Dirt Bikes

Tomasin Racing T500 Engine Kit for 2026 KTM First Look

A 2023–2026 KTM 450 SX-F can become a fuel-injected 500cc two-stroke with this product from Italy.

December 22, 2025

KTM has a trio of two-stroke motocross bikes for 2026 including the 125 SX, 250 SX, and 300 SX. The Austrian manufacturer (like all other major motorcycle brands) doesn’t offer a 500cc two-stroke, which presents an opportunity for other businesses to step in and create one.

If your 2023–2026 KTM 450 SX-F is destined to become a 500 SX, Tomasin Racing can help you accomplish that with its T500 Engine Kit, which costs 8500 euros ($9966).Tomasin Racing

Enter Tomasin Racing. The Italian company is most known for turning 2021–2026 Honda CRF450Rs and CRF450RXs into CR500Rs, and now it’s expanded its product lineup to include a T500 Engine Kit that transforms 2023–2026 KTM 450 SX-Fs into a 500cc two-stroke. If KTM made such a model, it would probably be called 500 SX.

Tomasin Racing offers its T500 Engine Kit for 2023–2026 KTM 450 SX-Fs for 8500 euros ($9966). Consumers can also purchase the bike as a whole—a 2026 KTM 450 SX-F with T500 Engine Kit installed for 17,500 euros ($20,517).

Another option is buying it as an entire bike: a 2026 KTM 450 SX-F with T500 Engine Kit installed by Tomasin Racing for 17,500 euros ($20,517).Tomasin Racing

Check out tomasinracing.net for more information about its products and pricing.