Honda GX25 Manual
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Honda GX25 Manual

Honda GX25 Manual

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How to use this manual
A Few Words About Safety
How to use this manual
SERVICE INFORMATION
The service and repair information contained in this manual is intended for use by qualified, professional technicians. Attempting
service or repairs without the proper training, tools, and equipment could cause injury to you and/or others. It could also damage
this Honda product or create an unsafe condition.
This manual describes the proper methods and procedures for performing service, maintenance, and repairs. Some procedures
require the use special tools. Any person who intends to use a replacement part, service procedure or a tool that is not
recommended by Honda, must determine the risks to their personal safety and the safe operation of this product.
If you need to replace a part, use Honda Genuine parts with the correct part number or an equivalent part. We strongly recommend
that you do not use replacement parts of inferior quality.
For Your Customer's Safety
Proper service and maintenance are essential to the customer's safety and the reliability of this product. Any error or oversight
while servicing this product can result in faulty operation, damage to the product, or injury to others.
Improper service or repairs can create an un-
safe condition that can cause your customer or
others to be seriously hurt or killed.
Follow the procedures and precautions in this
manual and other service materials carefully.
For Your Safety
Because this manual is intended for the professional service technician, we do not provide warnings about many basic shop safety
practices (e.g., Hot parts-wear gloves). If you have not received shop safety training or do not feel confident about your knowledge
of safe servicing practice, we recommend that you do not attempt to perform the procedures described in this manual.
Some of the most important general service safety precautions are given below. However, we cannot warn you of every
conceivable hazard that can arise in performing service and repair procedures. Only you can decide whether or not you should
perform a given task.
Failure to properly follow instructions and pre-
cautions can cause you to be seriously hurt or
killed.
Follow the procedures and precautions in this
manual carefully.
Important Safety Precautions
Make sure you have a clear understanding of all basic shop safety practices and that you are wearing appropriate clothing and
using safety equipment. When performing any service task, be especially careful of the following:
• Read all of the instructions before you begin, and make sure you have the tools, the replacement or repair parts, and the skills
required to perform the tasks safely and completely.
• Protect your eyes by using proper safety glasses, goggles, or face shields anytime you hammer, drill, grind, or work around
pressurized air, pressurized liquids, springs or other stored-energy components. If there is any doubt, put on eye protection.
• Use other protective wear when necessary, for example gloves or safety shoes. Handling hot or sharp parts can cause severe
burns or cuts. Before you grab something that looks like it can hurt you, stop and put on gloves.
• Protect yourself and others whenever you have engine-power equipment up in the air. Anytime you lift this product with a hoist,
make sure that the hoist hook is securely attached to the product.
Make sure the engine is off before you begin any servicing procedures, unless the instruction tells you to do otherwise. This will
help eliminate several potential hazards:
• Carbon monoxide poisoning from engine exhaust. Be sure there is adequate ventilation whenever you run the engine.
• Burns from hot parts. Let the engine and exhaust system cool before working in those areas.
• Injury from moving parts. If the instruction tells you to run the engine, be sure your hands, fingers and clothing are out of the way.
Gasoline vapors and hydrogen gasses from battery are explosive. To reduce the possibility of a fire or explosion, be careful when
working around gasoline or batteries.
• Use only a nonflammable solvent, not gasoline, to clean parts.
• Never store gasoline in an open container.
• Keep all cigarettes, sparks, and flames away from the battery and all fuel-related parts.
0-1

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  • Page 1 Honda, must determine the risks to their personal safety and the safe operation of this product. If you need to replace a part, use Honda Genuine parts with the correct part number or an equivalent part. We strongly recommend that you do not use replacement parts of inferior quality.

  • Page 2: Table Of Contents

    You CAN be HURT if you don’t follow instructions. • Instructions — how to service this engine correctly and safely. Honda Motor Co., Ltd. Service Publications Office PSV61Z0H00E6.2019.01 Revised: August 2009 © American Honda Motor Co., Inc.
  • Page 3 Supplement Z is located after the base manual section of this book. Use the following table to determine if this supplement applies to your model. Applicable Shop Manual Sections Base Supplement Z Model Information common to all models Information unique to the GX25 (WA, TA2 types) • GX25 • • GX25...
  • Page 4 Actual power output for the engine installed in the final machine will vary depending on numerous factors, including the operating speed of the engine in application, environmental conditions, maintenance, and other variables. Revised: July 2017 (PSV61Z0H00E5) © American Honda Motor Co., Inc.

