Yamaha WR45OFR service manual Valve Clearance Adjustment

VALVE CLEARANCE ADJUSTMENT

INSP

ADJ

b

a

4.Check:

●Valve clearance

Out of specification → Adjust.

Valve clearance (cold):

Intake valve:

0.10~ 0.15 mm (0.0039 ~ 0.0059 in)

Exhaust valve:

0.20~ 0.25 mm (0.0079 ~ 0.0098 in)

Checking steps:

●Turn the crankshaft counterclockwise with a wrench.

●Align the T.D.C. mark a on the rotor with the align mark b on the crankcase cover when piston is at T.D.C. on compression stroke.

NOTE:

In order to be sure that the piston is at Top Dead Center, the punch mark c on the exhaust camshaft and the punch mark d on the intake camshaft must align with the cyl- inder head surface, as shown in the illustra- tion.

●Measure the valve clearance e using a feeler gauge 1.

NOTE:

Record the measured reading if the clear- ance is incorrect.

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