Yamaha YP250 Service Manual page 106

CYLINDER HEAD
5. Install:
S Timing chain tensioner
*****************************************************
Installation steps:
D Remove the tensioner cap bolt 1 and
springs 2 .
D Release the timing chain tensioner one-way
cam 3 and push the tensioner rod 4 all the
way in.
D Install the tensioner with a new gasket 5
onto the cylinder.
D Install the springs 2 and cap bolt 1 .
D Tighten the bolt (with gasket) to the specified
torque.
Bolt (chain tensioner)
Cap bolt (timing chain tensioner)
8 Nm (0.8 mSkg)
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6. Tighten:
S Bolt (cam sprocket)
7. Check:
S Valve timing
Out of alignment ! Adjust.
Refer to the above steps 3 X 5.
8. Check:
S Valve clearance
Out of specification ! Adjust.
Refer to the "VALVE CLEARANCE AD-
JUSTMENT" section in CHAPTER 3.
4-10
ENG
10 Nm (1.0 mSkg)
60 Nm (6.0 mSkg)