produce and are capable of . However, being lighter than the twin cylinder (Division 1) karts they can be as quick on twisty circuits. This formula was previously known as 250 International. 125 Open - Powered by 125 cc engines producing and featuring six-speed sequential gearboxes, this class uses lighter chassis than the 250s and are the most agile of long circuit superkarts, they are capable of . Australian superkart divisions : Superkart racing in Australia has, since 1989, referred to any form of racing kart to race on full-size motor racing circuits, usually as sanctioned by the Australian ASN, CAMS. 250 cc International - commonly referred to as twins or inters, these karts are powered by twin cylinder engines and usually have six-speed sequential gearboxes. Several European and North American chassis are popular in addition to locally developed designs. 250 cc National - single cylinder class, the 250 National class is powered by 250 cc motocross engines and also feature six-speed sequential gearboxes. 125 cc Gearbox - most often powered by 125 cc Honda and Yamaha Grand Prix motorcycle engines equipped with six-speed sequential gearboxes, this superkart class uses mostly the same chassis as the 250 classes. They run at lighter weights than the 250 classes, which makes for close racing with mid-field 250 Nationals at some circuits. 80 cc Gearbox - also dominated by Honda and Yamaha motor cycle engines, 80 cc Gearbox is no longer a sanctioned class in Australian racing. Some 80 cc karts were noticeably smaller than 125/250 cc gearbox karts, with "laydown"-style karts, where the driver lies flat in the kart rather than sitting upright, proliferating. Last contested at the national level in 2005. and state level in 2008, some 80 cc karts survive racing in the 125 cc division at state level, but are uncompetitive as they no longer run at lighter homologated weight levels. 125 cc Rotax Max - a cross-over class from Australian short-circuit non-gearbox sprint kart racing to allow easier and cheaper graduation from sprint kart racing to long circuit racing. Three national championships exist for two weight divisions, Heavy, Light, and also sometimes a Junior division for drivers under the age of sixteen which run a version of the Rotax Max engine without a power valve. Rotax Max karts frequently race amongst gearbox-equipped superkarts at the state championship level, while racing for their own titles at the national level.