Yamaha YW50P Service Manual page 5

H O W T O U S E T H I S M A N U A L
This manual is intended as a handy, easy-to-read reference book for the mechanic. C o m p r e h e n s i v e
explanations of all installation, removal, disassembly, assembly, repair and check procedures are
laid out with the individual steps in sequential order.
( ~ The manual is divided into chapters. An abbreviation and symbol in the upper right corner of
each page indicate the current chapter. Refer to " S Y M B O L S " .
( ~ Each chapter is divided into sections. The current section title is shown at the top of each
page, except in Chapter 3 ("PERIODIC CHECKS A N D A D J U S T M E N T S " ) , w h e r e the sub-sec-
tion title(s) appears.
(~ Sub-section titles appear in smaller print than the section title.
( ~ To help identify parts and clarify procedure steps, there are exploded d i a g r a m s at the start of
each removal and disassembly section.
( ~ N u m b e r s are given in the order of the jobs in the exploded diagram. A circled n u m b e r indi-
cates a disassembly step.
( ~ S y m b o l s indicate parts to be lubricated or replaced. Refer to " S Y M B O L S " .
(~) A job instruction chart accompanies the exploded diagram, providing the order of jobs, names
of parts, notes in jobs, etc.
( ~ Jobs requiring more information (such as special tools and technical data) are described sequen-
tially.
®
®
Cvlinder head. Cylinder and piston
r e m o v a l
Engine
1
M u f f l e r / G a s k e t
2 A i r ~hroud (cylTnder head)
3 Spark IJlug
4 Cylinder head/Cylinder head gasket
Cylinder
6 Piston pin clip
7
Piston p i n / B e a r i n g
8
Piston
9 Piston
ring set
10
CyITnder gasket
Q'ty Rurllark~
Remove the pa~s En the order
Refer to the
"ENGINE REMOVAL"
sec-
tion
1/1
1
1
1/1
1
2
1
1
1
Reverse the r e m o v a l procedure f o r in
stallatien.
CYLINDEB HEAD" CYF~:N::R: P ~ ~
1.
R e m o v e :
• s a n n c
N o T E PI t pT I I p ~ )
Begore removing tha piston pin celt,, cover the
' c r a n k c a s e
with a
clean rag so y o u will not acci
Z. Ro,,,ovo:
•
Piston pTn
1~
• Piston ®
• Piston pin bearing ~
G A ~ O N ~
D o n o t use a h a m m e r t o d r i v e t h e piston pin
out_
C Y U N D E R H E A D I N S P E C T I O N
~. Elhxlin~te:
• Carbon deposits
Use a rounded ~crapper
@
•
Cylinder head
war~3age
Out of specification >Re 8ur'0ce.
W a r p a g e m e a s u r e m e n t a n d re s u r f a c e m e n t
• Attach a
=traight e d g e ~ a n d a thickness
g a u g e ( ~ on the cylinder head.
•
M e a s u r e the w a r p a g e
limit.
I
• If the w a r p a g e is out of
specification, reface
t h e cylinder head.
NOTE:
Rotate the head severaT tTres t o a v o i d r e m o v -
ing too m u c h moteriol f r o m o n e side.
4-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - -