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Next ProKart Challenge Event


Will close March 26th at 6am.

Round 2 - Streets of Willow March 30-31, 2018
Willow Springs
3500 75th Street West
Rosamond, CA 93560
(661) 256-6666
Google Maps

Event Bulletin Board

  • 3/15/18 - Our customers requested that we run the track CCW, but after reviewing all of the speed and safety issues that are created by running that direction, we have decided to run up the hill as we did last year.  
  • 3/14/18 - PRE-TECH is mandatory PRIOR to taking the track for your first practice session for this event (whether it be Friday or Saturday morning), and you MUST get a sticker from Tech showing you passed PRE-TECH
  • 3/9/18 - Track direction updated to CCW, "down the hill"

 Important News

SuperNats 14 Event and Competition Schedule Updated
Sunday, 14 November 2010 20:20
Please see the Event Format and Schedule page for the updated Event and Competition (On Track) schedules.

SKUSA Registration will be open Monday from Noon to 6pm and Tuesday from 8am to 6pm in the Rotunda (rear lobby of the Rio) for check-in.
Vortex Mini ROK Corrections, Clarifications and Reminders
Friday, 12 November 2010 18:41
  • Air box:  The correct dimensions for the air box tube are diameter = 22mm+/-1mm;  length = 95mm+/-1mm.
  • Cylinder length = 71.55mm +/-.3mm (Not posted on the 2010 pdf.)
  • All class participants, including Vortex-supplied engines:  Full chain/clutch cover required, such as OTK, KG or Tillett or billet clutch cover with chain cover strap.
Honda Racing Line Expands Into Karting
Thursday, 04 November 2010 12:16
Continuing its mission to meet the needs of grassroots competitors who are racing Honda products, Honda Performance Development, Inc., will begin offering Honda CR125 parts and engine-rebuild kits within the United States for competition in karting’s ‘Spec Honda’ class.

The rebuild kits and service parts will be available through the Honda Racing Line, HPD’s parts and service program for licensed amateur and entry-level professional racers. Licensed kart competitors may now register for the Honda Racing Line through

The Honda Racing Line provides its members with a direct connection to Honda Performance Development and its unparalleled record of success at the pinnacle levels of motorsport, including the IZOD IndyCar Series and American Le Mans Series. This channel to factory support provides Honda Racing Line members the opportunity to purchase racing-performance parts via convenient web-based ordering, with expedited, door-to-door delivery.
Stock Honda Carburetor Additional Information
Written by John Motley - National Technical Director   
Thursday, 28 October 2010 17:00
On September 7, 2010 we posted information regarding the carburetors allowed in Stock Honda classes.  These regulations took effect October 1, 2010.
The maximum bore size was inadvertently left off which has remained unchanged at 38.6mm.
In addition,we have now posted in the Rule Book Section under Rules Updates pictures of the allowed carburetors as well as unacceptable models that have raised questions.
More classes sell out as SKUSA hits record number of entries for Supernats 14! Important Deadlines Approaching!
Thursday, 21 October 2010 18:41
The SKUSA office is crazy busy, as entries have now surpassed 460 -- by far the largest entry count ever in the history of this event! The following classes are SOLD OUT, with the wait lists hitting double-digits: TaG Cadet, TaG Senior, TaG Master, and S2. There are 2 more classes on the verge of selling out: KZ2 and G1. The classes with room still available for those procrastinators: KF2, S1, S4, S5 and TaG Junior.
Deadlines Approaching: The pre-registration cutoff for this event is SUNDAY, OCTOBER 31ST, at midnight. Any interested racers that miss this deadline will have to pay an extra $200 walk-up fee to register at the track -- and that's if there is still room to run in the desired class. Oct. 31st is also the last day for anyone wishing to cancel their entry to notify SKUSA and still get a refund on their paid entry fees.

Practice Tires: For drivers and teams wanting to pre-order and/or pre-purchase practice tires -- the same practice tires that the drivers will be racing on in Vegas -- you will want to get those ordered NOW to guarantee their availability at the track! Either free delivery to the track or shipping at cost (within the continental US), the deadline to order is Friday, November 5th. Individual sets may be purchased thru the online shopping kart by clicking HERE by October 31st. Teams wishing to pre-purchase or pre-order multiple sets, or drivers wishing to pre-order their practice tires for pickup and payment at the track, please call the SKUSA office at 951-491-0808 or email This e-mail address is being protected from spambots. You need JavaScript enabled to view it by Friday, Nov. 5th. 


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