Yamaha 2008 YW50X Service Manual page 165

OA"BO"ETO" ICA"BI V
. Check:
• Jet n e e d l e kit ( ~
• M a i n nozzle ~ )
• M a i n jet ( ~
• Pilot jet ( ~
B e n d s / d a m a g e / w e a r --> Replace.
O b s t r u c t i o n --> Clean.
B l o w o u t the jets w i t h c o m p r e s s e d air.
9. Check:
• T h r o t t l e v a l v e m o v e m e n t
Insert the t h r o t t l e v a l v e into t h e c a r b u -
retor
B o d y and m o v e it up and d o w n .
T i g h t n e s s --> Replace the p i s t o n valve.
10. Check:
• V a c u u m hose
• Fuel hose
C r a c k s / d a m a g e / w e a r --> Replace.
O b s t r u c t i o n --> Clean.
B l o w o u t t h e hoses w i t h c o m p r e s s e d air.
11. M e a s u r e :
• Float h e i g h t (~)
O u t o f s p e c i f i c a t i o n - - > l n s p e c t n e e d l e
v a l v e , float and v a l v e seat.
Feat he0ht I
15 - 17 m m (0.59 ~ 0.67 in)
* * * * * * * * * * * * * * * * * * * * ~ ~ ~ ~ ~ ~ ~ ~ ~
F l o a t h e i g h t m e a s u r e m e n t s t e p s :
• Install the n e e d l e v a l v e , float and float pin to
the c a r b u r e t o r body.
• Hold the c a r b u r e t o r in an u p s i d e d o w n posi-
t i o n .
• M e a s u r e the d i s t a n c e b e t w e e n t h e m a t i n g
s u r f a c e o f t h e f l o a t c h a m b e r ( g a s k e t re-
m o v e d ) and t o p of t h e float u s i n g a g a u g e .
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