2016 YAMAHA WR 450F remove seats

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Page 247 of 426

YAMAHA WR 450F 2016  Owners Manual CYLINDER HEAD
6-20
EAS2GC1245REMOVING THE CYLINDER HEAD
1. Remove:• Cylinder head bolts
TIP
• Loosen the bolts in the proper sequence as shown.
• Loosen each bolt 1/2 of a turn at a time. After

Page 251 of 426

YAMAHA WR 450F 2016  Owners Manual VALVES AND VALVE SPRINGS
6-24
EAS2GC1250REMOVING THE VALVES
TIP
Before removing the internal parts of the cylin-
der head (e.g., valves, valve springs, valve 
seats), make sure that the valves are pro

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YAMAHA WR 450F 2016  Owners Manual VALVES AND VALVE SPRINGS
6-26
c. After installing the valve guide, expand the hole in the valve guide with the valve guide 
reamer “3” to obtain the proper valve-stem-
to-valve-guide clearance.
TI

Page 254 of 426

YAMAHA WR 450F 2016  Owners Manual VALVES AND VALVE SPRINGS
6-27
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a. Apply Mechanic’s blueing dye (Dykem) “b” onto the valve face.
b.