Valve Clearance Adjustment - Honda 2003 NPS50 Ruckus Service Manual

NOTE:
ADJUSTMENT
•
Move the rocker arm to the spring side and remove
•
the shim.
•
Do nat allow the shims to fall into the crankcase.
Mark a l l shims to ensure correct reassembly in
their original locations.
The shims can be easily removed with tweezers
or a magnet.
Clean the valve shim contact area with compressed
air.
NOTE:
•
Measure the shim thickness and record it.
Sixty-nine different shim thicknesses are avail­
able in increments of 0.025 mm (from 1 .200 m m
t o 2.900 m m ) .
Calculate t h e new shim thickness using t h e equa­
tion below.
A = (8 - 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 mea­
suring the s h i m with a micrometer.
Reface the valve seat if carbon deposits result in
a calculated d i mension of over 2.900 mm.
Install the newly selected shim on the spring
retainer.
Rotate the camshaft by rotating the drive pulley
(crankshaft) counterclockwise several times.
Recheck the valve clearance.
Install the following:
- Cylinder head cover (page 9-22)
- Belt case cover (page 1 0-6)
- Radiator cover (page 7-8)
MAINTENANCE
SHIM
e e e e
1.80 mm 1.825 m m 1.85 m m
1 .875 m m
4-9