Piston Pin; Piston Ring - Yamaha GT1 Service Manual

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Piston Pin · Piston Ring
4-5. Piston Pin
A. Pulling out the Piston Pin
Remove the clips at one end of the piston pin with
needle nose pliers, and press out the piston pin with
a finger or a slot-head screw driver.
Note: Before removing the piston pin clips, cover the
crankcase with a clean rag, so you will not
accidentally drop the clip or other foreign
particles into the crankcase.
Fig. 4-5-1
B. Piston-to-Piston Pin Fit
The piston pin should fit snugly in its bore so that it
drags a little as you turn it. If the piston pin is
loose, replace the pin and/or the piston.
lf the pin has step-wear in its center, replace the
needle bearing as well as the piston pin. Check the
small end of the connecting rod for wear by inserting
the piston pin and bearing.
Fig. 4-5-2
-22-
Fig. 4-5-3
4-6. 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 ring by
moving the ring off the piston on the other side of
the ring ends.
Fig. 4-6-1
Fig. 4-6-2