4045M08700 Wiseco Std Piston Kit for Yamaha TT500 XT500 1976-1981 87mm 10:1

Wiseco Std Piston Kit for Yamaha TT500 & XT500

This Wiseco Std piston kit (87 mm, 10:1 compression, part 4045M08700) is a standard-bore replacement piston assembly built to restore compression and performance in Yamaha TT500 and XT500 engines.

Overview

This Wiseco Std piston kit for Yamaha TT500 and XT500 models is an 87 mm standard-bore piston with a 10:1 compression ratio, referenced under part number 4045M08700. The piston kit for Yamaha TT500 and XT500 engines suits riders and rebuilders who want a stock-bore refresh without machining the cylinder oversize. Using the 87 mm Wiseco piston kit for Yamaha TT500 and XT500 rebuilds provides a forged component aimed at these classic single-cylinder engines.

Built For Performance

• 87 mm standard bore size, no overbore required
• 10:1 compression ratio for factory-style power delivery
• Wiseco forged piston construction for strength and heat resistance
• Part number 4045M08700 for easy identification
• Piston kit design for Yamaha TT500 and XT500 top-end service

Fits These Machines

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

On-The-Job Use

• Standard-bore top-end rebuilds keeping the original cylinder size
• Refreshing compression on high-hour Yamaha thumpers
• Trail, dirt, and vintage off-road riding
• Routine engine service on TT500 and XT500 machines

Specs At A Glance

Good To Know

Q: Is any cylinder boring needed for this kit? A: No, this is a standard 87 mm bore piston, so it is intended for a cylinder already at the stock bore in good condition.

Q: Can I install this piston without checking clearances? A: Always measure piston-to-cylinder clearance and ring end gap before assembly, since wear can affect the correct fit.

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