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to the cylinder head , in the connecting hole
of the cylinder body and fasten it;
Notice:
1. The cylinder head gasket must be replaced
with a new one;
2. Tightening torque of bolts A and B:
55
～
60N.m.
3. Install the M6
×
25 bolts (7) to the cylinder block
and box
Install the bolts (4) of M6
×
40
into the connecting hole of the cylinder head and
cylinder block and tighten.
Tightening torque: 11
～
13N.m.
4. Install the timing driven sprocket and
timing chain on the camshaft, and then check
whether the engine is in the timing position. If it
is not in the timing position, you need to
re-adjust the timing position of the engine.
NC450 engine timing adjustment method:
(1) Remove the large viewing hole cover of
the left front cover and the bolts of the NC250
rocker shaft positioning plate;
(2) Rotate the NC250 magneto lock nut with a
special tool, and at the same time pass the
bolt hole of the rocker shaft positioning plate
on the left front cover
Observe whether the timing mark "one" on
the magneto rotor is aligned with the timing
mark on the left front cover;
(3) After the above timing marks are aligned,
pay attention to observe whether the timing
mark on the timing driven sprocket is on the
same line as the cylinder head timing mark;
The engine is in the correct timing position
only if (2)(3) are satisfied at the same time.
After adjusting the timing position,
assemble the large sight hole cover and the bolts
Timing driven sprocket
timing mark
NC450cylinder
head
timing mark
