Formula 1: up to 125cc 4stroke/ 62cc 2stroke (no gp chassis allowed)
Super Mini: up to 150cc liquid cooled 4stroke, 195cc air cooled 4stroke, and 105cc 2stroke
Stock 125cc: xr100, crf100, ttr125L, Grom, Z125, Benelli 135, Evader Pro (Chinese grom clone). everything must be stock except these allowed changes; front fork internals and springs, rear shock internals and springs, bars, controls, gearing, tires, and drop in air filters. If it doesn't say you can change, you CAN NOT change it. NO RACE GAS
Monkey Bike: Grom, Z125, Honda Monkey, Benelli 135, Chinese Grom/Monkey/Benelli style chassis. This is a Superstock class, Everything must be stock except these allows changes; Front fork internals and springs, Rear shock, gearing, bars, controls, drop in air filter, and tires. If it doesn't say you can change it, you CAN NOT change it.
Stock 50cc: Air-cooled 50cc bikes with OEM frame and engine cases only; stock engine internals, carburetor, ignition, and ECU required, with changes allowed only to exhaust, gearing, tires, and suspension, and no big bore kits or race fuel.
Stock 450cc: Up to 450cc 4-stroke bikes with OEM frame and engine cases and stock engine internals required; exhaust, gearing, tires, and suspension changes are allowed, but no ECU tuning, big bore kits, internal engine modifications, or race fuel.
E-Bike: Contact SEMM with specific questions regarding e-bikes as this class is growing.