Rule changes for 2020

With the 2019 season in the books, Cascadia Mini Moto is asking for your help with next year's rulebook. If you have feedback, class suggestions, or rule change requests, please submit them to

Until the 2020 rulebook is finalized, all rules below should be considered PROVISIONAL AND NON-BINDING. Some class rules will be changing, particularly Mini Motard, so please ask before you begin building a new bike for a specific class.

The rulebook for the Cascadia Mini Endurance challenge is available here. THE RULEBOOK IS AUTHORITATIVE, THIS WEB PAGE IS NOT.

If you have feedback on the rulebook, please contact us via email or join the discussion on our Facebook page.

This page is a summary of rules, not the rulebook, and will not be considered authoritative if it conflicts with the rulebook linked above.

Reading the rule book is vital for all racers; it contains important information on preparation, racer conduct, and safety. READ THE RULES BEFORE YOU RACE.

Bike Prep

See the rule book for full details. In short:

Motorcycles must be in a safe, ready-to-race condition as determined by the technical inspector. All controls must be operational, including the kill switch, and there may not be any leaks, cracks, missing parts, etc.

Rounded bar ends (plastic is OK) or bark busters are required. Axle sliders are required for Open class motard-style motorcycles. Peg sliders are required for all motard-type motorcycles.

Transponders may be required; if so, they will be available for rent and reserved as part of the pre-registration process.

The following must be safety wired:

    • Oil drain bolts and oil filter cover bolts (filter bolts may use a silicone dab).
    • Oil fill plugs. R-clips are permitted.
    • External oil filters (using a hose clamp around the filter wired to a hard point).
    • Brake pad retaining pins must be secured with an R-clip or safety wire if not screwed in; they may be secured with a screw cap or dab of silicone if they are a screw-in type.

Other parts must be secured with safety wire, silicone, or clamps - see Section 4.2 in the rule book for details.

Teams & Rider Prep

Teams may consist of any number of riders. Riders must have appropriate gear for an asphalt race - race leathers or MX gear with full armor underneath. Textile riding suits are also acceptable. Please see Section 7.3 of the rulebook for complete information on rider safety equipment.

Teams should register online prior to race day. Race day registrations will be allowed, but will cost extra. Riders for each team may register the day of the race for no extra charge.

Teams will need to conduct pit stops during the race for refueling. Pit stops have special rules and require at least two people and a fire extinguisher. All riders must read and understand pit stop rules in the race rulebook. Teams will be flagged and/or docked points for unsafe pit procedures.


There are five classes in the Cascadia Mini Endurance Challenge:

    • Junior - Riders under 18 using Mini Motard or Sportbike-legal motorcycles
    • Mini Motard
    • Mini Sportbike
    • Mini Superbike
    • Open

Waivers for classes may be made on a case-by-case basis; contact Cascadia Mini Moto if you would like to request a waiver to run a non-conformant motorcycle (i.e. scooter, etc) in a specific class.


The Junior class is for younger riders looking to gain racing experience.

  • Only one rider over age 15 is allowed on the team.
  • Motorcycles must be legal in either Mini Motard or Mini Sportbike. Larger-displacement motorcycles are not allowed in the Junior class.

Mini Motard:

Mini Motard is for low-power, low-cost motard-framed motorcycles under 125cc with a minimal number of changes.

  • Motorcycle must have been delivered from the factory with knobby tires and handlebars rather than clip-ons.
  • At least one wheel must be an OEM size.
  • Must be air cooled. Air-oil cooled permitted if offered OEM; aftermarket oil coolers are not allowed.
  • OEM or OEM-equivalent head. Aftermarket heads with oversized valves are not allowed.
  • OEM type brakes. Drum brakes cannot be replaced with disc brakes.
  • Displacement limits:
      • 4-stroke air cooled 2 valves: 125cc max
      • 4-stroke air cooled 4 valves: 100cc max
      • 2-stroke air cooled: 60cc max

Mini Sportbike:

A class for lower-displacement small-frame minis such as the Ohvale 110, Honda Grom, Yamaha YSR50, Honda NSR50, Honda NSF100, Kawasaki Z125, SSR 125, etc.

  • 12” or smaller rear wheel, 14” or smaller front wheel.
  • At least one wheel must be an OEM size.
  • Displacement limits:
      • 4-stroke air-cooled: 125cc max
      • 4-stroke water cooled: 75cc max
      • 2-stroke air-cooled: 75cc max
      • 2-stroke water cooled: 50cc max

Mini Superbike:

This class is for larger-displacement minis or heavily-modified small minis. Examples include the Ohvale 160, Kawasaki KX65, Aprilia RS50, Derbi 50, Metrakit, Kayo MR125, heavily modified XR100/TTR-125 motorcycles, Honda CRF150F, and Kawasaki KLX-140. It is roughly equivalent to Texas Mini GP Formula 5.

  • Unlimited chassis and engine modifications
  • Displacement limits:
      • 2 stroke air cooled: 100cc max
      • 2 stroke water cooled, wheels 15” and smaller: 65cc max
      • 2-stroke water cooled, wheels larger than 15”, original frame was not street legal (GP bike): 70cc max
      • 2-stroke water cooled, wheels larger than 15”, street-legal based frame (i.e. Aprilia RS50, Derbi, etc.): 75cc max
      • 4-stroke 4-valve air cooled: 160cc max
      • 4-stroke 2-valve air cooled: 175cc max
      • 4 stroke water cooled: 125cc max


  • Unlimited modifications.
  • Displacement limits:
      • 230cc or less for air- or air-oil cooled two-valve four-stroke engines.
      • 190cc or less for air- or air-oil cooled four-valve four-stroke engines. Displacement limits for Daytona 4V engines specifically are increased to 215cc if using a stock head, stock cam, stock ignition, modified stock airbox, and the motorcycle was originally sold with knobby tires.
      • 150cc or less for water-cooled four stroke engines.
      • 95cc or less for water-cooled two-stroke engines.
      • 125cc or less for air-cooled two-stroke engines.

Displacement limits may be extended on a case-by-case basis if total power does not exceed 25HP as certified by team testimony and/or dyno evidence. Exceptions will be revoked or penalized laps if unfair advantage is evident during the race. Contact race officials before race day to discuss exceptions.

For all classes:

Only commercially-available gasoline-based fuels are permitted. Ethanol blends up to E85 are permitted. Nitromethane and methanol fuels are not permitted.

No forced induction is permitted.

No external chemical power enhancement (i.e. nitrous) is permitted.