Yamaha YZ250F Fahrer- Und Wartungshandbuch Seite 298

REMOVAL POINTS
Camshaft
2
1
NOTE:
Remove the bolts (camshaft cap) in a criss-
cross pattern, working from the outside in.
The bolts (camshaft cap) must be removed
evenly to prevent damage to the cylinder
head, camshafts or camshaft caps.
4 - 23
CAMSHAFTS
1. Remove:
Timing mark accessing screw 1
G
Crankshaft end accessing screw 2
G
2. Align:
T.D.C. mark
G
With align mark.
Checking steps:
Turn the crankshaft counterclockwise with
G
a wrench.
Align the T.D.C. mark a on the rotor with
G
the align mark b on the crankcase cover
when piston is at T.D.C. on compression
stroke.
NOTE:
In order to be sure that the piston is at Top
Dead Center, the punch mark c on the
exhaust camshaft and the punch mark d on
the intake camshaft must align with the cyl-
inder head surface, as shown in the illustra-
tion.
3. Remove:
Timing chain tensioner cap bolt 1
G
Timing chain tensioner 2
G
Gasket
G
4. Remove:
Bolt (camshaft cap) 1
G
Camshaft cap 2
G
Clip
G
CAUTION:
ENG