The ‘Duffy’ is the most prestigious trophy in grassroots kart racing, and once a year the International Kart Federation holds its annual IKF Sprint GrandNationals. The names who call themselves Duffy winners are a who’s who of motorsports and the distinction of being an IKF national champion solidifies any racer’s legacy in the sport.
DATE: October 3-5, 2025
VENUE: K1 Circuit, Winchester Ca
PRE-ENTRY: Open NOW (closes Sept 29 at 11:59 PM PDT)
Event Schedule // Pit Spot Reservations // Pit Passes // Track Map
Race Classes
IAME Engines will use current SKUSA Rules.
Micro Swift (7-10*)Sponsored by Leading Edge Motorsports
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206 Cadet (7-13*)Sponsored by HRT Driver Development
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Mini Swift (9-13*)Sponsored by SuperSpeed Bearings
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206 Junior (12-15*)Sponsored by Nash Motorsports
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KA100 Junior (12-15*)Sponsored by Mega Power Engines
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206 Senior (15+)Sponsored by Formula Works
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KA100 Senior (15+)Sponsored by Precision Works Racing Engines
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206 Master (30+)Sponsored by Precision Karting
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KA100 Master (21+//30+)
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*All drivers 12yo and under must wear a Neck brace & SFI-approved chest protector.
Race Fuel/Oil
- 206: Sunoco 91 Unleaded pumped at track directly from Sunoco dealer.
- All other 2-stroke classes: Sunoco / Elf HTX909
Tire Information
- ALL event tires are Evinco, including practice.
- All classes must use same tires for the duration of event (all competition sessions).
- Rain tires must be MG only.