Yamaha YW50P Service Manual page 76

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P I S T O N PIN A N D P I S T O N R E M O V A L
1. Remove:
• Piston pin clip ( ~
N O T E :
Before r e m o v i n g the p i s t o n pin clip, c o v e r the
crankcase w i t h a clean rag so y o u w i l l not acci-
d e n t a l l y d r o p t h e clip into the crankcase.
2. Remove:
• Piston pin ( ~
• Piston ~ )
• Piston pin b e a r i n g ( ~
CAUTION:
Do not use a h a m m e r t o d r i v e t h e p i s t o n pin
out.
C Y L I N D E R H E A D I N S P E C T I O N
1. E l i m i n a t e :
• C a r b o n d e p o s i t s
Use a r o u n d e d s c r a p p e r (~.
2. Inspect:
• C y l i n d e r head w a r p a g e
Out of specification-->Re-surface.
W a r p a g e m e a s u r e m e n t and r e - s u r f a c e m e n t
steps:
• A t t a c h a s t r a i g h t e d g e ( ~ and a t h i c k n e s s
g a u g e ( ~ on the c y l i n d e r head.
• M e a s u r e the w a r p a g e limit.
I l aroaoe" 't"
I
0.03 m m ( 0 . 0 0 1 2 in)
• If the w a r p a g e is o u t of s p e c i f i c a t i o n , reface
the c y l i n d e r head.
N O T E :
Rotate the head severai tires to a v o i d r e m o v -
ing t o o m u c h material f r o m one side.
4 - 4 ~ ~ ~ ~ ~ ~