Honda 2003 NPS50 Ruckus Service Manual page 134

CYLINDER HEAD/VALVES
Remove the two bolts and outer magnet while hold-
ing the crankshaft.
Remove the cam sprocket from the camshaft and
cam chain from the cam sprocket.
Attach a piece of wire to the cam chain to prevent it
from falling into the crankcase.
Loosen the outside cylinder head bolts.
Remove the bolts and stopper plate.
Remove the rocker arm shafts, D-ring, rocker arms
and springs.
Refer to page 9-13 for cam chain tensioner and cam
chain guide removal.
9-8