Two-stroke specialists Roy’s Rides now offers complete 2-stroke crankshaft rebuilding services along with complete 2-stroke motorcycle rebuilding, with an eye toward creating refurbished, one-of-a kind riders. Although mechanically simple, 2-stroke engines suffer over time from deteriorated crankshaft seals, which cause lean running and other issues that can lead to complete engine failure. Fewer and fewer shops are offering 2-stroke crankshaft rebuilding services, which is why Roy’s Rides started offering the service. Prices vary depending upon make and number of cylinders.