232M08500 Wiseco Std Piston Kit for Yamaha DT400 MX400 1975-1978 85.00 mm

Wiseco Std Piston Kit for Yamaha DT400 & MX400

This Wiseco standard piston kit, part 232M08500, is a top-end replacement piston and ring assembly built to restore compression and performance with an 85.00 mm bore size.

Overview

This Wiseco piston kit is made for the Yamaha DT400 and MX400 from 1975 through 1978, giving you a fresh top end with an 85.00 mm standard bore piston. The kit is intended for riders and mechanics rebuilding a worn or seized engine and wanting dependable compression and durability from a trusted piston brand. If you are servicing a DT400 or MX400 top end, this Wiseco piston kit delivers the precision fit these vintage machines need.

Built For Performance

• Wiseco forged piston construction for strength and heat resistance
• Standard 85.00 mm bore size matches the original cylinder specification
• Kit includes piston, rings, wrist pin, and circlips for a complete top-end refresh
• Precision machining supports consistent ring seal and compression
• Designed specifically for the Yamaha DT400 and MX400 engine family
• Part number 232M08500 for easy reference and ordering

Fits These Machines

• for Yamaha DT400 1975-1978
• for Yamaha MX400 1975-1978

Good To Know

Q: What does the 85.00 mm size mean? A: It is the standard bore diameter, so it suits a cylinder that has not been bored oversize and is still within original specification. Q: Is this a complete top-end kit? A: It includes the piston, rings, wrist pin, and circlips needed for piston replacement, though gaskets and bearings may be sold separately.

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