Yamaha TZ250M1, Owner'S Service Manual

Page: 109 / 287

CARBURETOR AND REED VALVE
4-11
EC464200
Needle valve
1. Inspect:
• Needle valve
1
• Valve seat
2
Grooved wear
a
≥
Replace.
Dust
b
≥
Clean.
NOTE:
Always replace the needle valve and valve
seat as a set.
EC464301
Throttle valve
1. Check:
• Free movement
Stick
≥
Repair or replace.
NOTE:
Insert the throttle valve
1
into the carburetor
body, and check for free movement.
EC464420
Jet needle
1. Inspect:
• Jet needle
1
Bends/Wear
≥
Replace.
• Clip groove
Free play exists/Wear
≥
Replace.
ENG
EC464801
FUEL LEVEL
1. Measure:
• Fuel level
a
Out of specification
≥
Adjust.
Fuel level:
6.0~7.0 mm (0.24~0.28 in)
Above the float chamber mating
surface
c
Measurement and adjustment steps:
• Remove the drain plug.
• Connect the fuel level gauge adapter
2
and fuel level gauge
1
to the float cham-
ber.
Fuel level gauge adapter:
YM-01470/90890-01470
Fuel level gauge:
YM-01312-A/90890-01312
≤