Baja WD250U Service Manual page 167

CAUTION:
Must install the long pitch end of all valve
spring upward
2) Check the valve seal
If there is leakage on the valve face, repair
again and regrind or replace the valve and
regrind.
Inspecting procedure of valve seal
• Inject the clean solvent (1) into intake way
and exhaust way respectively.
• Check the valve seal. There should be no
leakage on valve race (2)
3) Regrinding procedure
• Remove components of the cylinder cover
again
• Grind repeatedly with fine grinding
powder
• Clean totally
• Reassemble and check the leakage with
solvent
• Repeat above procedures until getting ideal
seal
7. Distribution cam
1) Check
• Distribution cam
Replace if there is cave, scratch, or
discoloration
2) Measure
• Distribution cam (use micrometer)
Unqualified→ Replace
166