Yamaha 90179-34304-00 Middle Drive Gear Special Shape Nut

Description:

The Yamaha 90179-34304-00 Middle Drive Gear Special Shape Nut is a precision locking nut used in Yamaha drivetrain middle drive gear assemblies. Commonly installed in Yamaha motorcycle shaft drive systems such as XJ650 and XJ750 models within middle gear housings. Maintenance teams and mechanics use this part for drivetrain repair, gear retention, or OEM replacement during engine and transmission servicing.

Applications:

THE YAMAHA special shape nut is used in middle drive gear assemblies to secure drivetrain components such as gears, cams, and shafts under rotational load. It is commonly found in Yamaha motorcycles with shaft drive systems used in road transport, mechanical servicing environments, and restoration projects where maintaining proper gear alignment and torque retention is critical.

Technical Specifications:

• Brand: Yamaha
• Part Number: 90179-34304-00
• Product Type: Special Shape Nut / Locking Nut
• Function: Secures middle drive gear components under load
• System Type: Shaft drive / middle gear drivetrain assembly
• Application Area: Engine drivetrain housing
• Design: Flanged / special shape for locking and torque retention
• Compatibility: Yamaha XJ650, XJ750, and similar shaft-drive motorcycles
• Mounting Role: Retains gears, cams, or shafts within drive assembly
• OEM Status: Genuine Yamaha part
• Availability: May be discontinued or limited supply

Common Replacements:

• Yamaha 90179-14317-00
• Yamaha 90179-12323-00
• Yamaha 90179-25495-00