Sym Jet 50 Service Manual page 53

This chapter Contents
5. CYLINDER HEAD/CYLINDER/PISTON
Cylinder Head Inspection
Use a straight edge and a feeler gauge to
measure the cylinder head for warp.
Service limit: 0.10 mm
Tightening bolts
Cylinder Head Installation
Replace the cylinder head gasket with new one,
and place the cylinder head onto cylinder.
Tighten the 4 bolts with diagonal direction and
by 2-3 sequences.
Tighten torque: 1.0 kgf-m
Install spark plug
Tighten torque: 1.4 kgf-m
Replace the exhaust pipe washer with new one
and then install exhaust pipe.
Tighten exhaust pipe connection nut.
Tighten torque: 1.2 kgf-m
Tighten exhaust pipe mounting bolt.
Tighten torque: 3.3 kgf-m
Tightening bolt x 2
Install the removed parts in the reverse order of
removal procedures.
Inspect following item after installation.
Compression pressure test.
Check for engine noise.
Muffle
Bolt x 2
5-4