Baja WD250U Service Manual page 169

• Subtract the outer diameter of rocker shaft
from inner diameter of valve rocker hole to
calculate clearance.
Clearance between rocker hole and shaft= (a) - (b)
Inner diameter of valve rocker hole (a)
Outer diameter of rocker shaft (b)
Replace a set if unqualified
Clearance between rocker shaft and hole:
0.009~0.037mm (0.0004~0.0031 in)
Limit:
0.037mm (0.0015 in)
9. Timing chain
Check
• Timing chain
Replace it if the chain is stretched, or not
flexible or broken.
10. Timing sprocket and crankshaft sprocket
Check
• Timing chain
• Crankshaft sprocket (on crankshaft)
If there is wear and damage, replace the
sprocket and chain totally
11. Guide plate
1) Check
• Lower guide plate (1) (exhaust side)
• Upper guide plate (2) (intake side)
Replace it if it is worn or damaged
12. Chain tensioner
1) Check
• Pushing rod of chain tensioner (1)
• Washer (2)
Replace it if it is worn or damaged
168