  • Page 6: Wiring Diagram

    99 (3.9) 122 (4.8) 82 (3.2) 110 (4.3) 58 (2.3) (0.6) 50 (2.0) 4. WIRING DIAGRAM Black UNIT lgnition switch on the equipment powered by the engine SPARK PLUG IGNITION COIL Date of Issue: August, 2002 © Honda Motor Co., Ltd.
  • Page 7 GX25 Date of Issue: August, 2002 © Honda Motor Co., Ltd.

  • Page 8: Symbols Used In This Manual

    The engine serial number is located on the cylinder block near the fuel tank. Refer to the engine serial number when ordering parts and when making technical inquiries. ENGINE SERIAL NUMBER Date of Issue: August, 2002 © Honda Motor Co., Ltd.
  • Page 9 Ignition coil Resistance Primary coil ———— Secondary coil 6.1 – 9.3 kΩ ———— Air gap (at flywheel) 0.3 – 0.5 (0.012 – 0.020) ———— Lining thickness 2.0 (0.08) 1.0 (0.04) Clutch Date of Issue: August, 2002 © Honda Motor Co., Ltd.

  • Page 10: Standard Torque Values

    • STANDARD TORQUE VALUES Torque values Item Thread Dia. N·m kgf·m lbf·ft Screw 3 mm 4 mm Flange bolt and nut 4 mm 5 mm 6 mm CT flange bolt 5 mm Date of Issue: August, 2002 © Honda Motor Co., Ltd.
  • Page 11  Guide 07VPF-ZM3030A Piston pin installation  Rocker arm replacement tool 070PF-Z0HA100 Rocker arm removal/installation      Revised: March, 2015 Date of Issue: February, 2005 © American Honda Motor Co., Inc. © American Honda Motor Co., Inc.

  • Page 12: Troubleshooting

    SPARK PLUG faulty. Inspect: P. 3-3 AIR CLEANER clogged. Clean: P. 3-3 VALVE CLEARANCE incorrect. Readjust: P. 3-4 CYLINDER, PISTON or PISTON Disassemble: P. 9-1 RINGS worn. Inspect: P. 9-6 and 7 Date of Issue: August, 2002 © Honda Motor Co., Ltd.
  • Page 13 Poor performance at low speed. CARBURETOR clogged. Readjust: P. 3-5 Disassemble/Clean: P. 4-3 and 4 AIR CLEANER clogged. Clean: P.3-3 SPARK PLUG faulty. Inspect: P. 3-3 VALVE CLEARANCE incorrect. Readjust: P. 3-4 Date of Issue: August, 2002 © Honda Motor Co., Ltd.
  • Page 14 Do not touch the flywheel fins when pulling the recoil starter. Cylinder 0.9 – 1.1 MPa (9.2 – 11.2 kgf/cm compression 131 – 159 psi) at 2,000 min (rpm) Date of Issue: August, 2002 © Honda Motor Co., Ltd.
  • Page 15 • Check for worn piston, piston rings or cylinder (P. 9-6 and 7). 7. Check for a plugged spark arrester. Plugged Clean or replace as necessary (P. 3-6). Normal 8. Start the engine according to the starting procedure. Date of Issue: August, 2002 © Honda Motor Co., Ltd.
  • Page 16 (P. 4-3 and 4). Normal 5. Check for a plugged spark arrester. Plugged Clean or replace as necessary (P. 3-6). Normal 6. Start the engine according to the starting procedure. Date of Issue: August, 2002 © Honda Motor Co., Ltd.

  • Page 17: Ignition System

    3) Install the removed spark plug on the plug cap. 4) Ground the negative (–) electrode of the spark plug to the engine block. Pull the recoil starter to check for sparks. Date of Issue: August, 2002 2-10 © Honda Motor Co., Ltd.
  • Page 18 Lever not operating properly Metering lever spring Spring deformed Spring not installed properly Metering diaphragm Diaphragm damaged Gasket faulty Inlet needle valve Stuck valve Worn valve Foreign matter stuck in valve Date of Issue: August, 2002 2-11 © Honda Motor Co., Ltd.
  • Page 19 GX25 Date of Issue: August, 2002 2-12 © Honda Motor Co., Ltd.

