Yamaha Rhino 450 YXR45FAV, Service Manual, Page: 80 / 413

3 - 4
CHK
ADJ
ADJUSTING THE VALVE CLEARANCE
7. Check:
• valve clearance
Out of specification
→
Adjust.
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a. Turn the crankshaft counterclockwise with a
wrench.
b. Align the “T” mark
1
on the rotor with the
stationary pointer
2
on the A.C. magneto
cover. When the “T” mark is aligned with the
stationary pointer, the piston is at the Top
Dead Center (TDC).
NOTE:
• When the piston is at the Top Dead Center
(TDC) on the compression stroke, there
should be clearance between the valve stem
tips and their respective valve adjusting
screws.
• If there is no clearance, rotate the crankshaft
counterclockwise one turn.
c. Measure the valve clearance using a thick-
ness gauge 3 .
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8. Adjust:
• valve clearance
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a. Loosen the locknut
1
.
b. Insert a thickness gauge
2
between the
adjusting screw end and the valve end.
c. Turn the adjusting screw
3
clockwise or
counterclockwise with the tappet adjusting
tool
4
until the proper clearance is
obtained.
Valve clearance (cold)
Intake
0.06 ~ 0.10 mm
(0.0024 ~ 0.0039 in)
Exhaust
0.16 ~ 0.20 mm
(0.0063 ~ 0.0079 in)
Valve adjuster 3 mm & 4 mm
P/N. YM-08035-A
Tappet adjusting tool
P/N. 90890-01311
1
2