The 2021 Estenson Racing Yamaha MT-07 DT is a one-of-a-kind racer specific to American Flat Track racing. Designed around Yamaha’s MT-07 production engine, the prototype flat track machine was originally developed in house by Yamaha Motor Corporation, USA (YMUS).
In 2019, Estenson Racing took the project to the track and achieved early success, scoring a pair of wins on the TT tracks with JD Beach, including the brands’ first win in the Twins class since Scott Pearson in 1981.
American Flat Track’s AFT SuperTwins rule book for production-based engines allows for up to 900cc and requires that the original engine cases, cylinders and heads are used, but porting, machining and modification is permitted. Starting with the MT-07’s original displacement, the team runs different engine displacements – between 700cc and 738cc – depending on the track. The rules also allow for changes to the crank, rods, pistons, valves, cam shafts and clutch.
With the arrival of flat track racing’s modern era machines, electronics are now a part of the sport. Adjustments to fuel and spark maps, performance strategies and data collection are allowed, but traction control is still not permitted. Chassis wise, the frames are prototypes specific to flat track racing, either steel or aluminum for both the frames and swingarms. Suspension is open to anything commercially available and the minimum weight for each SuperTwins machine is set at 310 pounds.
With increased support from YMUS since 2020, Estenson Racing continues to develop the MT-07 DT and looks to battle for top honors in American Flat Track’s premier class.