SuperNats XXI


2018 Pro Tour


PKC California


PKC Texas

2018 TBA

PKC Maui


Can-Am PKC

2018 TBA

California PKC Info

California PKC Sponsors


SuperNats PPEP

SKUSA Partners



California ProKart Challenge

Round 2 - Mar 31-Apr 1, 2017 - Streets of Willow


Race pre-entries may be submitted at a “packaged-price” discount through If you have any questions, email  This e-mail address is being protected from spambots. You need JavaScript enabled to view it or call 951-491-0808 for assistance.  NOTE: If you had a SKUSA membership in the past few years, you already have an account set up in MotorsportReg.

Pre-Entry – Enter Before the Cut-Off and Save!
The definition of a “PRE-ENTRY” is an entry received, with payment, at the ProKart Challenge office before midnight on the Monday prior to the event, and will qualify for the pre-entry pricing. Entries after this cut-off will have to be submitted at the event (starting Thursday afternoon 3-6pm, or Friday morning starting at 7:00am) at walk-up pricing.  See pricing below.  All race pre-entries will be confirmed via email within 2 business day of receipt at the PKC/SKUSA home office.  If you do not receive an email confirmation within 48 hours, please call 951-491-0808 to confirm that your entry has been received and is in process.

Pre-Entry closes at Midnight on Monday, March 27th, Anyone wanting to register for the race or Friday's practice after that time will have to sign-up at the track on Thursday, 3-6pm, Friday or Saturday starting at 6:30am. 

Capped Entries - Enter Early - Don’t Miss Out!
All classes will have a maximum amount of 40 entries per race.  Entries received after a particular class is filled will be placed on a waiting list and held pending cancellation openings.  Entrants will be notified directly of any change in status or availability and offered entry on a first paid, first served basis

Entry Fees
(NOTE: $325 Entry+Tires pricing is available on

ALL CLASSES (active SKUSA membership required for race days):
  • $100 Practice Day (STREETS OF WILLOW ONLY)
  • $125 Pre-Entry Race Fees
  • $160 Post-Entry / At Track Race Fees
  • $20 Transponder Rental ( If you don't have your own )
  • $222+tax per set Evinco-M ‘Red’ practice or race tires (for all classes except Mini/Micro Swift). These tires may be re-used from event to event. Practice or race tires for Mini/Micro Swift (Evinco-H ‘Blue’) are $211+tax. All tires can be picked up at the track or shipped ahead of time for $10 Shipping and Handling (within CA) or $15 (outside CA).
    Note: Race Tires MUST have the special PKC stamp to pass tech.
  • $100 SKUSA Annual Membership (must be current member)
  • $40 Reserved Pit Space (15' x 30' and 15' x 40')
  • $50 Overnight Camping (in your pit spot)
  • $100 RV Spot.  (no hook ups) SOLD OUT 3/23 – purchase a pit spot AND Overnight Camping and we will find you space in the pits
  • $15 for 1-day or $25 for 2-day CREW / MECHANICS passes only – for those people wanting access to the hot pit/grid/tech/scales. Spectators do NOT have to purchase pit passes for this event, as long as they stay out of the grid (and other restricted) areas.
  • NOTE: SKUSA’s Spec Fuel (C12 for all classes) and Spec Oil (Motul 2T Grand Prix) are mandatory at this event, but are not available to purchase from PKC/SKUSA. Please make arrangements to get some from your local kart shop or team for this event.

Driver Age
As ALL driver’s ages must be verified, you must email to This e-mail address is being protected from spambots. You need JavaScript enabled to view it or fax to (951) 491-0809 a copy of his/her birth certificate with the application for a SKUSA membership/racing license. Be sure to check the Classes section of this site or sections 15.3 and 20.1.2 of the SKUSA Rulebook for minimum age requirements of each class.


Willow Springs
3500 75th Street West
Rosamond, CA 93560

WSIR Hosted Practice on Friday, March 24th
Willow Spring is hosting a test and tune day on March 24th and will be running the same configurations and direction as our PKC race.  The testing/practice fee is $100 but you must also have a Universal Membership ($75).  Please call Autumn Soriano at the number above for more information.  The first session is at 8:00am, and the last, 4:30pm.  Full Schedule

Map And Directions ( Google Maps )

GATE HOURS: Streets of Willow gate hours will be: Monday-Wednesday track closed, Thursday 3/30 7am-10pm (MOVE-IN/SETUP/CHECK-IN ONLY -- NO PRACTICE), Friday 3/31 and Saturday 4/1 6:30am-11pm, and Sunday 4/2 6:30am-noon. Overnight campers must be inside the gates by closing time each night or risk being locked out. See Schedule details.

