Registration for 12 Hours of TCKC NOw Open!

NWMM is excited to bring our riders a special endurance event for 2023 - the NWMM 12-Hour Mini Endurance at Tri-City Kart Club! This will be our first race of 2023, our longest race ever, and will take place from noon to midnight on Saturday May 13 across multiple track configurations. We will have afternoon/evening practice on Friday May 12; exact hours are TBD but will be posted on our Endurance Schedule page as soon as they are confirmed.

To sign up for the 12-hour, see our Sign Up page for the MotorsportReg event link.

2023 Endurance Schedule

Our 2023 endurance schedule has arrived! See the Race Events section below for our confirmed endurance race dates. We've got a full 24 hours of endurance on the schedule again for this year, but we're changing up our format to keep things fresh for our veteran teams.

See our Facebook page or sign up for our mailing list to stay on top of all the news.

2023 Class and rulebook updates

Class and rulebook updates for 2023 have been made and published provisionally on our Rules page. Rule updates will be provisional to start with, and we will be open for feedback until February 24. We're making a few tweaks based on attendance from last year in terms of classes:

1. Sprint classes and day-of run groups will be changing to accommodate larger lightweight motorcycles such as 250/450 supermotos and street motorcycles up to 450cc, and to add lap time based bracket classes.

2. For endurance racing, the 150 Spec class will be folded into the Formula Middleweight class, and the Street 125 and Supersport classes will be folded into Formula 125 class, unless there is sufficient attendance to separate any of those classes back out (i.e. 4+ entries). Scooters will be run in the Formula 125 class.

3. Guaranteed endurance classes will be reduced to the following:

   • Formula 125 + Scooter

   • Formula Middleweight

   • Open

Other classes will be added back to the endurance based on sign-ups; at least 4 teams are needed per class to include them in the event.

Race EVENTS

ROUND 1: May 12 - 13 @ Tri City Kart Club (Richland, WA). Friday afternoon/evening practice, Saturday 1200-000 12H endurance race

ROUND 2: June 3-4 @ MAC Track (McMinnville, OR). Saturday practice + sprint races, Sunday 6H endurance.

ROUND 3: August 19-20 @ MAC Track (McMinnville, OR). Saturday practice + sprint races, Sunday 6H endurance.

SPRINT CHALLENGE DOUBLE HEADER: TBD @ MAC Track (McMinnville, OR). Saturday + Sunday practice and sprint races

Can I race my motorcycle?

Sure, if it's a minibike or scooter! It may or may not be competitive, but it'll be a lot of fun. Endurance races are restricted to just minis, but our sprint races held jointly with Oregon Lightweight Moto allow larger lightweight motorcycles.

Rules for scooters are more complicated, but all scooters should be able to find a class to race with NWMM.

Wondering what qualifies as a mini or a lightweight motorcycle? Maximum displacements for each are set by the Open Mini and Open classes, respectively.

Open Mini

• Unlimited chassis and engine modifications except as noted.

• Engine displacement limits:

  •  4-stroke 2-valve air- or air-oil cooled: 212cc

  •  4-stroke 4-valve air- or air-oil cooled: 190cc

  •  4-stroke water-cooled: 150cc

  •  2-stroke air-cooled: 125cc

  •  2-stroke water-cooled, no powervalve: 105cc

  •  2-stroke water-cooled with powervalve: 100cc

Open

The Open class is for any single- and twin-cylinder motorcycles under 650cc, with minimal restrictions. This class is intended for larger-displacement supermotos and multi-cylinder Sportbike or GP-framed motorcycles.

• Unlimited chassis and engine modifications except as noted.

• Engine displacement limits:

  • 700cc or less for four-stroke water-cooled single-cylinder engines.

  • 550cc or less for four-stroke water-cooled twin-cylinder engines.

  • 450cc or less for four-stroke water-cooled 3+ cylinder engines.

  • 500cc or less for water-cooled two-stroke single-cylinder engines.

  • 250cc or less for water-cooled two-stroke multi-cylinder engines.

  • 650cc or less for air-cooled engines.

The bikes:

See the Rules for details. We have multiple classes for scooters, mini GP bikes, mini motards, and mopeds. Typical entries into our classes would be:

Street 125:  Honda Grom, Kawasaki Z125 Pro, Kymco K-Pipe 125, SSR Razkull 125, Yamaha YSR80, Benelli TNT 135, Aprilia RS50 (stock).

Formula 125: Yamaha TTR-125 big wheel (disc brakes), Honda NSR50, Honda NSF100, Piranha SSR 125, Ohvale 110, Aprilia RS50 (modified), Kayo MR125, Honda CBR125, Kawasaki Z125. Honda XR100 with a 120cc kit and an XR80 front wheel, Yamaha TTR-125 small wheel (drum brakes), Yamaha YSR50, Honda XR50 with an 88cc kit and front forks with disc brakes.

Scooters: Vespa smallframe, Vespa largeframe, Lambretta series 1-4, Honda Elite, Yamaha BWS.

Formula Middleweight: Kawasaki KX65, KTM 65 SX, Honda CRF150F, Chinese YX-engined pitbikes with a 150cc-175cc 2-valve motor (SSR, Pirhana, etc), Ohvale 160, Kawasaki KLX-140, Vespa 100cc 2T scooter, Aprilia RS50 with an overbore, YCF SM F155

Open: Honda CRF150R, CR/YZ 85 up to 105cc (no powervalve), KTM SX/RM85/post-2019 YZ85 with up to 100cc overbore (powervalve), Kawasaki KX100, Ohvale 190, Daytona 190cc motors, 2-valve air cooled pit bikes up to 212cc, Honda CRF230, Yamaha XT250.

No bike? Not sure? No problem! See our Rentals page to find vendors who will rent you a mini for a session, an event, or the season!