KYMCO X-Town 300 ABS User Manual

6. CYLINDER HEAD/VALVES
6-2
X-Town300 ABS
SERVICE INFORMATION
GENERAL INSTRUCTIONS
 The cylinder head can be serviced with the engine installed in the frame. Coolant in the
radiator and water hoses must be drained.
 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 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.
SPECIFICATIONS
Unit: mm (in)
Item
Standard
Service Limit
Valve clearance (cold)
IN
0.1 mm (0.004 in)

EX
0.1 mm (0.004 in)

Cylinder head compression pressure
15 kg/cm
2
(213 psi, 1500 kPa)

Cylinder head warpage

0.05 (0.002)
Camshaft cam height
IN
34.2987 (1.371948)
34.14 (1.3656)
EX
34.1721 (1.366884)
34.02 (1.3608)
Valve rocker arm I.D.
IN
10 (0.4)～10.015 (0.4006)
10.1 (0.404)
EX
10 (0.4)～10.015 (0.4006)
10.1 (0.404)
Valve rocker arm shaft
IN
9.972 (0.399)～9.987 (0.3995)
9.9 (0.396)
O.D.
EX
9.972 (0.399)～9.987 (0.3995)
9.9 (0.396)
Valve stem O.D.
IN
4.975 (0.199)～4.99 (0.1996)
4.925 (0.197)
EX
4.955 (0.1982)～4.97 (0.1988)
4.915 (0.1966)
Valve guide I.D.
IN
5 (0.2)～5.012 (0.2005)
5.03 (0.2012)
EX
5 (0.2)～5.012 (0.2005)
5.03 (0.2012)
Valve stem-to-guide
IN
0.01 (0.004)～0.037 (0.0015)
0.08 (0.0032)
clearance
EX
0.03 (0.0012)～0.057 (0.0023)
0.1 (0.004)
TORQUE VALUES
Cylinder head cap nut 25 N•m (2.5 kgf•m, 18 lbf•ft) Apply engine oil to threads
Valve clearance adjusting nut 9 N•m (0.9 kgf•m, 6.5 lbf•ft) Apply engine oil to threads
Cylinder head cover bolt 12 N•m (1.2 kgf•m, 8.6 lbf•ft)
SPECIAL TOOL
Valve spring compressor E063

KYMCO X-Town 300 ABS Specifications

General

Brand	KYMCO
Model	X-Town 300 ABS
Category	Scooter
Language	English