Dynamic Engine Factory

04/27/2026

04/27/2026

Slacking on social media lately, but we are getting back to showing you all the different things we're into here! From Pro sx/mx engines, 3d printing parts, Drag race engines, custom cranks, cams, pistons, cylinders, big bore kits, stroker kits, machine work, electronics and dyno tuning. We are truly DYNAMIC!

We are adding products and services weekly to our site! Buy and shop online for premium products and services! www.DEF-Racing.com

dragrace

04/23/2026

Order yours today at DEF-Racing.com 🛒📈

We do our best to keep all these custom race parts in stock and ready for fast shipping. 📦 🚐

Thanks for everyone’s recent and past orders! We appreciate you!

03/09/2026

Everyone has been waiting for these. Now with an updated design and gas ports! We spent a ton of time developing this latest iteration and it's an absolute killer! Super durable, long life and great performance. 🔥 Thanks for everyone's patience! Get them on DEF-RACING.COM before they are gone!

02/20/2026

23-26 YZ450 - DEF Racing Dual injector Kit. The 2026 model has some changes and the new map is now ready! In stock on the website. This bike is NaSty with this!

10/20/2025

Love what we do for a living. Go fast parts for motorbikes. Pretty cool. Thanks to all our of customers trusting us to keep making you go fast year after year. 🙏

10/16/2025

Fresher than a peppermint! ✨

09/03/2025

Our custom +2mm long rod Yamaha Y250F piston testing complete ✅ Big Power ✅ Easy Install ✅ In Stock Ready To Ship ✅

To take full advantage of a long rod setup you absolutely should get a proper dyno tune from a shop with capable skills to adjust the ignition and fuel tables. Due to the change in piston speed this is critical for getting maximum performance.

We keep getting asked, yes… we definitely sell to other shops and offer dealer pricing. Just reach out.

09/03/2025

We’re prepping another engine that will be racing in some of the upcoming events. We have all the same parts shown here on our website for sale. Dealer sales available too.

07/02/2025

2024-2025 Triumph TX250 - Dynamic Racing 15.8:1 High Compression Piston Kit. Engineered to provide significant power and torque gains over the stock piston, making it a great upgrade. Its drop-in design ensures easy installation and serviceability, and it works effectively in both stock and modified engines.

Description ALSO FITS: 2023-2025 Husqvarna FC 250 2024-2025 GasGas MC 250F Upgrade your KTM 250SXF’s performance with the Dynamic Racing 15.8:1 High Compression Piston Kit. This piston is engineered to provide significant power and torque gains over the stock piston, making it a great upgrade. Its...