GOOFIT 40mm Piston Kit Assembly for 2 Stroke 47cc 49cc Zenoah G23LH G2D Goped Sport Liquimatic Bigfoot X-Ped Go-Quad Fit for Zenoah G23LH G2D Goped Sport Liquimatic Bigfoot X-Ped Go-Quad The diameter:40mm,height 33mm. please check with your stock piston before purchase One week money back guarantee if not satisfied Arrival within 1-2 days (Sold by GOOFIT and Fulfilled by Amazon) Arrival within 7-15 days (Ships from and sold by GOOFIT)