Yamaha YFM250XL(C) Service Manual page 182

5
CARBURETOR
8.Inspect:
Throttle stop screw 1
Pilot screw 2
Contamination/wear → Replace.
O-ring 3
Damage → Replace.
9.Check:
Free movement (piston valve)
Sticks → Replace.
Insert the piston valve into the carburetor
body, and check for free movement.
10.Check:
Free movement (throttle valve)
Sticks → Replace.
ASSEMBLY
Reverse the "DISASSEMBLY" procedure.
Note the following points.
CAUTION:
Before reassembling, wash all of the parts
in a clean petroleum based solvent.
Always use a new gasket.
1.Install:
Diaphragm (coasting enricher) 1
Spring 2
Cover 3
NOTE:
Match the tab on the rubber diaphragm to
the matching recess in the carburetor body.
2.Install:
Needle jet 1
NOTE:
Align the cut end of the needle jet with the
slot on the body.
5 - 6
CARB