Cylinder Works +3mm Big Bore Cylinder Kit for the 2014-2018 Yamaha YZ250F and 2015-2018 Yamaha WR250F increases displacement to 269cc. This direct bolt-on upgrade requires no re-plating and includes a matched Vertex piston for durability and performance.

Features

• Direct bolt-on installation with no additional machining required
• Nickel Silicon Carbide plated for extended lifespan
• Honed to exact size for easy piston installation
• Includes cylinder, piston, rings, pin, clips, and top-end gasket kit
• Big bore cylinder kits do not require additional machine work

Included Items

• Cylinder
• Piston
• Piston rod
• Two circlips
• Piston ring set

Gasket set, including:

• Base gasket
• Engine case gasket
• Exhaust gasket
• Head gasket

Specifications

• Bore: 80mm (+3mm)
• Displacement: 269cc
• Compression Ratio: 13.5:1
• Uses Vertex Piston #23943

Vehicle Fitments

• 2014 Yamaha YZ250F
• 2015 Yamaha YZ250F
• 2016 Yamaha YZ250F
• 2017 Yamaha YZ250F
• 2018 Yamaha YZ250F
• 2015 Yamaha WR250F
• 2016 Yamaha WR250F
• 2017 Yamaha WR250F
• 2018 Yamaha WR250F
• 2015 Yamaha YZ250FX
• 2016 Yamaha YZ250FX
• 2017 Yamaha YZ250FX
• 2018 Yamaha YZ250FX