Yamaha YZ450FA Automobile User Manual


 
4-17
CAMSHAFTS
INSTALLING THE CAMSHAFT
1. Install:
• Exhaust camshaft "1"
• Intake camshaft "2"
Installation steps:
a. Turn the crankshaft counterclockwise with a
wrench.
• Apply the molybdenum disulfide oil on the
camshafts.
• Apply the engine oil on the decompression
system.
Fill the cylinder head with engine oil up to the
tops "a" of the valve lifters.
b. Align the alignment mark "a" on the rotor
with the alignment mark "b" on the crank-
case cover.
The alignment mark "a" on the rotor is there
for camshaft installation. This alignment
mark is stamped 23° ATDC.
c. Fit the timing chain "3" onto both camshaft
sprockets and install the camshafts on the
cylinder head.
Make sure that the alignment mark "c" on the
exhaust camshaft sprocket and the alignment
mark "d" on the intake camshaft sprocket are
aligned with the edge of the cylinder head.
Do not turn the crankshaft during the cam-
shaft installation. Damage or improper
valve timing will result.