Cleaning Carbon In Combustion Chamber; Cylinder Head Inspection; Cylinder Head Installation - Sym JET 4 R 50 Series Service Manual

6. Cylinder Head/Cylinder/Piston
Remove engine shield.
Cylinder Head Removal
Remove spark plug.
Remove the 4 cylinder head bolts and then
remove the cylinder head.
Caution
Loosen the cylinder head bolts with diagonal
direction to avoid to damaging it.

Cleaning Carbon in Combustion Chamber

Clean carbon deposit in which built up in
combustion chamber with shown chisel.
Caution
Do not scratch to the interfaces of combustion
chamber and cylinder.

Cylinder Head Inspection

Use a straight edge and a feeler gauge to
measure the cylinder head for warp.

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: 1.6~2.0kgf-m
Install spark plug
Tighten torque: 1.1~1.7kgf-m
6-4
4 bolts
Chisel