Daily Grind: Dirt Rider rebuilds a YZ250 two-stroke motor

As everyone who has ever driven any sort of motor vehicle knows, engines eventually fail. For the folks over at Dirt Rider, their most recent engine fail came at the hands of a YZ250 two-stroke motor. “It made dreaded noises and came to skidding stop in the middle of the California desert. We feared catastrophic failure, but in the end it was simply roasted crank bearings. We contacted Hot Rods (www.hotrodsproducts.com) and ordered up a bottom kit, which comes with the crankshaft, main bearings and seals and a complete gasket set. It also included a Vertex piston and rings. We sent the cylinder off to Millennium Technologies for a re-plate (www.mt-llc.com),” they wrote. To look at their step-by-step guide to how they rebuilt the motor, click here.

Photo courtesy Dirt Rider