4767M08750 Wiseco Piston Kit for Yamaha TT500 XT500 1976-1981 87.50mm 12:1 .020

Wiseco .020 Piston Kit for Yamaha TT500 & XT500

This Wiseco .020 piston kit is an 87.50 mm, 12:1 compression forged piston assembly for Yamaha TT500 and XT500 engines, cross-referenced to 4767M08750.

Overview

This Wiseco .020 piston kit delivers a forged 87.50 mm piston with a 12:1 compression ratio for Yamaha TT500 and XT500 engines produced from 1976 through 1981. The kit carries the Wiseco part number 4767M08750, giving riders and rebuilders a known reference for an oversize build. It suits engine builders and vintage off-road enthusiasts restoring or freshening a top end.

Built For Performance

• 87.50 mm piston diameter
• 12:1 compression ratio
• Wiseco forged piston construction
• .020 oversize bore
• Wiseco part number 4767M08750

Fits These Machines

• for Yamaha TT500 1976-1981
• for Yamaha XT500 1976-1981

On-The-Job Use

• Top end rebuilds on vintage four-stroke singles
• Bore freshening on worn cylinders
• Vintage trail and enduro engine builds

Specs At A Glance

Good To Know

Q: Does this kit include rings and pin? A: Piston kits of this type typically ship with rings, pin, and clips, but confirm the exact contents with the listing before ordering.

Q: Will the 12:1 ratio work with pump fuel? A: A 12:1 ratio generally calls for higher octane fuel than stock. Confirm your fuel and tuning setup before running this piston.

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