Hisun 700UTV, Maintenance Manual

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Measure the width of mating surfaces of valve
repairing limit value: 1.5mm
If the valve seat is to wide or narrow or cracked, grind
it to ensure impermeability.
4、Measure bore diameter of valve guide with internal micrometer
and special gauge.At last calculate clearance between valve
stem and valve guide.
Repairing limit value: intake : 0.12mm exhaust: 0.14mm
Note: Eliminate carbon in the pipe before
measuring.If the pipe will be replaced,grind the
valve seat again .
5、Inspection of valve and valve pipe:
Check whether the valve is bent, burn or the valve stem is
worn out.
Check the motion of valve and measure external diameter.
Repairing limit value: intake : 5.95mm exhaust: 5.95mm
See figure 2-21.
Fix valve into guide and look over the motion.