KYMCO People S 250, Service Manual

Page: 72 / 229

6
. CYLINDER HEAD/VALVES
6-2
PEOPLE 250
SERVICE INFORMATION
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.
SPECIFICATIONS Standard (mm) Service Limit (mm)
Item BC50AA BC50AA
IN 0.10
0.10
æ
æ
EX 0.10
0.10
æ
æ
Cylinder head compression pressure 15kg/cm
_
15kg/cm
_
æ
Cylinder head warpage
æ
æ
0.05
0.05 IN 34.2987 34.14
EX 34.1721 34.02
IN 10.00
_
10.015
10.00
_
10.018
10.10
10.10 EX 10.00
_
10.015
10.00
_
10.018
10.10
10.10 Valve rocker arm shaft IN 9.972
_
9.987
9.972
_
9.987
9.9
9.9 O.D. EX 9.972
_
9.987
9.972
_
9.987
9.9
9.9 IN 1.2
1.2
1.8
1.8 EX 1.2
1.2
1.8
1.8 IN 4.990
_
4.975
4.990
_
4.975
4.925
4.925 EX 4.970
_
4.955
4.970
_
4.955
4.915
4.915 IN 5.00
_
5.012
5.00
_
5.012
5.03
5.03 EX 5.00
_
5.012
5.00
_
5.012
5.03
5.03 Valve stem-to-guide IN 0.010
_
0.037
0.010
_
0.037
0.08
0.08 clearance EX 0.030
_
0.057
0.030
_
0.057
0.10
0.10
TORQUE VALUES
Cylinder head cap nut 24.5N-m Apply engine oil to threads
Valve clearance adjusting nut 8.8N-m Apply engine oil to threads
Cylinder head cover bolt 7.8
_
11.8N-m
SPECIAL TOOL
Valve spring compressor E040
Valve clearance (cold)
Camshaft cam height
Valve rocker arm I.D.
Valve guide I.D.
Valve stem O.D.
Valve seat width