  • Page 20: Maintenance Schedule

    Every 2 years (Replace if necessary) • Emission related items. (1) Service more frequently when used in dusty areas. (2) For commercial use, log hours of operation to determine proper maintenance intervals. Date of Issue: August, 2002 © Honda Motor Co., Ltd.

  • Page 21: Engine Oil

    (23 °F ~ 104 °F) ambient temperature The SAE oil viscosity and service classification are in the APl label on the oil container. Honda recommends that you use API SERVICE category SJ oil. 4) Tighten the oil filler cap securely.

  • Page 22: Spark Plug

    1) Remove the 5 x 12 mm hex bolt and top cover. 2) Clean any dirt from around the spark plug. SPARK PLUG 3) Remove the plug cap, and use a spark plug wrench to remove the plug. SPARK PLUG WRENCH Date of Issue: August, 2002 © Honda Motor Co., Ltd.

  • Page 23: Valve Clearance

    • Engine oil can leak out when removing the head cover. HEAD Catch the leaking oil with a suitable material and wipe up BOLT (2) COVER the area immediately. ENGENE ASSEMBLY Date of Issue: August, 2002 © Honda Motor Co., Ltd.
  • Page 24 Loosen the fuel tank cap and release the pressure from the tank before operation. 1) Drain the fuel tank and remove the recoil starter (P. 5-1). 2) Remove the fuel tank. Date of Issue: August, 2002 © Honda Motor Co., Ltd.

  • Page 25: Spark Arrester

    4) Replace the spark arrester if there are any breaks or tears. 5) Install the spark arrester. muffler cover, top cover and recoil starter in the reverse order of removal. Date of Issue: August, 2002 © Honda Motor Co., Ltd.

  • Page 26: Air Cleaner/Carburetor

    Before installing the breather line check for COLLAR (2) deterioration or damage. Replace if necessary. SHORT 5 mm FLANGE NUT (2) CYLINDER BLOCK AIR CLEANER CASE LONG AIR CLEANER COVER Date of Issue: August, 2002 © Honda Motor Co., Ltd.
  • Page 27 2) Remove the air cleaner (P. 4-1). CARBURETOR GASKET Do not reuse. 14.8 x 2.4 mm O-RING TUBE CLIP CARBURETOR ASSEMBLY DISASSEMBLY/REASSEMBLY: P. 4-3, P. 4-4. ADJUSTMENT: P. 3-5, P. 4-5 Date of Issue: August, 2002 © Honda Motor Co., Ltd.
  • Page 28 REASSEMBLY: Replace the pump diaphragm if it is deteriorated or damaged. INLET SCREEN REASSEMBLY: Remove dust and other foreign material from the screen before installation. FUEL RETURN TUBE INSTALLATION PIPE Date of Issue: August, 2002 © Honda Motor Co., Ltd.
  • Page 29 ADJUSTMENT: P. 4-5 of fuel leakage. PUMP BODY REASSEMBLY: Wash the passage with nonflammable solvent to remove dust and other foreign material before installation. Do not clean by blowing air. Date of Issue: August, 2002 © Honda Motor Co., Ltd.
  • Page 30 Specification 1.18 – 1.50 mm (0.046 – 0.059 in) METERING LEVER PUMP BODY 3) If the measurement is outside the specification, adjust by bending the metering lever. Date of Issue: August, 2002 © Honda Motor Co., Ltd.
  • Page 31 GX25 Date of Issue: August, 2002 © Honda Motor Co., Ltd.

