Cylinder Head/Valve
Service Information
General Safety
● The rocker arm and the camshaft can be serviced without removing the engine. However, the engine must
be removed from the frame to maintain the cylinder head.
● The oil of camshaft oil is supplied through the cylinder head oil hole. Clean the oil hole prior to
assembling the cylinder head.
Specifications
9-1
9. Cylinder Head/Valve
Services information 9-1
Troubleshooting 9-2
Camshaft Removal 9-3
Cylinder Head Removal 9-5
Cylinder Head Disassembly 9-5
Valve guide replacement 9-7
Valve seat Inspection/Adjustment
9-8
Cylinder head Assembly 9-11
Cylinder Head Installation 9-12
Camshaft Assembly 9-13
Item Standard value Service limit
Rocker arm
Rocker arm inner diameter 12.016-12.034(0.4731-04738) 12.060(0.4748)
Rocker arm shaft outer diameter
11.982-12.000(0.4717-0.4724) 11.950(0.4705)
Cam height
IN 33.835-33.995(1.321-1.3384) 33.625(1.3234)
Camshaft EX 33.984-34.144(1.380-1.3443) 33.765(1.3293)
Camshaft inner diameter 15.005-15.018(0.5907-0.5913) 15.040(0.5921)
Cylinder head warpage - -
Valve spring free length
IN, EX 37.21(1.465) 36.90(1.4528)
Valve stem
IN 4.972-4.984(0.1957-0.1962) 4.920(0.1937)
EX 4.952-4.964(0.1950-0.1954) 4.900(0.1929)
Valve
Valve guide IN, EX 5.000-5.012(0.1969-0.1973) 5.030(0.1980)
Valve guide
Clearance between
IN 0.016-0.040(0.0006-0.0016) 0.090(0.0035)
stem and guide
EX 0.036-0.060(0.0014-0.0024) 0.120(0.0047)
Valve seat width 0.8~1.0(0.031~0.039) 1.4(0.055)
Unit: mm(in)
Torque values
● Cam chain tensioner pivot bolt 1.0kg-m(10N.m, 7ft-lb)
● Spark plug 1.2kg-m(12N.m, 8ft-lb)
● Camshaft holder 8mm nut 2.0kg-m(20N.m, 14ft-lb) - Apply engine oil
● Cam chain tensioner mounting bolt 1.2kg-m(12N.m, 9ft-lb) - Apply engine oil
● Cam chain tensioner sealing screw 0.4kg-m(4N.m, 2.9ft-lb)
● Cylinder head cover bolt 0.9kg-m(9N.m, 6.5ft-lb)
9
To Next Page
Loading...
Need help?
General
