Honda GL1800 Service Manual page 258

The timing marks on the cam sprocket must be
flush with the cylinder head surface and make sure
the rear end cam lobe is facing outward (TDC on
exhaust stroke).
If the rear end cam lobe is facing inward (TDC on
compression stroke), rotate the crankshaft counter-
clockwise 360° (one full turn) so the rear end cam
lobe faces out.
Loosen the camshaft holder bolts in a crisscross
Do not forcibly
pattern in several steps from the outside to inside
remove the dowel
to prevent damaging the camshaft holder and
pins from the cam-
camshaft.
shaft holder.
Remove the camshaft holder.
Remove the cam chain off the cam sprocket, being
careful not to damage the cylinder head and cam-
shaft and then remove the camshaft.
Rotate the crankshaft counterclockwise 360° (one
Be careful not to
full turn) and align the 1.2TF mark on the ignition
jam the removed
pulse generator rotor with the index mark in the
cam chain into the
front crankcase cover.
timing sprocket of
the crankshaft
Be sure that the timing marks on the cam sprocket
when rotating the
of other camshaft are flush with the cylinder head
crankshaft.
surface and that the rear end cam lobe is facing
outward (TDC on exhaust stroke).
CYLINDER HEAD/VALVE
Left camshaft shown:
TIMING MARKS
AMSHAFT HOLDER
AM HAIN
Right camshaft shown:
TIMING
MARKS
REAR END CAM
(No. 6-IN. LOBE)
AMSHAFT
REAR END CAM
(No. 5-IN. LOBE)
8-9