Namura Standard Bore Size B 47.45mm Piston Kit for Yamaha YZ85 2002-2023 47.5mm

Standard Bore Size B 47.45mm Piston Kit for Yamaha YZ85 2002-2023

This Namura piston kit is a direct replacement for the Yamaha YZ85 two-stroke engine, delivering a precise 47.45mm bore size to restore compression and performance. Designed as a standard bore piston kit, it matches OEM specifications for a seamless rebuild.

Overview

The Namura Standard Bore Size B 47.45mm Piston Kit is a complete replacement assembly for the Yamaha YZ85 from 2002 through 2023. This piston kit ensures reliable power output and proper cylinder clearance, making it a direct fit for standard-bore engines. Whether you are rebuilding a top end or refreshing an older machine, this piston kit provides the exact dimensions needed for the YZ85.

Built For Performance

• Precision-machined from high-silicone aluminum alloy for thermal stability and strength
• Includes piston, piston rings, wrist pin, and circlips for a complete top-end set
• Chrome-plated top ring reduces friction and extends ring life
• Matched to stock bore clearance for reliable cold start and warm-up

Fits These Machines

• for Yamaha YZ85 (2002-2023)

On-The-Job Use

• Motocross racing
• Off-road trail riding
• Enduro and hare scramble events

Specs At A Glance

Good To Know

Q: Will this piston kit fit my 2015 Yamaha YZ85? A: Yes, the kit is designed for all YZ85 models from 2002 to 2023, but always confirm your engine serial number before ordering to ensure compatibility.

Q: Does the kit include wrist pin bearings or only the pin? A: The kit contains the piston, rings, wrist pin, and circlips; wrist pin bearings are not included and should be sourced separately if needed.

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