JE's single piston for the Honda CRF150 is specified at 13:1 and intended as a direct-replacement piston for rebuilds and repairs on CRF150 models. Supplied individually, the piston matches the 13:1 specification noted in the source and gives owners and technicians a specific replacement option for top-end service or piston replacement.
JE Pistons Honda CRF150 13 to 1 Piston Single