IN SPEC TIO N A N D R EPA IR
N O TE:
After installing valve guide:
*U se the 5.5 m m Valve G uide R eam er (YM -
01196)
to obtain proper valve guide/
valve stem clearance,
the valve seat.
C irclip
Valve guide
Valve Seat
1. Inspect
*V alve seat
W ear/Pitting/Valve replacem ent
R esurface seat at 45° angle.
C lean valve seat if pitted or w orn using a 45°
Valve Seat C utter (YM -91043)
, W hen tw ist-
ing cutter, keep an even dow nw ard pressure to
prevent chatter m arks.
C ut sections as follow s
Section
C utter
A
30°
1
B
45°
C
60°
2. M easure:
• Valve seat w idth
3. Apply:
• M echanics bluing dye (D ykem )
To valve and seat.
*Fine grinding com pound (sm all am ount)
G round surface of valve face.
4. Position:
Into cylinderhead.
Spin it rapidly back and forth, then lift
valve and clean off all grinding com pound.
5. Inspect:
seat surface
W herever valve seat and valve face m ade
contact, bluing w ill have been rem oved.
3-22
Summary of Contents for VMX12H
Page 1: ...VMXl2N NC K KC...
Page 2: ...LIT 11616 10 12...
Page 22: ...VAMAHA MOTOR CO LTD PRINTEDI N U S A...
Page 23: ...E LIT 11616 08 77...
Page 44: ...CIRCUIT DIAGRAM ELECTRICAL CIRCUIT DIAGRAM I I 1...
Page 48: ...VAMAHA MOTOR CO LTD PRINTED IN U S A...
Page 49: ...I LIT I1616 06 08...
Page 56: ...TO IWATA JAPAN PRINTED IN U S A...
Page 57: ...LIT 1...
Page 64: ...IWATA JAPAN PRINTED IN U S A...
Page 65: ...I Serr ice L 1616 04 67...
Page 206: ...ENGINE ASSEMBLY AND ADJUSTMENT MEMO 3 82...
Page 304: ...CIRCUIT DIAGRAM I I ELECTRICAL CIRCUIT DIAGRAM w w 7 1...
Page 308: ...ELECTRIC STARTING SYSTEM I I ELECTRIC STARTING SYSTEM CIRCUIT DIAGRAM 7 5...
Page 320: ...CHARGING SYSTEM CHARGING SYSTEM CIRCUIT DIAGRAM 7 17...
Page 325: ...MEMO 7 22...
Page 326: ...IGNITION SYSTEM IGNITION SYSTEM CIRCUIT DIAGRAM 7 23...
Page 334: ...LIGHTING SYSTEM LIGHTING SYSTEM CIRCUIT DIAGRAM 7 31...
Page 339: ...MEMO 7 36...
Page 340: ...SIGNAL SYSTEM SIGNAL SYSTEM CIRCUIT DIAGRAM 7 37...
Page 348: ...COOLING SYSTEM COOLING SYSTEM CIRCUIT DIAGRAM 7 45...
Page 354: ...FUEL PUMP SYSTEM FUEL PUMP SYSTEM CIRCUIT DIAGRAM 7 51...
Page 362: ...V BO O ST SYSTEM V BO O ST SYSTEM CI RCUI T DI AG RAM...
Page 390: ...LUBRICATION DIAGRAMS LUBRICATION AGRAMS LUBRICATION DIAGRAM 8 20...
Page 391: ...LUBRICATION DIAGRAMS LUBRICATION DIAGRAM 2 8 21...
Page 392: ...LUBRICATION AGRAMS LUBRICATION DIAGRAM 8 22...
Page 393: ...LUBRICATION DIAGRAMS LUBRICATION DIAGRAM 4...
Page 401: ...CABLE ROUTING CANISTER PIPE ROUTING To carburetor To fuel tank TO Canister...
Page 403: ...m...