and shield. ** Set idle speed screw to the point that its tip just contacts throttle plate before initial setting. ***Turn Idle/Hi speed mixture needles counterclockwise from point that needle is lightly seated.

4 4 SERVICE INFORMATION GT-225 SRM Torque limits Descriptions Size kgfcm Nm inlbf Starter Starter pawl assembly M system Starter case M 4* Ignition Flywheel M system Ignition coil M Fan cover M Spark plug M Fuel Carburetor M system Intake insulator M 5* Fuel tank with stand M 5* Cylinder cover Fan cover side M Starter side M Engine Crankcase M Cylinder M Muf er M 5* Exhaust guide M Muf er cover Fan cover side M 5* Starter side M Other Cutter fastener LM Regular bolt, nut and screw M LM: Left-hand thread. Tapping screw M M M M * Apply thread locking sealant. (See below) ** The torque differences among four bolts should not exceed 20 kgfcm (2Nm, 17inlbf) on one cylinder or crankcase 1-4 Special repairing materials Material Location Remarks Grease Drive shaft Gear case Rewind spring Lithium based grease or ECHO LUBE TM Starter center post Oil seal inner lips Thread locking Starter case sealant Muf er Muf er cover Loctite #242, ThreeBond #1324 or equivalent Fuel tank Intake insulator Loctite #675

5 GT-225 SRM-225 SERVICE INFORMATION Service limits A B C D E F G H K L M Description mm (in) A Cylinder bore When plating is worn and aluminum can be seen B Piston outer diameter Min (1.264) C Piston pin bore Max (0.3161) D Piston ring groove Max (0.063) E Piston ring side clearance Max (0.004) F Piston pin outer diameter Min (0.3138) G Piston ring width Min (0.057) H Piston ring end gap Max (0.02) K Con-rod small end bore Max (0.4724) L Crankshaft runout Max (0.001) M Clutch drum bore Max (2.03)

6 6 SERVICE INFORMATION GT-225 SRM Special tools Key Part Number Description Used for: Tachometer PET-1000 Measuring engine speed Washer Installing crankcase oil seal 3 X Torx L wrench Removing and installing bolt PTO shaft puller Removing driven (PTO) shaft Bearing wedge Removing ball bearings on crankshaft Bearing tool Removing and installing crankcase ball bearings Piston pin tool Removing and installing piston pin (Use 8 mm dia. adapter.) Module air gap gauge Adjusting pole shoe air gaps pin wrench Removing and installing pawl carrier Limiter plug tool Removing and installing plug Oil seal tool Installing crankcase oil seals Spark tester Checking ignition system Pressure tester Checking carburetor and crankcase leakages Retaining ring pliers Removing and installing retaining ring Bolt Removing magneto rotor ( ywheel) Flange nut Removing magneto rotor ( ywheel) Compression gauge Measuring cylinder compression Ignition Analyzer : PET-9000 Measuring Ignition timing, Primary/Secondary voltage