Yamaha 70-402-1K Jet Drive Driveline Rebuild Kit

Description:

The Yamaha 70-402-1K Driveline Rebuild Kit is a drivetrain service kit used in marine propulsion and jet drive systems. Commonly installed in Yamaha WaveRunner and jet boat driveline assemblies to restore worn internal components such as bearings, seals, and couplers. Maintenance teams and marine technicians use this kit for repair, overhaul, and full driveline rebuild applications to ensure smooth power transmission.

Applications:

The Yamaha 70-402-1K Driveline Rebuild Kit is used in Yamaha marine propulsion systems where reliable torque transfer between the engine and jet pump is critical. It is commonly found in Yamaha WaveRunner and jet boat platforms, supporting driveline assemblies that connect the engine output shaft to the pump system. This kit is essential during major service intervals or failure repairs, ensuring proper alignment, reduced vibration, and extended drivetrain life under high-load marine conditions.

Technical Specifications:

• Brand: Yamaha (aftermarket kit reference 70-402-1K)
• Part Number: 70-402-1K
• Product Type: Driveline rebuild kit
• Function: Restores driveline components for power transmission
• Application: Marine propulsion / jet drive system
• Kit Contents: Bearings, seals, O-rings, possibly couplers and hardware (kit-dependent)
• Fitment: Yamaha WaveRunner and jet boat driveline systems (model-specific compatibility required)
• Material: Mixed components (steel bearings, rubber seals, composite materials)
• System Role: Maintains alignment, reduces vibration, and ensures torque transfer
• Installation: Used during full driveline service or rebuild
• OEM Status: Aftermarket rebuild kit equivalent to OEM components

Common Replacements:

• Yamaha 68N-45593-00-94 Coupler Flange
• Yamaha 66V-51323-00-00 Bearing Housing
• Yamaha 6R8-51323-00-00 Driveshaft Bearing