Service Information - KYMCO X-Town 300 ABS Service Manual

6. CYLINDER HEAD/VALVES

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