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
4-26
ENG
CYLINDER HEAD, CYLINDER AND PISTON
2. Install:
9
Spring 1
9
Link lever 2
9
Collar 3
9
Valve shaft 4
9
Valve holder 5
9
Bolt (link lever) 6
NOTE:
9
Install the spring to the link lever, and then to
the cylinder.
9
Install the spring with its stopper portion a fac-
ing inward.
9
Apply the lithium soap base grease on the oil
seal lip.
3. Install:
9
Thrust plate 1
9
Screw (thrust plate) 2
4. Check:
9
Power valve smooth movement
Unsmooth movement → Repair or replace.
5. Install:
9
Gasket (power valve cover) 1
9
Power valve cover 2
9
Screw (power valve cover) 3
9
YPVS breather hose 4
NOTE:
9
Install the power valve cover so that the arrow
mark a faces upward.
9
Install the clamp of the YPVS breather hose
with its opening portion b facing backward.
4 Nm (0.4 m•kg, 2.9 ft•lb)
4 Nm (0.4 m•kg, 2.9 ft•lb)
5 Nm (0.5 m•kg, 3.6 ft•lb)
1C3-28199-10 115 04.5.17, 9:22:24 PM