Today's go karts are anything but greasy kids stuff. Read on to discover what makes these these mechanically impressive machines tick. Some people love go kart racing – simply called “karting” by the true blue fans – because of the competition. Others love it for the family atmosphere at events. Still others love it because of the vehicles themselves – and, if you’re a DIYer, you’ll probably want to know just how these racing machines are constructed. Recreational participants sometimes construct their own vehicles, while competitive racers must purchase factory-made ones. It’s all about safety. Racers on big tracks reach speeds of up to 152 miles per hour in professional-grade karts that typically weigh 165 to 175 pounds (75 to 79 kilograms). Here’s more... Engines “The TaG division,” says John Ferris, president of the World Karting Association, “is the most popular. TaG stands for ‘touch and go’ and its vehicles have an electric start, like a car, while the other divisions need an external starter, like Indy cars. TaG vehicles have water-cooled engines, while the rest have air-cooled ones.” Typically, backyard / amusement park karts are powered by 4-stroke engines or electric motors, while racing karts use small 2-stroke or 4-stroke engines. “All classes of racing,” John says, “allow the owner to work on the engine – or to hire someone else to do so – by putting in new pistons or rings and the like. Some classes allow for rebuilding of engines that include modifications to make the kart go faster.” The sport has evolved over the years and here is just one way in which that’s true. “Classes that allow modifications used to be the most popular,” John explains. “In these open classes, you could modify however you wanted – at least within certain limits. Local Saturday tracks, sometimes called outlaw tracks, still have those classes, but there is no tinkering in the big races. Those races are like NASCAR with strict specifications for engines.” When people do modify engines, they typically take a factory built one and bring the specs up to the limits, perhaps by raising ports – or by lowering ports. “You can’t add extra ports,” John cautions, “because you need to use stock engines.” More specifically:
- 4-stroke engines are typically air-cooled, with about 5 to 20 HP. Manufacturers include Briggs & Stratton, Tecumseh, Kohler, Robin and Honda.
- More powerful 4-stroke engines are manufactured by Yamaha, TKM, Biland and Aixro (Wankel), offering up 15 to 48 HP.
- 2-stroke engines are built by WTP, Comer, IAME (Parilla, Komet), TM, Vortex, Titan, REFO, TKM, PRD, Yamaha and Rotax, ranging from about 8 HP for a single-cylinder 60 cc unit to more than 90 HP for a twin 250 cc.
- The most popular classes use TaG 125 cc units, which are electronically limited to 16,000 RPM.
Last updated June 6, 2018