Yamaha 2003 yz85, Owner'S Service Manual

Page: 216 / 506

4 - 10
ENG
CARBURETOR AND REED VALVE
Float height
1. Measure:
●
Float height
a
Out of specification
→
Adjust.
Float height:
18 ~ 20 mm (0.71 ~ 0.79 in)
Measurement and adjustment steps:
●
Hold the carburetor in an upside down
position.
●
Measure the distance between the mating
surface of the float chamber and top of the
float using a vernier calipers.
NOTE:
The float arm should be resting on the nee-
dle valve, but not compressing the needle
valve.
●
If the float height is not within specification,
inspect the valve seat and needle valve.
●
If either is worn, replace them both.
●
If both are fine, adjust the float height by
bending the float tab
b
on the float.
●
Recheck the float height.
5PA40180
5PA40190
EC464600
Float
1. Inspect:
●
Float
1
Damage
→
Replace.
5PA40200
EC464701
Reed valve
1. Measure:
●
Reed valve bending
a
Out of limit
→
Replace.
Reed valve bending limit:
0.2 mm (0.008 in)
5PA40210