Aeon 350cc, Service Manual

Page: 85 / 192

ENGINE
4-85
5. Position crankshaft at Top Dead Center (TDC) on
compression stroke.
CYLINDER HEAD AND CAMSHAFT
INSTALLATION
NOTE: Clean the gasket surfaces on the cylinder
head and cylinder. Remove all traces of old gasket
material.
1. Install the dowel pin(s) and a new cylinder head gasket.
2. Pull the cam chain through the cylinder head chain room
and secure with mechanic’s wire.
3. Place the cylinder head on the cylinder.
4. Install the cam according to the “Cam Shaft
Timing” procedure. Verify the cam chain is in place around
the crankshaft gear.
NOTE: Verify camshaft-timing procedure before
installing the rocker shaft assembly.
CAMSHAFT TIMING
Serious engine damage may result if the camshaft
is not properly timed to the crankshaft.
IMPORTANT CAMSHAFT TIMING NOTE
In order to time the camshaft to the crankshaft, the
piston must be precisely located at Top Dead
Center (TDC). This
can be accomplished using one of
two methods.
Install the cam chain over the crankshaft.
When the stator housing is removed, use Method 1 This
method uses the camshaft gear marks and the crankshaft
keyway to establish TDC. It is important to note that this
method can only be used when the stator housing is removed
and the crankshaft keyway is in view. The camshaft sprocket
alignment marks are parallel to the gasket surface, and
camshaft lobes are pointing down. The cam chain plate links
are not used to time the camshaft.
When the stator housing is installed, use Method 2
This method establishes accurate Top Dead Center
(TDC) by aligning the single mark on the flywheel with the
notch in the timing inspection hole (see Method 2).
The camshaft sprocket alignment marks are parallel to the
gasket surface, and camshaft lobes are pointing down. The
cam chain plate links are not used to time the camshaft.