Yamaha TTR125LM, Owner'S Service Manual

Page: 216 / 468

4 - 16
ENG
CYLINDER HEAD
Warpage limit:
0.03 mm (0.0012 in)
●
If the warpage is out of specification,
resurface the cylinder head.
●
Place # 400 ~ 600 grit wet sandpaper on
the surface plate, and re-surface the head
using a figure-eight sanding pattern.
NOTE:
Rotate the cylinder head several times to
avoid removing too much material from one
side.
ASSEMBLY AND INSTALLATION
Cylinder head
1. Install:
●
Dowel pin 1
●
Gasket 2
New
2. Install:
●
Cylinder head
●
Copper washer
●
Bolt (cylinder head)
NOTE:
●
Apply Quick gasket
®
(Yamaha bond No.
1215) on end of the cylinder head bolts (M6),
as shown.
●
Apply the engine oil on the contact surfaces of
the bolts (cylinder head) and copper washers.
●
Follow the numerical order shown in the illus-
tration. Tighten the bolts in two stages.
Quick gasket
®
:
ACC-QUICK-GS-KT
Yamaha bond No. 1215:
90890-85505
T
R
.
.
M8 22 Nm (2.2 m · kg, 16 ft · lb)
M6 10 Nm (1.0 m · kg, 7.2 ft · lb)