Service manual
Table Of Contents
- Inroduction
- Yamaha Motor Corporation, USA YZ/WR Motorcycle Limited Warranty
- How to use this Manual
- Index
- Contents
- Chapter 1 General Information
- Chapter 2 Specifications
- Chapter 3 Regular Inspection and Adjustments
- Chapter 4 Engine
- Seat, Fuel Tank and Side Covers
- Exhaust Pipe and Silencer
- Radiator
- Carburetor and Reed Valve
- Cylinder Head, Cylinder and Piston
- Clutch and Primary Driven Gear
- Kick Axle, Shift Shaft and Primary Drive Gear
- YPVS Govenor
- Water Pump
- CDI Magneto
- Engine Removal
- Crankcase and Crankshaft
- Transmission, Shift Cam and Shift Fork
- Chapter 5 Chassis
- Chapter 6 Electrical
- Chapter 7 Tuning
4-64
ENG
CRANKCASE AND CRANKSHAFT
Standard <Limit>
Runout 0.03 mm 0.05 mm
limit: (0.0012 in) (0.0020 in)
Small end 0.8~1.0 mm 2.0 mm
free play: (0.031~0.039 in) (0.08 in)
Side 0.06~0.64 mm
—
clearance: (0.002~0.025 in)
Crank 55.90~55.95 mm
—
width: (2.201~2.203 in)
2. Inspect:
9
Bearings 1
Rotate inner race with a finger.
Rough spot/Seizure → Replace.
3. Inspect:
9
Oil seal 1
Damage → Replace.
EC4N4202
Crankshaft
1. Measure:
9
Runout limit a
9
Small end free play limit b
9
Connecting rod big end side clearance c
9
Crank width d
Out of specification → Replace.
Use the dial gauge and a thickness gauge.
EC4N5000
ASSEMBLY AND INSTALLATION
EC4N5300
Crankshaft bearing
1. Install:
9
Bearing 1
To crankcase (left and right).
NOTE:
Install the bearing by pressing its outer race
parallel.
Dial gauge:
YU-3097/90890-01252
1C3-28199-10 153 04.5.17, 9:24:21 PM