hsr-benelli S-series Service Manual page 64

Install the 2 piston ring (3) and the 1 piston ring (4).
nd st
NOTE:
The form and width of the 1st and 2nd piston ring are
different.
W4 = 3.1 ± 0.1 mm
W3 = 3.7 ± 0.1 mm
piston ringhave the letter "N" on the upper side.
The 1 and 2
nd
st
Make sure that the marked side is turned upwards when being
installed on the piston.
Piston Installation
Position the two piston rings (1) and the oil ring (2) on the
piston, positioning the opening at 120° from each other.
ver.2009_03 Page 64/215