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

The Yamaha 70-402-1K Driveline Rebuild Kit restores worn driveline components in Yamaha WaveRunner and jet boat propulsion systems, delivering reliable torque transfer from the engine to the jet pump. This aftermarket kit is designed to be equivalent to OEM components and typically contains bearings, seals, O-rings, and, depending on the kit version, couplers and related hardware. Materials include steel bearings, rubber seals, and composite components, and the kit is used during full driveline service or rebuild to maintain alignment, reduce vibration, and extend drivetrain life under high-load marine conditions. Compatibility spans Yamaha marine propulsion driveline systems, with model-specific fitment required, and it is commonly employed during maintenance and overhauls to restore power transmission. Common replacements include Yamaha 68N-45593-00-94 Coupler Flange, Yamaha 66V-51323-00-00 Bearing Housing, and Yamaha 6R8-51323-00-00 Driveshaft Bearing to support driveline alignment and component interchange. Part number 70-402-1K identifies this aftermarket driveline rebuild kit, which serves to restore driveline components for reliable torque transfer in marine propulsion and jet drive systems.