  • Page 32: Recoil Starter

    RECOIL STARTER SPRING DISASSEMBLY: Take care not to allow the recoil starter spring to pop out. Wear RECOIL STARTER HANDLE gloves during operation. REASSEMBLY: P. 5-2 RECOIL STARTER CASE Date of Issue: August, 2002 © Honda Motor Co., Ltd.
  • Page 33 HOOK RECOIL STARTER REEL 4) Hold the starter case and rotate the starter reel three turns in the direction of the arrow for preliminary winding. Date of Issue: August, 2002 © Honda Motor Co., Ltd.
  • Page 34 • Make sure to align the projection of the swing arm collar SWING ARM with swing arm. SWING ARM COLLAR 7) Pull the starter handle several times to make sure the swing arm operates properly. Date of Issue: August, 2002 © Honda Motor Co., Ltd.
  • Page 35 Pre-2010 year: 0.55 l (0.15 US gal, 0.12 Imp gal) Low-perm horizontal type: 0.53 l (0.14 US gal, 0.12 Imp gal) Low-perm vertical type: 0.54 l (0.14 US gal, 0.12 Imp gal) Revised: February 2010 (PSV61Z0H00E2-A) ©American Honda Motor Co., Inc.
  • Page 36 NUT (2) 5 mm SPARK ARRESTER HEX BOLT 4 x 6 mm REASSEMBLY: SCREW (2) AIR EXHAUST Install after removing the GUIDE carbon form the screen with a wire brush. Date of Issue: August, 2002 © Honda Motor Co., Ltd.
  • Page 37 GX25 Date of Issue: August, 2002 © Honda Motor Co., Ltd.

  • Page 38: Starter Pulley

    REASSEMBLY: Holding the recoil starter pulley in the same manner as on disassembly, tighten the flywheel to the specified torque. TORQUE: 6.4 N•m (0.7 kgf•m, 5.1 lbf•ft) DRIVER TORQUE WRENCH Date of Issue: August, 2002 © Honda Motor Co., Ltd.
  • Page 39 7 mm CLUTCH WASHER (2) CLUTCH ASSEMBLY FLYWHEEL CLUTCH DISASSEMBLY/ SIDE SIDE REASSEMBLY: P. 7-3 FAN COVER INSPECTION: P. 7-4 5 x 20 mm HEX BOLT (3) 6.4 N•m (0.7 kgf•m, 4.6 lbf•ft) Date of Issue: August, 2002 © Honda Motor Co., Ltd.
  • Page 40 7 mm flange nut from the flywheel. 2) Remove the flywheel using a commercially available flywheel puller. NOTICE Do not remove the flywheel by tapping it with a hammer. FLYWHEEL PULLER (Commercially available) Date of Issue: August, 2002 © Honda Motor Co., Ltd.

  • Page 41: Strap Wrench

    Resistance 6.1 – 9.3 kΩ • CLUTCH ASSEMBLY Measure the thickness at the center of the clutch lining. Standard Service limit 2.0 mm (0.08 in) 1.0 mm (0.04 in) Date of Issue: August, 2002 © Honda Motor Co., Ltd.

  • Page 42: Ignition Coil Air Gap

    • Adjust both gaps at the right and left sides of the ignition coil simultaneously so they are equal. 0.3 – 0.5 mm (0.012 – 0.020 in) 0.3 – 0.5 mm (0.012 – 0.020 in) MAGNETIC PARTS Date of Issue: August, 2002 © Honda Motor Co., Ltd.
  • Page 43 GX25 Date of Issue: August, 2002 © Honda Motor Co., Ltd.
  • Page 44 HEAD COVER Check that the belt is not SEAL worn or cracked and do not bend or twist the belt. CAM PULLEY INSPECTION: P. 9-8 CAM PULLEY SHAFT INSPECTION: P. 9-8 Date of Issue: August, 2002 © Honda Motor Co., Ltd.

