American Flat Track has released its list of approved engines for the 2025 season, and the FTR750 is not on it. With three rounds of the 16-race 2024 American Flat Track series left to compete, reigning champ, Jared Mees is leading the championship on an FTR750. Indian-mounted Brandon Robinson is in second, with KTM rider Briar Bauman very close behind, and Yamaha's Dallas Daniels just a handful of points behind in fourth.. If an Indian rider wins the 2024 title, the FTR750 will bow out undefeated in terms of championship wins.
This is the new AMA/AFT rule bulletin published in full.
2025 Approved AFT SuperTwins Engines, Updated 8/16/2024
The following list identifies all twin-cylinder engines approved for use in AFT Mission SuperTwins competition
Engines submitted for homologation approval in AFT SuperTwins must originate from production street motorcycles. If an engine's displacement is outside the class displacement limits in its original production form, it can still be submitted for homologation approval. Once approved, the engine must not exceed a displacement of 800cc for water-cooled engines or 900cc for air-cooled engines when used in competition.
Modifications to the engine's bore and stroke are allowed to ensure it meets these displacement limits.
Aprilia
• 990, V-Twin Aprilia-Rotax • 660 Parallel Twin
BMW
• 800 Parallel Twin, F-Series
Ducati
• 821 V-Twin Testastretta 11°: four-valve, liquid-cooled
• 937 V-Twin Testastretta 11°: four-valve, liquid-cooled
• 959 V-Twin Superquadro
Harley-Davidson
• 750 V-Twin, XG750R, 2015 - Current
• 750 V-Twin, Revolution X, XG750R 2017-Current
• 975 V-Twin, Revolution Max, 2022-Current
Honda
• 670 Parallel Twin
• 745 Parallel Twin (NC750X)
• 755 Parallel Twin (CB750, XL750)
• 998 Parallel Twin (CRF1000)
Husqvarna
• 890 Parallel Twin, 2022 - Current
Indian
• 983, V-Twin Scout 60
Kawasaki
• 649 Parallel Twin
KTM
• 950, 990, V-Twin LC8 (2003-2013)
• 799 Parallel Twin LC8c, 2018 - Current
• 890 Parallel Twin LC8c, 2020 - Current
Royal Enfield
• 650 Parallel Twin (2019-Current)
Suzuki
• 649 V-Twin (SV)
• 776 Parallel Twin (800DE, GSX-8S)
• 996 V-twin (1997-2007, TL, SV, DL)
Triumph
• 900 Parallel Twin, T100
• 865 Parallel Twin
Yamaha
• 689 Parallel Twin