Sym RS-50 Service Manual page 51

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
Cylinder Head Installation
Tightening bolts
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: 1.0kgf-m
Install spark plug
Tighten torque: 1.4kgf-m
Replace the exhaust pipe gasket with new one
Tightening bolt x 2
and then install exhaust pipe.
Tighten exhaust pipe connection nut.
Tighten torque: 1.2kgf-m
Tighten exhaust muffler mounting bolt.
Tighten torque: 3.3kgf-m
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 3
5-4