Cylinder And Cylinder Head Assembly - Yamaha YFM250XL(C) Service Manual

ENGINE ASSEMBLY AND ADJUSTMENT

CYLINDER AND CYLINDER HEAD ASSEMBLY

1 Spark plug
2 Tappet cover (intake)
3 O-ring
4 Tappet cover (exhaust)
5 Cylinder head
6 Bearing retainer
7 Lock washer
CYLINDER HEAD WARP
A LIMIT:
0.10 mm (0.004 in)
B SPARK PLUG:
TYPE/MANUFACTURER:
C
DR7EA/NGK
SPARK PLUG GAP:
D 0.6 ~ 0.7 mm
(0.024 ~ 0.028 in)
VALVE CLEARANCE
(COLD):
INTAKE: 0.05 ~ 0.09 mm
E
(0.002 ~ 0.004 in)
EXHAUST:0.11 ~ 0.15 mm
(0.004 ~ 0.006 in)
8 Cam sprocket cover
9 Oil seal
0 Cylinder
4 - 65
ENG
4