Yamaha Motor Co., Ltd. 5NL-11633-00-00 Piston Wrist Pin

The Yamaha 5NL-11633-00-00 Piston Wrist Pin is a hardened-steel, engine-grade, precision-ground piston pin that connects the piston to the connecting rod and serves as the pivot for rotational movement in Yamaha motorcycle engines. Designed for YZ250F and WR250F models from 2001 through 2013, it is installed as a press-fit within the piston and connecting rod to withstand high-speed reciprocating and rotational loads while maintaining accurate piston articulation. The pin, construction-wise a precision-ground cylindrical component, supports reliable power transfer and engine durability under demanding, high-RPM operation. In maintenance and rebuild work, this wrist pin helps restore proper compression, articulation, and overall engine performance where wear has affected the piston-to-rod connection. OEM and aftermarket replacements are available, with common substitutes including Yamaha 5NL-11633-10-00, 5NL-11633-20-00, and Wiseco wrist pins compatible with the YZ250F.