Suzuki TU250X Service Manual page 77

3-30 ENGINE
• Cool down the new valve guides in a freezer for about one
hour and heat the cylinder head to 100 – 150 °C (212 – 302
°F) with a hot plate.

Do not use a burner to heat the valve guide hole to
prevent cylinder head distortion.
• Apply engine oil to the valve guide hole.
• Drive the valve guide into the hole using the valve guide
installer.

Replace the valve guide and ring with new ones.
NOTE:
Install the valve guide until the ring A contacts with the cylinder
head.
 09916-44910: Valve guide installer & remover
• After installing the valve guides, re-finish their guiding bores
using the valve guide reamer.
• Clean and oil the valve guides after reaming.
 09916-34542: Reamer handle
09916-34550: Valve guide reamer (5.5 mm)
NOTE:
* Be sure to cool down the cylinder head to ambient air temper-
ature.
* Insert the reamer from the combustion chamber and always
turn the reamer handle clockwise.