CHAPTER 3B ENGINE 50cc/80cc ATV SERVICE MANUAL09.0
CHAPTER 3B ENGINE PAGE 3B - 6 -
3.2 Cylinder head、Valve
3.2.1 Important information
●When working on the cylinder head and valve train, always use engine oil to lubricate sliding parts
when assembling. Never assembly dry parts into the valve train.
●The camshaft is lubricated by engine oil supplied via an oil passage in the cylinder head. Make sure
this passage is clean and open when you reassemble the head.
●When measuring parts to determine wear, wash the parts with solvent and dry them in order to get
accurate measurements.
●When disassembling the valve components, keep them in order, and reinstall them in the reverse
order.
Standards
item Standard value Used limit
IN 0.04-0.06
━
Valve gap (cold)
EX 0.04-0.06
━
Cylinder head compressed pressure 15kg/cm
2
-600rpm
━
Cylinder head surface twisting 0.05
IN 25.749 25.681
Camshaft convert angle height
EX 25.55 25.524
IN 10.0-10.022 10.10 Valve rocker arm inner
diameter
EX 10.0-10.022 10.10
IN 9.972-9.987 9.91 Valve rocker arm bearing outer
diameter
EX 9.972-9.987 9.91
IN 1.0 1.8
Valve seat angle
EX 1.0 1.8
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