Yamaha Scorpio Service Manual page 152

CARBURETOR
4.Inspect:
Piston valve 1
G
Cracks → Replace.
Rubber diaphragm 2
G
Tears → Replace.
Jet needle 3
G
Bend → Replace.
NOTE:
If you suspect the piston valve has been dam-
aged, check the component for cracks by
pouring gasoline into the valve. If it leaks,
replace with a new piston valve.
5.Check:
Free movement
G
Insert the throttle valve into the carburetor
body, and check for free movement.
Stick → Replace.
6.Inspect:
Main jet 1
G
Needle jet 2
G
Pilot jet 3
G
Pilot screw 4
G
Pilot air jet 5
G
Bends/wear/damage → Replace.
Contamination → Blow out jets with a com-
pressed air.
7.Inspect:
Starter plunger assembly 1
G
5 - 6
CARB