V1 RC hi-flow head

21.5mm intake, 19mm exhaust valve,  2009 to 2018 Zuma 125. Designed for pistons up to 59mm. Used in our 158, 167 and 175cc bore kits. Larger intake and exhaust ports. Combustion chamber is close to stock. Comes with valve springs and retainers. Must re-use your factory rocker arms and pins. If need a new set please contact us.