We should also make the Aixro XR50 legal as well.
Change the 19.1.D.4 to
Engines must be either a) mass produced single cylinder two-stroke engines not to exceed 125 cc or b) mass produced single, twin cylinder or rotary, four-stroke engines not to exceed 295 cc of total displacement. No prototype, pre-production, “works-type” motors or road race engines are allowed. Shifter or gearbox type motors are prohibited. Karts with engines under this specification must run at a minimum weight of 360 lbs.