1991+ Kawasaki 650 SC Factory Service Manual, Page 69Get this manual
EiNGINE TOP END 5-5
Assembly Notes
any parts in the p:iston assemblies require repl!acement, or if the cylinder is honed or replaced, be sure to check the critical clearances of the new parts aoainst the values given in Specifications ,lnstal!1 the piston rinos so that the "N" marl [A] faces upwards as shown
,When installing the piston rings by hand, 1irst fit one end of the piston ring: against the plin in the ring groove, spread the ring opening wilth the other hand and then slip the ring into the groove Check to see that the pin [A] in each piston r:ing groove is between the ends of the piston ring