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
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