Valve And Valve Guide; Remove Carbon Deposit From Valve Guide; Valve Guide Replacement - Linhai ATV 260 Service Manual

CHAPTER 3B ENGINE 50cc/80cc
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.
ATV SERVICE MANUAL07.0
CHAPTER 3B ENGINE PAGE 3B - 12 -