Piston Ring - Yamaha JT1 Series Service Manual

ENGINE· Piston Ring
B Piston•to-Piston pin fit
The piston pin should
fit
snugly in its bore so that it drags a htt!e as you turn 1t. If the piston pin is loose
replace the pin and/or the piston
If the pin has step-wear m I1s center, replace the needle bearing as well as the piston pm, Check the small
end of the connecting rod for wear by inserting the piston pin and bearing
F,g 3-4-2 Fig 3-4-3
3-5 Piston Ring
A Removing the Piston Rings
Put your thumbs at each end of the piston ring and pull the
piston
ring ends apart
Remove the nng by moving the ring off the piston on the other
side
of the
ring
ends and
lifting
up.
F,g 3-5-1
B Installing the Piston Rings
First
flt
No.2 nng over the
piston.
and then the
No 1 ring. and align their end gaps with the locat-
ing pin
in
ec> · ru~'"g groove. (Fig. 3-5-3)
The printing on
a11 ,
lngs must face up to position
the gap properly at the pin
Fig 3-5-2
Fig 3-5-3
- 1 8 -
1rst
Second
Locating knock pin
/
,
/
~
Piston
ring