Yamaha YQ50 Service Manual page 115

CARBURETOR
3. Check :
• Needle valve Q
Wear/Contamination © Replace.
• Float W
Damage © Replace.
• Gasket
Damage © Replace.
322013
4. Check :
• Throttle valve Q
Wear/Damage © Replace.
322014
5. Check :
• Throttle valve free movement
Unsmooth/stickiness © Replace.
Insert the throttle valve Q into the carburetor
body W and check for smooth movement.
322015
6. Check :
• Throttle stop screw Q
• Air screw W
• Needle E
• Starter plunger R
Wear/Damage © Replace.
322016
7. Measure :
• Float height @
Out of specification © Inspect needle valve,
float, and valve seat.
a
322017
6-4
CARB
Float height @ :
15.0 ~ 17.0 mm (0.59 ~ 0.67 in)