ZHEJIANG KAYO MOTOR CO., LTD.
2. After coating the intake and exhaust valve rods with lubricating oil, install the valve guides, install the inner
and outer springs of the valve, the valve spring seat and the valve lock clip.
3. Depress the valve spring with a valve puller, and then install the valve lock clip into the valve spring seat.
Note: In order to prevent permanent deformation of the valve spring, do not over-compress the spring so
that it can be installed in the valve lock clip.
4. Check whether the valve lock clamp assembly is in place.
5. Check the air tightness of the assembled cylinder head. If the cylinder head assembly does not leak, proceed to
the next step.
6. Insert the camshaft into the camshaft hole of the cylinder head and assemble it in place, and then turn the
camshaft to a downward direction. The arc surface of the rocker arm is placed on the base circle of the
camshaft to install the rocker arm, and the threaded end of the rocker shaft passes outwards through the
cylinder head The rocker arm shaft hole is smoothly inserted into the limit plate and the rocker arm shaft hole.
Check that the rocker arm shaft is installed in place and cannot interfere with the AB bolt hole. Align the
gasket, the right cover of the cylinder head and the mounting screw hole and install it in place, and then
tighten the bolts.
7. Inject 3ml-5ml clean engine oil into the rocker arm oil hole, the junction of the two rocker arm R faces and the
camshaft.
Note
：
1. The threaded end of the rocker arm shaft is outward When installing the rocker arm shaft.
2. After installing the cylinder head, rotate the cam, and the cam rocker arm should rotate flexibly without
jamming.
3. Cylinder head right cover bolt tightening torque
：
10
～
14N·m
，
The large hole should be the same as the oil passage hole of the right cover of the cylinder head when
assembling
INSTALLING THE CYLINDER HEAD
The installation steps of the cylinder head are as follows:
1. Remove the old cylinder head gasket, install the new cylinder head gasket, and then install the positioning pin,
flange bushing and rectangular ring.
2. Pull the piston to the top dead center, and then install the timing driven sprocket onto the timing chain. The
timing sprocket O is engraved upward.
3. Install the cylinder head on the A and B bolts, then install the cylinder head gasket, and then install the
cylinder head cover. Put the iron and copper washers on the A and B bolts, and then fasten the 4 cylinder head
covers. The shape nut is installed on the A and B bolts and tightened.
Note
：
1.
Do not allow dust and scum to enter the cylinder;
2.
Tightening torque of A and B bolt nuts: 13
～
16N.m;
3. The copper washer is assembled on the B bolt at the oil passage.
4. Install the connecting bolts into the connecting holes of the cylinder head and cylinder body and tighten them.
Tightening torque: 8
～
14N•m.
5. Adjust the timing sprocket with an iron stick so that the O marking of the timing sprocket is aligned with the
timing mark notch of the cylinder head, and the magneto rotor timing line is aligned with the timing mark on
the left front cover, and the timing sprocket hole is aligned with the camshaft Align the threaded holes, install
the timing bolt GB/T5783 M5×12, and then tighten.
Timing adjustment method:
（
1
）
Remove the size and view hole cover on the left front cover.
（
2
）
Rotate the magneto rotor so that the “one” line of the rotor timing is aligned with the timing mark on
the left front cover.
（
3
）
After the above timing mark is aligned, pay attention to observe that the o mark of the timing driven
sprocket is aligned with the timing mark on the cylinder head.
The engine is in the correct timing position only when (2) and (3) are satisfied at the same time.
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