393M06500 Wiseco Piston Kit .040 for Yamaha RD350 RD400 1973-1979 65.00mm

Wiseco Piston Kit for Yamaha RD350 & RD400

This Wiseco .040 piston kit for Yamaha RD350 and RD400 models delivers a 65.00 mm bore size, cross-referencing OEM number 393M06500 for a precise replacement fit.

Overview

This Wiseco piston kit for Yamaha RD350 and RD400 twins is a 65.00 mm oversize rebuild component that restores compression and cylinder sealing on worn top ends. The .040 piston kit for Yamaha RD350 and RD400 engines suits riders rebuilding a tired motor or refreshing a race build. Each kit is sized to OEM cross-reference 393M06500.

Built For Performance

• Forged piston construction for high-compression two-stroke use
• 65.00 mm bore size, .040 oversize for worn or bored cylinders
• OEM cross-reference 393M06500 for easy part matching
• Designed for Yamaha RD350 and RD400 air-cooled twins, 1973-1979
• Kit format includes piston and matched components for a rebuild

Fits These Machines

• for Yamaha RD350 1973-1979
• for Yamaha RD400 1976-1979

On-The-Job Use

• Top-end rebuilds on worn RD350 and RD400 cylinders
• Bored-over engines needing a matched oversize piston
• Vintage two-stroke restoration and refresh projects
• Race and street builds requiring a precise bore match

Specs At A Glance

Good To Know

Q: Is this piston kit an original Yamaha part? A: No, it is a Wiseco piston kit for Yamaha RD350 and RD400 models and is not an original Yamaha product.

Q: Will the .040 size fit my stock cylinder? A: A 65.00 mm oversize piston requires the cylinder to be bored and honed to match, so confirm your bore measurement before ordering.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.