Service Information; General Instructions; Specifications - KYMCO AHG5 Service Manual

6. CYLINDER HEAD/ VALVE

2. SERVICE INFORMATION

2.1. GENERAL INSTRUCTIONS


The cylinder head can be serviced with the engine installed in the frame. Coolant in the
radiator and water jacket must be drained first.

When assembling, apply molybdenum disulfide grease or engine oil to the valve guide
movable parts and valve arm sliding surfaces for initial lubrication.

The valve rocker arms are lubricated by engine oil through the cylinder head engine oil
passages. Clean and unclog the oil passages before assembling the cylinder head.

After disassembly, clean the removed parts and dry them with compressed air before
inspection.
 After removal, mark and arrange the removed parts in order. When assembling, install
them in the reverse order of removal.

2.2. SPECIFICATIONS

Valve clearance (cold)
Cylinder head compression pressure
Camshaft cam height
Valve rocker arm I.D.
Valve rocker arm shaft O.D.
Valve seat width
Valve stem O.D.
Valve guide I.D.
Valve stem-to-guide clearance
Item
Standard
IN 0.1
EX 0.1
12±2 kgf-cm2
IN 34.2987
EX 34.1721
IN 10.0~10.015
EX 10.0~10.015
IN 9.972~9.987
EX 9.972~9.987
IN 1.2
EX 1.2
IN 4.975~4.990
EX 4.955~4.970
IN 5.00~5.012
EX 5.00~5.012
IN 0.010~0.037
EX 0.030~0.057
6-3
DT X360
Unit: mm
Service Limit



33.89
33.77
10.10
10.10
9.91
9.91
2.0
2.0
4.90
4.90
5.30
5.30
0.08
0.10