onto the rod goes the piston. the piston is held on with a wrist pin which slides in through a hole in the piston. inbetween the rod and the piston is a wrist pin bearing. there are a couple thrust washers in there. the pin is held in by a circlip on each end. on the piston there are a couple of rings. if you look closely inside the grooves of the piston, the rings or the end of the rings go in a certain spot. otherwise they will not spring down into the piston and will stick up. everything nice and clean. if the cylinder was just bored clean it good with dawn and a brush. oil it up. post some pics of it smokin or brokin. here are some pics of all the stuff you need. http://www.partzilla.com/parts/search/Suzuki/ATV/1986/LT250R/CRANKSHAFT+%28MODEL+F-G%29/parts.html