One is Micro Swift for ages 7-9, and the other is Mini Swift for ages 9-13. In 2016, SKUSA divided the Cadet class into two age groups. The Rotax series uses the MicroMax engine configuration for 8-10 year olds, and the MiniMax engine configuration for 10-13 year olds. In addition, there is a 4-stroke Junior class - the Jr I Briggs & Stratton LO206 - for this age group. 7-12 years old: The Cadet class offers a 60cc 2-stroke class with a reliable and fairly simple engine from IAME or ROK that will hit over 50 mph.
Top speeds can vary but are generally around 30 mph, although we have tuned engines up over 40 mph in this class (for experienced racers only). Throttle stops can be adjusted to match a parent's comfort level with their kids. This is a "participation" class in our local Northwest series, no points or championships, the focus is on fun, safety, and learning. We carry both the Honda GXH50 and the Comer C50/51. Many clubs use the Honda GXH50 4-cycle engine - check your local series to see which is most popular before buying an engine. The most popular engine has been the Comer C50/51 2-cycle engine. and also referred to as "Baby Karts" or Micro karts these are usually powered by a small (50cc) 2-stroke engine similar to what you'd find on a chain saw.
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