YZF-WRF Piston Rings 250 4T 01-04

YZF-WRF Piston Rings 250 4T 01-04

The YZF-WRF Piston Rings 250 4T 01-04 are a piston ring set for Yamaha 250 cc 4-stroke engines, matching the standard 77.00 mm bore used on YZ250F and WR250F models from 2001 to 2004. This set restores correct sealing and compression when used with OEM or ProX-type pistons in these engines.

Technical specifications

• Engine type: 4-stroke
• Displacement class: 250 cc
• Bore diameter: 77.00 mm (standard)
• Application models: Yamaha YZ250F / WR250F 250 4T 01-04
• Piston compatibility: OEM and ProX-type pistons for 77.00 mm bore

Use context

Use this piston ring set when rebuilding the top end to address loss of compression, increased oil consumption, or blow-by on Yamaha YZ250F and WR250F engines from 2001–2004. It is typically replaced together with the piston, pin, and circlips as part of a complete top-end refresh.

Installation

This piston ring set installs as a direct fit for the specified 77.00 mm bore pistons; follow the Yamaha service manual or piston manufacturer data for ring end-gap checks, ring orientation, and cylinder condition before assembly, using appropriate measuring tools and torque values.