Yamaha CS50 - Page 121

CARB
CARBURETOR
6-4
4. Check:
• throttle valve 
Wear/Damage

Change
5. Check:
• throttle valve displacement
Irregular movement/Catches

Change
Insert the throttle valve  in the body 
and check its displacement.
6. Check:
• throttle stop screw 
• pilot air screw 
• jet needle 
• starter plunger 
Wear/Damage

Change
7. Measure:
• Float height
a
Outside specifications

Check valve,
float and valve seat

Steps for measuring the height of the float:
• Assemble the valve, float and axle on the
carburettor body
• Turn the carburettor upside down
• Using a vernier caliper, measure the distance
between the plane of the bowl gasket (wit-
hout the gasket) and the upper part of the
float.
Float height a
15.0 mm ~ 17.0 mm