Overnight Parking, Pit Spots and Camping
PKC has arranged for overnight parking of trailers, as well as overnight camping on site, starting Thursday, March 30th. Although there are two sizes of pit spots for this event, each reserved pit spot is $40; there are 15’x30’ and 15’x40’ spots. if you are camping overnight in your pit spot, the charge is $50 as a flat fee for up to 3 total nights – in addition to the cost of your pit spot. If you wish to reserve a pit spot, purchase it here. If you are going to camp in your sleeper trailer in your pit, please also pay the camping fee here. (Only sleeper trailers are allowed in the pit spot rows. See info below for RV spot locations and pricing.) Be sure to list your top 3 choices for each pit, RV or camping spot. We will contact you to confirm your reservations and add you to the map.

RV Parking
Update 3/23 : Since the RV spots have sold out for Streets of Willow, we are now allowing RV's in the pits, but you must purchase enough pit spots and the Camping Fee to accommodate it.

Note: Any RVs or large Rigs with landing gear MUST use pavement protection to prevent damage. Otherwise, charges will apply.

There are only (6) RV spots available at this time, and they are approximately 20' x 60'. These spots have no hook-ups and are first come first served (SOLD OUT)

Clutch Gear Allowed for Willow Springs Event
We have had many questions regarding the clutch gear for the PKC event at the Streets of Willow track. To clarify the rules (which have been published in the pdf for each engine):
  • SWIFT 10 or 11 tooth
  • X30 10,11,12,13 tooth
Rear gear is open.

Pets On Premises
Dogs are allowed on the kart track premises, but must be kept on a leash at all times. No dogs allowed on grid. Please pick up after your pet.

Reserved and Unreserved Pit Spaces
An unreserved pit space is included at no charge with your race entry. However, the location of unreserved spaces is determined on a first arrive, first serve basis with no ability to choose a location or pit neighbor. As a result, you could arrive at “dark-30″ on Friday morning and still be a football field from the pre-grid or worse yet, you can’t get to the event until Saturday. Therefore, we have provided the ability to pre-reserve a pit space(s). In this manner, you choose the space you want now and that space will be available whenever you arrive. There is labor required to administrate pit space reservations, so a cost is involved. However, you will hopefully view the nominal $40/space charge as well worth it.

Reservation Instructions
Team Managers with block requests or those that need an irregular sized pit space, should call (951) 491-0808 or email This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
Reserve your Pit Space now in the Online Store

Spectator Tickets – NOT Needed, unless you are a crew member or mechanic that needs access to the HOT PIT and/or TECH/SCALES areas.
1 and 2 day spectator passes are available through EventBrite and directly on the Spectator Pass page for this event. These passes include pit access, thus enriching the spectator experience through up close contact with the drivers and crew. Prices are $15 for a 1-day pass and $25 for a 2-day pass. Kids 5 and under are FREE, but everyone must sign an insurance waiver.

Willow Springs charges all attendees a $10 gate fee at the front entrance. Spectators will NOT have to purchase a separate pit pass from PKC at this event, as the gate fee covers their insurance wristband. Only mechanics and crew members that want access to the HOT PIT area of the track (and tech/scales) need to purchase PKC pit passes, in addition to paying the Willow Springs gate fee.

Course Map For This Event
CW Up the hill - Senior Layout: 1.6 Miles - Junior Layout: 1.1 Miles


As part of an overall effort to expedite driver check-in, we have eliminated the use of "Will Call" lists, although purchasing your tickets via EventBrite below serves the same purpose. A few things will help us help you.
  • If you know the name of your MECHANIC, include it on the ticket. Adding their email address will even send a copy directly to them.
  • If you don't know the name of your MECHANIC that's ok too, but you must send them a copy of their ticket, even a screenshot of the barcode via text will work.
  • We can check someone in manually, but verification could delay their entry so make every attempt to provide them with their ticket.

Parents, Guardians and Team Principles

If you need to check in a driver for age or language reasons AND NEED TO ASSIST THAT DRIVER ON THE GRID OR AT TECH/SCALES, you can still purchase a ticket below to be used at Driver Registration, but please keep the non-drivers to a minimum so we don't bog their line down. 


