Yamaha YW50P Service Manual page 111

KS.AFT I E"O I o '1
C R A N K S H A F T R E M O V A L
1. Attach:
• Crankcase s e p a r a t i n g tool ( ~
~ l Crankcase s e p a r a t i n g t o o l :
Y U - 0 1 1 3 5 - A
2. Remove:
• C r a n k s h a f t ( ~
NOTE:
Make sure the crankcase s e p a r a t i n g tool is cen-
tered o v e r t h e c r a n k s h a f t a s s e m b l y .
F
--H ~-- D
C R A N K S H A F T I N S P E C T I O N
1. Measure:
• R u n o u t l i m i t
" C "
• C o n n e c t i n g rod big end side clearance
iJ g rr
• Small end free play l i m i t
" F "
Out of specification-->Replace.
Use V-blocks, dial g a u g e and t h i c k n e s s
g a u g e .
R u n o u t l i m i t
" C " :
0.03 m m ( 0 . 0 0 1 2 in)
C o n n e c t i n g rod big end side clear-
ance
" D " :
0.2 ~ 0.5 m m ( 0 . 0 0 7 9 ~ 0.020 in)
Small end free play " F ' :
0.4 ~ 0.8 m m ( 0 . 0 1 6 ~ 0.031 in)
2. Inspect:
• B e a r i n g s (crankshaft)
Spin the b e a r i n g i n n e r race.
Excessive play/Ro ugh n ess-->Replace.
Pitting/Da mage--~Replace.
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