Yamaha YZ250(P)/LC, Owner'S Service Manual

Page: 234 / 584

4-11
ENG
CARBURETOR AND REED VALVE
EC464401
Jet needle
1. Inspect:
9
Jet needle
1
Bends/Wear
→
Replace.
9
Clip groove
Free play exists/Wear
→
Replace.
9
Clip position
*For EUROPE
EC464511
Float height
1. Measure:
9
Float height
a
Out of specification
→
Adjust.
Standard clip position:
No.2 Groove
*No.3 Groove
Float height:
5.5~7.5 mm (0.22~0.30 in)
Measurement and adjustment steps:
9
Hold the carburetor in an upside down posi-
tion.
9
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.
9
If the float height is not within specification,
inspect the valve seat and needle valve.
9
If either is worn, replace them both.
9
If both are fine, adjust the float height by
bending the float tab
b
on the float.
9
Recheck the float height.
5NX-9-30-4A 6/5/01 4:12 PM Page 22