5-4
CARB
CARBURETOR
8. Check:
8
Jet needle kit
1
8
Main nozzle
2
8
Main jet
3
8
Pilot jet
4
Bends/damage/wear
→
Replace.
Obstruction
→
Clean.
Blow out the jets with compressed air.
9. Check:
8
Throttle valve movement
Insert the throttle valve into the carbu-
retor
Body and move it up and down.
Tightness
→
Replace the piston valve.
10. Check:
8
Vacuum hose
8
Fuel hose
Cracks/damage/wear
→
Replace.
Obstruction
→
Clean.
Blow out the hoses with compressed air.
1
2
3
4
11. Measure:
8
Float height
a
Out of specification
→
Inspect needle
valve, float and valve seat.
Float height:
15 ~ 17 mm (0.59 ~ 0.67 in)
***************************************
Float height measurement steps:
8
Install the needle valve, float and float pin to
the carburetor body.
8
Hold the carburetor in an upside down posi-
tion.
8
Measure the distance between the mating
surface of the float chamber (gasket re-
moved) and top of the float using a gauge.
Summary of Contents for YW50AP
Page 1: ...YW50AP 5PJ F8197 10 LIT 11616 15 39 ...
Page 214: ...YAMAHA MOTOR TAIWAN CO LTD ...
