DAELIM NS125DLX Service Manual page 91

● Insert the valve guide reamer into the combustion
chamber, and remove the carbon deposits.
NOTE
• Always insert the reamer while turning it right.
If it is inserted without turning, or while turning
left, interior part of guide will be damaged.
Tool: Valve guide reamer
● Measure, and record, the inner diameter of the
valve guide.
Service limit: 5.030mm(0.1980in)
● Check the clearance between the valve stem and
guide.
Service limit: I N: 0.090mm(0.0035in)
EX: 0.120mm(0.0047in)
● Measure the inner diameter of the new valve
guide. If the clearance is not within the service
limit, replace the valve.
Valve Guide Replacement
NOTE
•After changing the valve guide, make sure to
adjust the valve seat.
● Heat all cylinder heads uniformly to approximate
levels of 130~140℃
NOTE
•Do not allow the temperature to exceed 150℃
NOTE
•Take particular precautions as poor handling
may lead to serious burns.
•Do not locally heat the cylinder head with a gas
burner as it may cause cylinder head distortion.
Cylinder Head/Valve
Valve
guide
Valve guide
reamer
Valve
guide
driver
9-7