Yamaha part number 90890‑01430-00 refers to a genuine Yamaha ring‑nut wrench used for middle‑drive gear and bearing‑retainer service on models like the Rhino and Grizzly.
Used to torque/tighten to spec part number 26 (spanner nut 90179-55660-00) as shown on parts drawing in pics above
Fitment & Usage Notes
Used on Yamaha middle‑drive gear assemblies (Rhino 660/700, Grizzly, Big Bear, etc.).
Some owners fabricate their own tool, but the OEM wrench is recommended for proper tooth engagement and to avoid case damage.
Also useful on Benneche, Coleman, HISUN, Massimo, and Cub Cadet side by sides etc.