54.75 - 55.05mm Yamaha KT100 Big Bore Pistons & Rings - Big bore piston kits available for the Yamaha KT100SE ranging from 54.75mm to 55.05mm to achieve 108cc+ displacement out of the engine. The kits come complete with the piston, ring, pin and clips. These piston kits can also be used in other various engines utilizing the 14mm wrist pin but may require a spacer between the cylinder and cases or other machine work Piston dimension references: 54.75mm to 55.05mm diameter 14mm wrist pin 59.5mm +/- overall height 26.5mm +/- from wrist pin C/L to top of dome 23mm +/- from wrist pin C/L to controlling edge of dome