CHAPTER 3B ENGINE 50cc/80cc ATV SERVICE MANUAL09.0
CHAPTER 3B ENGINE PAGE 3B - 12 -
Measure length of inner and outer springs
Used limit:
Inner spring below 26.1mm change
Outer spring below 30.5mm change
Valve and valve guide
Check if valve is curved, burnt or broken.
Check if valve and valve guide is blocked.
Measure every valve stem outer diameter.
Used limit: below 4.9mm change
Remove carbon deposit from valve guide
using a reamer.
Special tools
Rotate reamer is proper direction and do not
Stop rotation to push in or pull out.
Measure inner diameter of every valve guide.
Used limit: IN: above 5.3mm change
EX: above 5.3mm change
Valve guide replacement
Operate cylinder at the temperature of about
100℃～115℃ ( 212℉～239℉).
Heat cylinder head quickly and evenly to
prevent warpage.
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