A= 79,950mm
B= 79,960mm
C= 79,970mm
 
Vertex Big Bore forged piston kit.
Compression Ratio: 13.8:1
Cylinder bore: 80 mm
Displacement: 270 cc
Piston bore: 79.950 mm
Size above standard: 3 mm
 
YAMAHA        WR 250 F        250                    2020- 2024     
YAMAHA        YZ 250 F          250                    2019- 2024     
YAMAHA        YZ 250 FX       250                    2019- 2024