Honda Hobbit eplacement 60cc chromed piston ring for this replacement Piston Kit only. (the piston rings on the new versions of the cylinder are smaller) Also fits the Yamaha YT60 60cc cylinder
Use the ring expander on the bottom ring. These help reduce piston slap noise. Better, worse? Some say don't bother as they increase risk of a part failure.
44mm x 1.5 FG