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BR250F
Yamaha BR250F User Manual
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CHAPTER
2.
ENGINE
2-1.
ENGINE
REMOVAL
2-1
2-2.
DISASSEMBLY
AND
INSPECTION
2-2
A.
Recoil
Starter
2-2
B.
Flywheel
Magneto
2-3
C.
Oil
Pump
2-4
D.
Top
End
2-6
E.
Bottom
End
2-10
2-3.
ASSEMBLY
AND
ADJUSTMENT
2-12
A.
Bottom
End
2-12
B.
Top
End
2-13
C.
Flywheel
Magneto
2-14
D.
Recoil
Starter
2-15
E.
Oil
Pump
Gear
Case
2-17
2-4.
ENGINE
INSTALLATION
2-19
10
12
Table of Contents
Chapter 1. General
4
Table of Contents
4
External View
5
Machine Identification
6
Pre-Season Preparation
6
Storage
6
Terms
6
Maintenance
7
Periodic Maintenance
7
Lubrication Intervals
8
Sealing the Carburetor
9
High Altitude Tuning
9
Special Tools
10
Chapter 2. Engine
11
Engine Removal
12
Disassembly and Inspection
13
Recoil Starter
13
Flywheel Magneto
14
Oil Pump
15
Top End
17
Bottom End
21
Assembly and Adjustment
23
Bottom End
23
Top End
24
Flywheel Magneto
25
Recoil Starter
26
Oil Pump Gear Case
28
Engine Installation
30
Chapter 3. Carburetion
31
Carburetor
32
Removal
32
Disassembly
33
Inspection
33
Assembly
33
Installation
34
Tuning and Adjustment
34
Carburetor Tuning Data
34
Starter Cable Adjustment
35
Throttle Cable Adjustment
36
Oil Pump Cable Adjustment
36
Low Speed Tuning
37
MID-Range and High Speed Tuning
37
Troubleshooting
38
Intake
40
Chapter 4. Power Train
41
Clutch Tuning
42
Clutch Setting Data
43
Changing Clutch Engagement and Shift RPM
44
Sheave Alignment
42
V-Belt
44
Removal
44
Inspection
44
Primary Sheave
45
Removal
45
Disassembly
46
Inspection
46
Assembly
47
Secondary Sheave
49
Removal
49
Inspection
50
Assembly
50
Chain Case
51
Disassembly
52
Inspection
52
Gearing
53
Assembly
53
Brake
55
Disassembly
55
Inspection
56
Assembly
56
Brake Adjustment
56
Slide Rail Suspension
57
Removal
57
Inspection
58
Installation
59
Drive
60
Removal
60
Inspection
61
Assembly
61
Track Adjustment
61
Chapter 6. Electrical
69
Circuit Diagram
70
IGNITION System
70
Troubleshooting
70
Ignition Timing
71
Spark Gap Test
72
Ignition Coil
73
Spark Plug
73
C.D.1. Unit
74
Pulser and Charge Coil
74
Circuit Diagram
75
Headlight Beam
75
Lighting System
75
Lighting Coil
76
Voltage Regulator
76
Chapter 7. Appendix
78
Specifications
79
Tightening Torque
82
Conversion Tables
84
Exploded Diagrams
85
Recoil Starter
85
Flywheel Magneto
86
Oil Pump
87
Oil Pump Drive Gear
88
Top End
89
Bottom End
90
Carburetor
91
Intake
92
Secondary Sheave
94
Chain Case
95
Brake
96
Slide Rail
97
Suspension Wheels
98
Drive Axle
99
Steering
100
Ski
101
Ski Shock
102
Oil Tank
103
Fuel Tank
104
Electrical Components
105
Control Cables
107
Bends, Cracks, and Wear
115
Abnormal Noise
115
Loose Connection and Breaks in the Fuel and Pulse Pipes
115
Loose Connection and Breaks in the Oil Pipes
115
Loose Connection and Breaks in the Oil Delivery Pipe
115
Bends and Cracks
116
Ski Adjustment
116
Ski Runner Wear
116
Breaks in Fuel Tank
116
Fuel Filter Loose Connection and Breaks in Fuel Pipe
116
Table of Contents
159
General Information
160
Machine Identification
160
Frame Serial Number
160
Engine Serial Number
160
Chassis
161
Fuel Sub Tank
161
Job Instruction Chart
162
Electrical
163
Circuit Diagram
163
Electrical Component
165
Ignition System
166
Circuit Diagram
166
Troubleshooting
167
Spark Plug Cap
168
Ignition Coil
168
Source Coil
168
Spark Plug
169
Throtile Override System (T.o.r.s.)
169
Handlebar Switch (Right)
170
Carburetor Switch
170
Main Switch
171
Lighting System
172
Circuit Diagram
172
Troubleshooting
173
Bulb (S)
174
Headlight Beam Switch
174
Specifications
175
General Specifications
175
Maintenance Specifications
177
Engine
177
Power Train
181
Chassis
185
Electrical
186
General Torque Specifications
187
Cable Routing
188
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Yamaha BR250F Specifications
General
Brand
Yamaha
Model
BR250F
Category
Offroad Vehicle
Language
English
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