The current price of a KA is good bargain thru the end of the month. Have raced a Rotax but not an X-30. There are more pluses for the X-30 over the Rotax. Must say the Rotax was very reliable. Keep in mind it needs a fully charged battery, the power value must be kept clean and the exhaust packing must be changed on occasion. Also to have it run as efficiently as possible you are going to need change the carb jetting and spark plug. Any decent priced Rotax may require many expensive modifications to make it race legal. Check any organization you might race with.
LAD Specialties customer / tony kart / rotax / kt100