Yamaha KT100 specialists.

The "do everything" motor.

The Yamaha KT100 is used in a wide variety of classes throughout the world, and we have been blueprinting them since before MCR was founded. As with the Comer K80, the Yamaha KT100 needs specific attention to detail especially in the WKA Yamaha Junior Sportsman class. Reducing parasitic drag is very important in these motors. In the higher horsepower categories such as Yamaha Pipe or Formula Y the motors have different needs and your engine builder needs to understand what to do for each class. As with all our other motors, we spend a great deal of time ensuring that our Yamaha's are the best!

We also blueprint clutches, and if you want to run a Horstman or a Tomar clutch, we can do both.

Other engine builders do not spend this time on their motors! No doubt!


We pride ourselves in our craftsmanship and motors such as the K80 and Yamaha KT100 really respond to this atention to detail.

We can deliver a brand new motor or rebuild your current motor, just give us a call and let us know what you want!


Exploded View 1 Exploded View 2 Walbro WB-3A Walbro WA-55B
Case Crank Cylinder Electrical
  • 100cc 2-Cycle Engine
  • For various IKF and WKA classes
  • Type: 2-stroke, single cylinder, piston port
  • Bore x Stroke: 52 x 46 mm
  • Dry Weight: 21 lbs
  • Carburetor: Varied, Walbro WA-55B, Walboro WB-3A, etc
  • Ignition: TCI

For tuning information, please read our Technical Tips page.


MCR Engine Development
3161 Pegasus Drive
Bakersfield, CA. 93308
Phone: (661) 399-3580
Fax: (661) 399-3584