Yamaha YP400T Service Manual page 92

ADJUSTING THE VALVE CLEARANCE
d
c
1
NOTE:
_
• TDC on the compression stroke can be
found when the camshaft lobes are turned
away from each other.
• In order to be sure that the piston is at TDC,
the punch marks c on the intake camshaft
sprocket and the punch mark d on the
exhaust camshaft sprocket must align with
the cylinder head mating surface as shown in
the illustration.
c. Measure the valve clearance with a thick-
ness gauge 1.
NOTE:
_
If the valve clearance is incorrect, record the
measured reading.
L LLL L LLL L L LLL L
5. Remove:
• intake camshaft
• exhaust camshaft
NOTE:
_
• Refer to "CAMSHAFTS" in chapter 5.
• When removing the timing chain and cam-
shafts, fasten a wire to the timing chain to
retrieve it if it falls into the crankcase.
6. Adjust:
• valve clearance
M MMM M MMM M M MMM M
a. Remove the valve lifter 1 and the valve pad
2 with the valve lapper 3.
Valve lapper
90890-04101
NOTE:
_
• Cover the timing chain opening with a rag to
prevent the valve pad from falling into the
crankcase.
• Make a note of the position of each valve
lifter 1 and valve pad 2 so that they can be
installed in the correct place.
3 - 12
CHK
ADJ
L LLL L L LLL L L LLL L LLL
M MMM M M MMM M M MMM M MMM