GOOFIT Completed Cylinder Head for 4 Stroke 110cc Engine for ATV Go Kart Fit for most Chinese made 4 stroke 110cc Engines Intake valve:23mm,exhaust valve:20mm,Timing Drive Sprocket-28 teeth Will not replace 125cc Cylinder Head with 23mm and 28mm Intake and Exhaust valves Arrival within 1-2 days (Sold by GOOFIT and Fulfilled by Amazon) Arrival within 7-15 days (Ships from and sold by GOOFIT)