Yamaha TT-R125(R), Owner'S Service Manual

Page: 240 / 510

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)