Thursday, March 30th – Move-in Day Only

7am-Gates Open for Move-In
2pm Tire Desk Open
3-6pm Pre-Tech and PKC Early-Bird Registration Open
10pm Pit Curfew/Gates Locked 

Note: Practice will NOT be allowed on track this day. 

Friday, March 31st - Practice Day 

6:30am Gates and Registration Open
7:00am-3:00pm Tire Desk Open
8:00am MANDATORY DRIVERS’ MEETING – with MANDATORY PRE-TECH directly following
9:00am-5:00pm Practice by sessions: Mini/Micro Swift (shortened track), X30 Juniors (shortened track), X30 Seniors
& Masters, all Shifters. NOTE: All drivers will need to go thru Pre-Tech and Race Director sign-off prior to taking the track for their first practice session of the day.
11:00pm Pit Curfew/Gates Locked

Saturday, April 1st - Race Day

6:30am -- Gates and Registration Open 
7:00am –12:00 noon -- Tire Desk and Pre-Tech Open
7:00am – Pre-Tech open

Practice -- 10 minute sessions 
7:30am  Mini & Micro Swift (shortened track)
7:45am  X30 Junior (shortened track)
8:00am  X30 Senior & Master
8:15am All Shifters

8:30am  Mini & Micro Swift (shortened track)
8:45am  X30 Junior (shortened track)
9:00am  X30 Senior & Master
9:15am All Shifters
9:40am -- Drivers’ Meeting at SKUSA trailer – with final MANDATORY PRE-TECH directly following (for any drivers not already signed off)

Qualify -- 10 minute sessions 
10:30am  Mini & Micro Swift (shortened track)
10:50am  X30 Junior (shortened track)
11:10am  X30 Senior & Master
11:30am All Shifters

20-Minute Lunch Break

Heat1 -- 10 Laps (Mini/Micro 8 Laps)
12:10pm  Mini & Micro Swift (shortened track)
12:30pm  X30 Junior (shortened track)
12:50pm  X30 Senior & Master
1:10pm All Shifters

Heat2 -- 10 Laps  (Mini/Micro 8 Laps)
1:30pm  Mini & Micro Swift (shortened track)
1:50pm  X30 Junior (shortened track)
2:10pm  X30 Senior & Master
2:30pm All Shifters

Main -- 16 Laps  (Mini/Micro 12 Laps)
2:50pm  Mini & Micro Swift (shortened track)
3:15pm  X30 Junior (shortened track)
3:45pm  X30 Senior & Master
4:15pm All Shifters

Podium Presentations and Raffle to Follow Final Tech Inspection

11:00pm Pit Curfew/Gates Locked

Sunday, April 2nd – Move-Out Only

6:30am -- Gates Open
NOTE: Another race organization starts on track at 8am. Everyone needs to be out of the area around Concessions, Registration and the Grid by 6:30am. 10am is deadline for all karters to be offsite.


SKUSA is no longer recommending or booking group discounts from event to event. We have, however, partnered with Choice Hotels to offer a corporate discount which is outlined below.


Choice Hotels Corporate Discount

SuperKarts! USA has partnered with Choice Hotels to offer our competitors a 15% Corporate Discount at over 6,300 hotels worldwide.  This will be active all season.

Note: You must book via the link below, or by calling the below number and providing them our Corp ID.  You cannot get this rate by calling any of the hotels direct.

Online Booking | (877) 424-6423 | Corporate ID 0049450



Cancellation/Refund Policy

Please read our Terms and Conditions page.

Pit Space Rules

  • Space reservations are on a first paid, first served basis
  • Unreserved spaces are on a first arrive, first served basis
  • All equipment must fit within your designated pit space. This includes: trailer; tents, karts, generators, pit carts, etc.
  • All vehicles (tow and otherwise) must be stored/parked in the participant parking area North of the pit area.
  • Other than rare exceptions, Motorhomes are prohibited in the main paddock and must be parked in the designated RV area. Overnight vehicles that ARE allowed in the main pit area are trailers or vehicles used to store and transport karts (i.e., toy boxes, fun movers, etc.)
    NOTE: If you are camping on-site overnight, you will need to pay a $50 camping fee, either thru the online shopping kart, or at the track on Friday night.
  • Pit space move-in starts on the Thursday afternoon prior to an event.
  • PLAN YOUR SPACE CAREFULLY — You are able to reserve a specific location(s) based on current availability.  If your space requirements subsequently change, you will be moved to the first available area that meets the new specification - which may not be anywhere near the original location. Pit space reservation priority is based on the receipt date of the location request AND payment (no payment, no reservation).