Yamaha YZ250F(V) Owner's Service Manual page 302

REMOVAL POINTS
Camshaft
1. Remove:
2. Align:
3. Remove:
2
4. Remove:
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 - 24
CAMSHAFTS
• Timing mark accessing screw 1
• Crankshaft end accessing screw 2
• T.D.C. mark
With align mark.
Checking steps:
• Turn the crankshaft counterclockwise with
a wrench.
• Align the T.D.C. mark a on the rotor with
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.
• Timing chain tensioner cap bolt 1
• Timing chain tensioner 2
• Gasket
• Bolt (camshaft cap) 1
• Camshaft cap 2
• Clip
CAUTION:
ENG