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