8-6
CYLINDER HEAD/CYLINDER/PISTON
Piston Pin Inspection
● Measure the piston pin O.D. at three points.
● Replace the piston pin if the service limit is exceeded.
SERVICE LIMIT : 11.98mm
Piston Pin Bore Inspection
● Measure the piston pin bore I.D. in an X and Y axis.
Take the maximum reading to determine the I.D.
●Replace the piston if the I.D. is over the service limit.
SERVICE LIMIT : 12.03mm
PISTON/PISTON RING INSTALLATION
● Clean the piston ring grooves.
● Lubricate the piston rings and ring grooves with clean
2-stroke oil.
● Install the piston rings on the piston with the marks
facing up.
·Do not confuse the top and second rings. Be sure to
install them in the proper grooves.
·Some 2-stroke engines use an expander ring behind
the second ring.
● In 2-stroke engines, theh piston has stopper pins that
hold the piston rings away from the intake and exhaust
ports.
● Align the piston ring end gaps with the stopper pins.
● Check the fit of each ring in tis groove by pressing the
ring into the groove. Make sure that it is flush with the
piston at several points around the ring.
● If the ring rides on the stopper pin, it is damaged during
assembly.
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