Cylinder Head/Valve
●
Remove the valve, and check the status of the seat
contact, with a light coating of prussian blue applied
to the valve face.
●
If the valve seat is damage, make necessary repair.
If the valve is tilted, check the clearance between
the valve guide and stem. Replace the valve guide
if the clearance is abnormal.
NOTE
●
Measure the valve seat width.
Standard value: 0.8-1.0mm(0.031-0.039in)
Service limit: 1.4mm(0.055in)
Valve Seat Cutter
●
Repair the damaged valve seat by using valve
seat cutters and grinders.
NOTE
Valve Seat Repair
●
If the seat surface is rough or otherwise damaged,
use a 45
°
cutter to grind the surface.
NOTE
●
Correct the plane slightly using a 37 cutter.
9-9
Valve cannot be corrected. If the valve face is
seized, excessively worn, and if the contact is
poor, change the valve.
Follow the seat cutter user’s manual.
Grind the seat surface after the valve guide is
replaced.
Valve seat
Roughness
45
○
37
○
37
○
55
○
Summary of Contents for NS125III - SERVICE
Page 2: ......
Page 3: ......
Page 5: ......
Page 31: ...MEMO...
Page 52: ...MEMO...
Page 53: ...Fuel System 5 0 Fuel tank Fuel strainer Fuel pump Carburetor...
Page 63: ...MEMO...
Page 67: ...L Crank Case Cover Kick Starter Continuously Variable Transmission 7 0 L crank case cover...
Page 85: ...Generator Starter Clutch 8 0...
Page 116: ...MEMO...
Page 117: ...Transmission Crankshaft Crank Case 11 0 R Crank Case Crankshaft L Crank Case...
Page 153: ...MEMO...
Page 177: ...MEMO...
Page 191: ...MEMO...
Page 192: ...MEMO...
Page 193: ...MEMO...
Page 194: ...Wiring Diagram 19 1 19 Wiring Diagram 19...
Page 202: ...MEMO...
Page 203: ...2002 11 PRINTED 1999 11 PUBLICATION SERVICE MANUAL NO COPY...