HRC NSF250R 2012, Owner'S Manual & Parts List

Page: 47 / 300

3-7
Service and Maintenance
(1) VALVE LIFTER
(1) SHIM
Clean the valve shim contact area in the valve lifter
with compressed air.
Measure the shim thickness and record it.
(1)
(1)
Sixty-five different thickness shims are available
from the thinnest 1.200 mm thickness shim to the
thickest 2.800 mm shim in intervals of 0.025 mm.
Calculate the new shim thickness using the equation
below.
A = (B – C) + D
A: New shim thickness
B: Recorded valve clearance
C: Specified valve clearance
D: Old shim thickness
• Make sure of the correct shim thickness by meas-
uring the shim by micrometer.
• Reface the valve seat if carbon deposit result in a
calculated dimension of over 2.800 mm.
(1) SHIM
(2) VALVE LIFTER
Install the newly selected shim on the valve retain-
er.
Apply molybdenum disulfide oil to the valve lifters
and install them into the valve lifter bores.
• Install the shims and valve lifters in their original
locations.
Install the camshaft (page 4-38).
Rotate the camshafts by rotating the crankshaft
clockwise several times.
Recheck the valve clearance.
Remove the cam chain tensioner stopper tool.
Install the cam chain tensioner lifter sealing bolt
with a new sealing washer, then tighten the bolt.
(2)
(1)