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 NS125DLX
Page 1: ...SERVICE MANUAL...
Page 4: ...Service Information 1 2 Identification Numbers Frame serial number Engine serial number...
Page 22: ...MEMO...
Page 43: ...MEMO...
Page 44: ...Fuel System 5 0 Fuel tank Fuel strainer Fuel pump Carburetor...
Page 54: ...MEMO...
Page 58: ...L Crank Case Cover Kick Starter Continuously Variable Transmission 7 0 L crank case cover...
Page 76: ...Generator Starter Clutch 8 0...
Page 107: ...MEMO...
Page 108: ...Transmission Crankshaft Crank Case 11 0 R Crank Case Crankshaft L Crank Case...
Page 154: ...MEMO...
Page 168: ...MEMO...
Page 172: ...MEMO...
Page 180: ...MEMO...
Page 182: ...MEMO...
Page 190: ...2001 4 PRINTED 2001 4 PUBLICATION SERVICE MANUAL NO COPY...