Yamaha Bearing Cyl. #17 - 93317-21236-00. High-Quality Bearing for Optimal Performance. The Yamaha Bearing Cyl. #17 - 93317-21236-00 is a crucial component designed to maintain the efficiency and performance of your Yamaha engine. This durable bearing ensures smooth and reliable operation of the cylinder, reducing friction and wear, which ultimately extends the lifespan of your engine's moving parts. Whether you're performing maintenance or replacing a worn part, this bearing will keep your engi