61mm Big Bore Cylinder Kit w/Head for 125cc – 150cc GY6 Scooters, ATVs, and Go KartsSPECIFICATIONS: Piston Diameter: 61mmPiston Pin Diameter: 15mmPiston Pin Length: 42.5mmCylinder Head: Non-EGRCOMPATIBILITY: Amigo – 150cc Scooters, ATVsApollo – 150cc Scooters, ATVs, Go KartsBaotian – 150cc ScootersBaron – 150cc ScootersBintelli – 150cc ScootersBMS – 150cc Scooters, ATVs, Go KartsCoolster – 150cc Scooters, ATVs, Go KartsDiamo – 150cc Scooters, ATVsFlyscooter – 150cc ScootersGorilla Motor Works – 150cc ScootersIce Bear – 150cc Scooters, ATVs, Go KartsItalica – 150cc ScootersJCL – 150cc Scooters, ATVs, Go KartsJonway – 150cc ScootersKandi – 150cc Scooters, ATVs, Go KartsKinroad – 150cc Scooters, ATVs, Go KartsKMD – 150cc Scooters, ATVs, Go KartsLance – 150cc Scooters, ATVs, Go KartsLeike – 150cc ScootersLinhai – 150cc ScootersLongbo – 150cc ScootersMotobravo – 150cc Scooters, ATVs, Go KartsMotofino – 150cc ScootersMotorino – 150cc ScootersNST – 150cc Scooters, ATVs, Go KartsPeace – 150cc