  • Page 45: Cam Pulley

    3) Push the cam pulley shaft out from the valve spring side using a pin approximately 2 mm in diameter. CAM PULLEY SHAFT 4) Remove the timing belt from the cam pulley, and remove CAM PULLEY the cam pulley. TIMING BELT Date of Issue: August, 2002 © Honda Motor Co., Ltd.
  • Page 46 OIL RETURN PASSAGES INSPECTION: INSIDE OUTSIDE <Oil passage> Check the oil return passages of the cylinder head inner cover for restrictions. If they are restricted, clean with compressed air. SIDE Date of Issue: August, 2002 © Honda Motor Co., Ltd.
  • Page 47 HEX BOLT (2) 6.4 N•m (0.7 kgf•m, 5.1 lbf•ft) D13.0 TUBE CLIP (2) 3 x 5 mm SCREW 5 x 30 mm HEX BOLT (4) 6.4 N•m (0.7 kgf•m, 5.1 lbf•ft) Date of Issue: August, 2002 © Honda Motor Co., Ltd.
  • Page 48 2) Apply a bead [ø1.0 -1.5 mm (ø0.04 - 0.06 in)] of liquid gas- ket (Honda bond 4, ThreeBond #1216, 1216E or equiva- lent) to the cylinder block; specifically, to the mating sur- face with the lower crankcase.
  • Page 49 Set the 5 x 75 mm bolts on the shroud. Take care not to allow the bolt heads to protrude from the shroud when installing on the cylinder block. Do not allow the bolts to protrude. Date of Issue: August, 2002 © Honda Motor Co., Ltd.

  • Page 50: Crankshaft/Piston/Cylinder Block/Valves

    REASSEMBLY: P. 9-2 and 3 Install with the “ ” mark 10 mm (0.4 in) on the piston head facing CRANKSHAFT the carburetor side. INSPECTION: P. 9-4 REASSEMBLY: P. 9-4 Date of Issue: August, 2002 © Honda Motor Co., Ltd.
  • Page 51 07VPF–ZM3020A Guide [7] 07VPF–ZM3030A REASSEMBLY: Set the piston pin [1] over the special tool (push rod) and install the special tool (guide). TOOLS: Push rod [2] 07VPF–ZM3020A Guide [3] 07VPF–ZM3030A Date of Issue: September, 2014 © Honda Motor Co., Ltd.
  • Page 52 If the right and left gaps are not equal, raise or lower the piston pin as needed. Date of Issue: September 2014 © American Honda Motor Co., Inc.
  • Page 53 OIL SEAL 2) Install by aligning the oil seal projection with the groove in the cylinder block. CRANK SHAFT 3) Install the lower crankcase (P. 8-5). PROJECTION CYLINDER GROOVE BLOCK Date of Issue: August, 2002 © Honda Motor Co., Ltd.
  • Page 54 INSPECTION: P. 9-9 valve. INSTALLATION: Before installation, remove the Do not interchange with carbon deposits and inspect the the exhaust valve. valve. Revised: March, 2015 Date of Issue: February, 2005 © American Honda Motor Co., Inc. © American Honda Motor Co., Inc.
  • Page 55 Service limit 0.015 – 0.056 mm 0.120 mm Top/Second (0.0006 – 0.0022 in) (0.0047 in) When any piston ring exceeds the service limit, replace all the piston rings as set. Date of Issue: August, 2002 © Honda Motor Co., Ltd.
  • Page 56 0.070 mm (0.0004 – 0.0013 in) (0.0028 in) • CONNECTING ROD SMALL END I.D. Standard Service limit 7.978 – 7.989 mm Replace if exceeding (0.3141 – 0.3145 in) the standard value. Date of Issue: August, 2002 © Honda Motor Co., Ltd.

  • Page 57: Cam Height

    Measure the free length of the valve spring. Standard Service limit 20.66 mm (0.8134 in) 20.00 mm (0.7874 in) Replace the springs if they are shorter than the service limit. Date of Issue: August, 2002 © Honda Motor Co., Ltd.

