Woltjer Yamaha KT100
The Woltjer Yamaha, a national championship winning engine for over three decades

Woltjer Racing Engines is a 2-cycle kart racing engine builder owned by the Woltjer family and located in Broken Arrow, Oklahoma. We’ve built and maintained championship-winning engines since 1988 and currently specialize in the most popular 2-cycle engine platforms in the United States, including the IAME X30, Parilla Leopard and Mini Swift TaG engines, the Yamaha KT100 and the Vortex Mini Rok.

We offer trackside support at many of the top national sprint karting series that feature these engines in their class structures, including the SKUSA Pro Tour, WKA Manufacturers Cup and United States Pro Kart Series (USPKS).

Since 1988 we’ve been committed to building the best performing, finest quality engines for our customers. We’re continually researching, testing and working to make more horsepower. Every engine that leaves our shop has been inspected, built and assembled as methodically and flawlessly as the previous one including the necessary dyno testing to ensure peak performance when it hits the racetrack.

The Family Behind the Name

Daniel Woltjer

Daniel grew up in California and began racing go-karts in 1988. He won his first “Duffy” championship in the International Kart Federation (IKF) in 1990, and spent his younger years racing karts and working on engines with his father, Carl. Daniel spent a number of years working for RLV Tuned Exhaust Products in California before relocating to Oklahoma and working full time in the engine business.

Daniel is married to Alisa, who also works in the business, and while not building engines and supporting customers at karting events they keep busy with their four daughters.

Gary Woltjer

Gary started racing go-karts in 1989 at the age of 11. Some major accomplishments as a driver include:

  • 1989 SMKA Champion
  • 1992 California State Champion
  • 1993 Region 7 Champion
  • 1993/1994 back-to-back IKF Grand National Champion

Carl Woltjer

Carl began working on small engines in 1964 when he owned and operated a lawn and garden equipment repair business.

In 1988, he bought a used go-kart for Daniel. Carl took apart the 4-cycle engine and saw numerous ways he believed would improve the engine’s performance, so he put those ideas into action and rebuilt the motor. Upon Daniel winning his second race others took notice and soon began asking Carl to rebuild their engines. Woltjer Racing Engines soon became a reality.

After building 4-cycle engines for several years, Gary began working with 2-cycle engines and traveling to the racing events to provide trackside support for customers.

Carl has worked one-on-one with many notable karting champions, including Paul Edwards, Jesse Boyd, the Buhr Family, Patrick Long, Phillip Giebler, Rocky Moran Jr., Danica Patrick, Tony and James Bruncati, Tim O’Brien.

Carl is now enjoying a well-deserved retirement.