Cylinder Works +5mm Big Bore Complete Cylinder Kit for the 2002-2018 Yamaha YZ85 increases displacement to 103.5cc. This direct bolt-on upgrade requires no re-plating and includes all necessary components for installation. The cylinder is Nickel Silicon Carbide plated for durability and honed to exact size for easy piston installation. Note: The cylinder head must be modified for proper fitment.

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
• Big bore design increases displacement to 103.5cc
• Includes all necessary components for installation
• Note: Cylinder head modification is required

Included Items

• Cylinder
• Piston
• Piston pin
• Two circlips
• Piston ring
• Gasket set

Specifications

• Bore: +5mm
• Displacement: 103.5cc
• Compression: Standard
• Uses Vertex Piston #23628

Cross-Reference OEM Part Numbers

• YAMAHA: 5PA-11311-00-00
• YAMAHA: 5PA-11311-01-00
• YAMAHA: 5PA-11311-10-00

Vehicle Fitments

• 2002-2018 Yamaha YZ85