  • Page 58: Valve Guide I.d

    • Be sure to insert thick paper into the cylinder to protect the inner wall of the cylinder during cleaning of the combustion chamber. • Do not press the cleaning brush with force against the combustion chamber. Date of Issue: August, 2002 © Honda Motor Co., Ltd.
  • Page 59 The valve lifters and rocker arms cannot be reused after they are pressed apart. Always replace with new parts. Revised: March, 2015 Date of Issue: February, 2005 9-10 © American Honda Motor Co., Inc. © American Honda Motor Co., Inc.
  • Page 60 Check that the projection on the valve lifter and the rocker arm are in contact with the installation guide rib of the cylinder head. Revised: March, 2015 Date of Issue: February, 2005 9-11 © American Honda Motor Co., Inc. © American Honda Motor Co., Inc.
  • Page 61 5. Using a 14 mm wrench [1], tighten the push rod [2] until the rocker arm [3] comes to the cylinder head cover installation part. [4] Revised: March, 2015 Date of Issue: February, 2005 9-12 © American Honda Motor Co., Inc. © American Honda Motor Co., Inc.
  • Page 62 Install the adjusting screws and the adjusting screw lock nuts to the rocker arms. Install the cam pulley (P. 8-2). Adjust the valve clearance (P. 3-4). Revised: March, 2015 Date of Issue: February, 2005 9-13 © American Honda Motor Co., Inc. © American Honda Motor Co., Inc.
  • Page 63 NOTES Revised: March, 2015 Date of Issue: February, 2005 9-14 © American Honda Motor Co., Inc. © American Honda Motor Co., Inc.
  • Page 64 SPARK PLUG ..............3-3 SPECIAL TOOLS............2-4 STARTER PULLEY............7-1 SYMBOLS USED IN THIS MANUAL......2-1 TOP COVER ..............6-1 TORQUE VALUES ............2-3 TROUBLESHOOTING........... 2-5 VALVE CLEARANCE............. 3-4 WIRING DIAGRAM............1-3 Date of Issue: August, 2002 10-1 © Honda Motor Co., Ltd.
  • Page 66 SHOP MANUAL GX25 WA, TA2 ENGINE Supplement Z to the GX25 Engine Shop Manual 61Z0H00Z © 1972- 2014 American Honda Motor Co., Inc.—All Rights Reserved...
  • Page 67 Honda must determine the risks to their personal safety and the safe operation of the equipment. If you need to replace a part, use Honda Genuine parts with the correct part number or an equivalent part. We strongly recommend that you do not use replacement parts of inferior quality.

  • Page 68: All Information Contained In This Manual Is Based On

    INTRODUCTION CONTENTS This supplement describes the major differences between OUTLINE OF CHANGES the Honda GX25 engine (SA2 and SAT types) and GX25 engines (WA and TA2 types). SPECIFICATIONS For service information which is not covered in this supplement, please refer to the GX25 base shop manual SERVICE INFORMATION (part number 61Z0H00).
  • Page 69 GX25 Date of lssue: December, 2002 © Honda Motor Co., Ltd.

  • Page 70: Outline Of Changes

    Insulator gasket GASKET GASKET CARBURETOR INSULATOR Fuel tank FUEL TANK FUEL TANK PROTECTOR (SAT type) 5 x 30 mm FUEL TANK HEX BOLT (2) 5 x 16 mm HEX BOLT (2) Date of lssue: December, 2002 © Honda Motor Co., Ltd.
  • Page 71 GX25 Item Control assembly WA type only Date of lssue: December, 2002 © Honda Motor Co., Ltd.
  • Page 72 Air exhaust guide/ AIR EXHAUST Muffler/Spark arrester GUIDE MUFFLER COMP. AIR EXHAUST GUIDE MUFFLER COMP. BAFFLE FLANGE SPARK ARRESTER (Equipped type only) 3 x 6 mm TAPPING SCREW Ignition coil Date of lssue: December, 2002 © Honda Motor Co., Ltd.
  • Page 73 6 x 22 (2) WA type only 6001 RADIAL BALL BEARING FAN COVER FLYWHEEL CLUTCH BOLT (2) SA2 and SAT types 7 mm CLUTCH WASHER (2) CLUTCH ASSEMBLY FAN COVER Date of lssue: December, 2002 © Honda Motor Co., Ltd.

  • Page 74: Specifications

    Actual power output for the engine installed in the final machine will vary depending on numerous factors, including the operating speed of the engine in application, environmental conditions, maintenance, and other variables. Revised: July 2017 (PSV61Z0H00E5) © American Honda Motor Co., Inc.

  • Page 75: Dimensional Drawings

    GX25 2. DIMENSIONAL DRAWINGS Unit: mm (in) WA type: ENGINE PTO SHAFT: Date of lssue: December, 2002 © Honda Motor Co., Ltd.
  • Page 76 GX25 TA2 type: Unit: mm (in) Date of lssue: December, 2002 © Honda Motor Co., Ltd.
  • Page 77 GX25 Date of lssue: December, 2002 © Honda Motor Co., Ltd.

