Suzuki LT-Z90 Manual page 120

3-72 ENGINE
PISTON RING
• Install the piston rings in the order of oil ring, 2nd ring and 1st
ring.
• The first member to go into the oil ring groove is a spacer 1 .
• After placing the spacer, fit the two side rails 2 .
NOTE:
Side designations, top and bottom, are not applied to the spacer
and side rails: you can position each either way.
When installing the spacer, be careful not to allow its
two ends to overlap in the groove.
• Install the 2nd ring 3 and the 1st ring 4 to the piston.
NOTE:
1st ring and 2nd ring differ in shape.
• Be sure to bring the concave side of 1st ring to the top when
fitting it to the piston.
• 2nd ring has letter "RN" marked on the side. Be sure to bring
the marked side ring to the top when fitting it to the piston.
• Position the gaps of the three ring as shown. Before inserting
each piston into the cylinder, check that the gaps are so
located.
A INCORRECT
B CORRECT
A Exhaust side
B Intake side
5 2nd ring and lower side rail
6 Upper side rail
7 1st ring and spacer
120˚
120˚ 120˚