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GX25U
Honda GX25U Shop Manual
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2
Table of Contents
Contents
2
Specifications
3
Dimensional Drawnings
4
Wiring Diagram
4
Service Information
5
Serial Number Location
5
Maintenance Standards
6
Torque Values
7
Special Tools
8
Troubleshooting
9
General Symptom and Possible Causes
9
Engine Troubleshooting
11
Hard Starting
11
Cylinder Compression Check
11
Poor Performance at Low Speed
12
Poor Performance at High Speed
13
Ignition System
14
Spark Test
14
Probable Causes of Major Carburetor Problems
15
Maintenance Schedule
16
Engine Oil
17
Air Cleaner
18
Spark Plug
18
Valve Clearance
19
Carburetor
20
Fuel Tank/Fuel Filter
20
Spark Arrester
21
Air Cleaner Removal/Installation
22
Carburetor Removal/Installation
23
Carburetor Disassembly/Reassembly
24
Carburetor Adjustment
26
Metering Lever
26
Recoil Starter/Fuel Tank
27
Recoil Tank Reassembly
28
Fuel Tank Removal/Installation
30
Top Cover/Muffler Removal/Installation
31
Starter Pulley/Ignition Coil/Clutch Shoe/Flywheel
32
Recoil Starter Pulley
32
Ignition Coil/Clutch Shoe/Flywheel Disassembly and Reassembly
33
Clutch Assembly
34
Ignition Coil Inspection
35
Ignition Coil Air Gap Adjustment
36
Cam Pulley/Cylinder Head Cover Disassembly/Reassembly
37
Cam Pulley Removal
38
Cylinder Head Inner Cover
39
Lower Crankcase Disassembly/Reassembly
40
Lower Crankcase Removal/Installation
41
Oil Outlet Valve Disassembly
41
Shroud Reassembly
42
Crankshaft/Piston/Cylinder Block/Valves
43
Piston Pin Disassembly/Reassembly
44
Crankshaft Inspection/Reassembly
46
Cylinder Block/Valves Disassembly/Assembly
47
Cylinder Sleeve I.D.
48
Piston Ring End Gap
49
Cam Height
50
Cam Pulley Shaft O.D./I.D
50
Valve Spring Free Length
50
Valve Face/Stem O.D.
51
Valve Guide I.D.
51
Valve Stem-To-Guide Clearance
51
Index
52
Outline of Changes
56
Dimensions and Weights
60
Dimensional Drawings WA Type
61
Dimensional Drawings TA2 Type
62
Throttle Lever (WA Type Only)
64
Air Cleaner (TA 2 Type Only) Removal/Installation
65
Control Assembly (WA Type Only) Removal/Installation
66
Engine Stop Switch
67
Throttle Rod Installation
67
Carburetor (WA Type Only) Removal/Installation
68
Fuel Tank (TA2 Type Only) Removal and Installation
69
Top Cover/Muffler (TA2 Type Only) Removal/Installation
70
Fan Cover/Engine PTO Shaft/Flywheel (WA Type Only)
71
Engine PTO Shaft
72
6001 Radial Ball Bearing
72
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Owner's Manual
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Honda GX25U Specifications
General
Fuel Type
Unleaded Gasoline
Oil Capacity
0.1 L
Starting System
Recoil Starter
Ignition System
Transistorized magneto ignition
Fuel System
Carburetor
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