The participating machines in the "Moto Mini 6 Hours" are subject to the rule that states, "vehicles with a 4-stroke engine with a displacement of 100cc or less that are commercially available for public roads (those with domestic type certification) and sports-specific vehicles recognized by the secretariat as having the same body structure as commercially available public road vehicles with a displacement of 100cc or less." Therefore, there are many entries for vehicles that are specially recognized by the secretariat (YAMAHA/TTR90, Honda/XR100R, CRF100F, XR80, XR70, XR50, CRF50, Z50R, DREAM50R). Additionally, modifications to the frame and other parts are strictly prohibited (though some modifications for mounting fairings are allowed), but it is permitted to change to a manufacturer-shipped engine of the same type with a displacement of 100cc or less that can be swapped on with bolts. Therefore, modifications such as installing the engine from a Honda APE100 into a Honda DREAM50R are officially recognized. Furthermore, regarding wheel size, there is a regulation that states, "the rim size of the wheel must be 12 inches or larger," but vehicles that originally come with a size of 12 inches or less can participate if they are changed to 12 inches or larger. As a result, many teams using vehicles like the Honda Monkey/Gorilla or vintage cars that meet the above regulations also participate. Additionally, by standardizing the carburetor diameter to φ22 and prohibiting the use of water-cooled engines and fuel injection, a certain level of equal conditions is maintained, which can be considered a significant feature of the vehicles participating in the "Moto Mini 6 Hours."

This is a race event held at the 4.8013 km Mobility Resort Motegi Racing Course using mini bikes with an engine displacement of 125cc or less.

• Moto Mini 6 Hours
  Entry capacity: 160 machines (including 10 invited by the organizer)