  • Page 78: Maintenance Standards

    6001 radial ball bearing installation (WA type only) Driver 07749-0010000 Driver for 1 and 3 (WA type only) Attachment, 28 x 30 mm 07946-1870100 6001 radial ball bearing installation (WA type only) Date of lssue: December, 2002 © Honda Motor Co., Ltd.
  • Page 79 GX25 Date of lssue: December, 2002 © Honda Motor Co., Ltd.

  • Page 80: Spark Arrester (If Equipped)

    If necessary, clean with a wire brush as SCREEN shown. 4) Replace the spark arrester if there are any breaks or tears. 5) Install the spark arrester and top cover in the reverse order of removal. Date of lssue: December, 2002 © Honda Motor Co., Ltd.
  • Page 81 GX25 Date of lssue: December, 2002 © Honda Motor Co., Ltd.

  • Page 82: Air Cleaner/Carburetor

    Before installation, clean inside the case with compressed air. OIL TRAP PLATE AIR FILTER CLEANING: P. 3-3 of the base shop manual. COLLAR (2) 5 mm FLANGE NUT (2) AIR CLEANER COVER Date of lssue: December, 2002 © Honda Motor Co., Ltd.
  • Page 83 5 x 9 mm SOCKET BOLT 6 mm SELF-LOCKING NUT CORD CLIP CONTROL LEVER WASHER CONTROL BASE 5 x 16 mm SOCKET ENGINE STOP SWITCH BOLT REMOVAL/ INSTALLATION: P. 4-3 Date of lssue: December, 2002 © Honda Motor Co., Ltd.

  • Page 84: Engine Stop Switch

    Attach the tester leads to the black wire and the control base, and check for continuity. Switch OFF position: There should be continuity. Switch ON position: There should be no continuity. Date of lssue: December, 2002 © Honda Motor Co., Ltd.
  • Page 85 14.8 x 2.4 mm CARBURETOR ASSEMBLY O-RING DISASSEMBLY/REASSEMBLY: P. 4-3 Do not reuse. and P. 4-4 of the base shop manual. ADJUSTMENT: P. 3-5 and P. 4-5 of the base shop manual. Date of lssue: December, 2002 © Honda Motor Co., Ltd.

  • Page 86: Recoil Starter/Fuel Tank

    Low-perm horizontal type: 0.53 l (0.14 US gal, 0.12 Imp gal) installation and replace if necessary. Low-perm vertical type: 0.54 l (0.14 US gal, 0.12 Imp gal) Verify that the tube is not kinked in the tank. See Note 1 Revised: February 2010 (PSV61Z0H00E2-A) ©American Honda Motor Co., Inc...
  • Page 87 GX25 Date of lssue: December, 2002 © Honda Motor Co., Ltd.

  • Page 88: Top Cover/Muffler

    REASSEMBLY: Install after removing the carbon from the screen with a wire brush. 3 x 6 mm SELF- TAPPING SCREW [Type equipped with spark arrester] Date of lssue: December, 2002 © Honda Motor Co., Ltd.
  • Page 89 GX25 Date of lssue: December, 2002 © Honda Motor Co., Ltd.

  • Page 90: Starter Pulley/Ignition Coil/ Clutch Shoe/Flywheel

    6.4 N . m (0.7 kgf . m, 4.6 lbf . ft) 7 mm FLANGE NUT 14.7 N . m (1.49 kgf . m, 10.7 lbf . ft) 6 x 22 (2) FAN COVER Date of lssue: December, 2002 © Honda Motor Co., Ltd.
  • Page 91 2) Press the radial ball bearing in the fan cover using the special tools. TOOLS: ATTACHMENT, Driver 07749-0010000 28 x 30 mm Attachment, 28 x 30 mm 07946-1870100 07946-1870100 Pilot, 12 mm 07746-0040200 PILOT, 12 mm 07746-0040200 Date of lssue: December, 2002 © Honda Motor Co., Ltd.
  • Page 92 SPECIFICATIONS..... . . 1-1 TOP COVER/MUFFLER (TA2 TYPE ONLY) . . . 6-1 THROTTLE LEVER (WA TYPE ONLY) ..3-1 Date of lssue: December, 2002 10-1 © Honda Motor Co., Ltd.
  • Page 93 GX25 Date of lssue: December, 2002 © Honda Motor Co., Ltd.

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