Yamaha YZ Serie Fahrer- Und Wartungshandbuch Seite 228

CARBURETOR AND REED VALVE
4-10
2. Inspect:
9 Main jet 1
9 Main jet holder 2
9 Pilot jet 3
Contamination
NOTE:
9 Use a petroleum based solvent for cleaning.
Blow out all passages and jets with com-
pressed air.
9 Never use a wire.
EC464200
Needle valve
1. Inspect:
9Needle valve 1
9Valve seat 2
Grooved wear a
Dust b
Clean.
NOTE:
Always replace the needle valve and valve seat
as a set.
EC464301
Throttle valve
1. Check:
9Free movement
Stick Repair or replace.
NOTE:
Insert the throttle valve 1 into the carburetor
body, and check for free movement.
EC464401
Jet needle
1. Inspect:
9Jet needle 1
Bends/Wear Replace.
9Clip groove
Free play exists/Wear
9Clip position
Standard clip position:
No.3 Groove
ENG
Clean.
Replace.
Replace.