Cylinder Head Installation - Sym Wolf SB 250 Ni Service Manual

7. Cylinder Head / Valve
Install camshaft into cylinder head. Install
valve rocker arm, rocker arm shaft and rocker
arm shaft holding plate.

Cylinder head installation

Clean up foreign materials on the matching
surfaces of cylinder and cylinder head.
Install cam chain guide.
Install new dowel pins and gasket on the
cylinder.
Caution
Do not damage matching surfaces.
●
Prevent foreign material from falling into
●
the crankcase.
Install cylinder head.
Tighten the 4 cylinder head nuts, then the 2
bolts on right side of cylinder head.
Torque value:
Cylinder head nut
Bolt on right side of cylinder head
Caution
Lubricate with engine oil and tighten the
●
cylinder head nuts in diagonally opposite
sequence.
Do not exceed the specified torque value
●
to prevent damaged cylinder head,
abnormal noise, leakage or poor engine
performance.
Rotate the crankshaft counterclockwise and
align the "T" mark on the flywheel with the
index mark on the left crankcase cover. (The
piston is on the top dead center.)
Install the cam chain sprocket and sprocket,
align the timing mark with the index mark on
the cylinder head.
Tighten sprocket bolt. (bolt×2)
Torque value: 1.0~1.4kgf-m
Install spark plug.
Torque value:1.0~1.2kgf-m
Caution
Make sure aligning the timing mark.
●
7-14
3.6~4.0kgf-m
1.0~1.4kgf-m
bolt×1
Dowel pin
nut×4
Timing
mark
Holding
plate
Cam chain guide
gasket
bolt×2