CYLINDER FULL KIT +5.60mm BIG BORE 72.00mm YAMAHA 2003 – 2025 YZ 2T 250 ATHENA P400485100042

Athena Big Bore Cylinder Kit for Yamaha YZ 250 2T, increasing displacement to 293cc with a bore diameter of 72.00mm (+5.60mm over stock). Engineered in Italy, this kit includes a high-quality aluminum cylinder with a nickel-silicon coating for durability and wear resistance. Designed for direct installation without modifications to the engine crankcase.

Features

• Increases displacement to 293cc
• Bore diameter: 72.00mm (+5.60mm over stock)
• Compression ratio: 15.0:1
• Nickel-silicon coated for wear resistance
• Includes all necessary components for installation
• No modifications required to the engine crankcase

Specifications

• Bore Diameter: 72.00mm
• Bore Gain: +5.6mm
• Compression Ratio: 15.0:1
• Displacement: 293cc
• Net Weight: 3.50 kg

Included Components

• Aluminum cylinder
• Cylinder head
• Complete piston (with piston pin and rings)
• Exhaust valve kit
• Gasket kit

Cross-Reference OEM Part Numbers

• S4F07200006A (Piston Kit 71.95mm)
• S4F07200006B (Piston Kit 71.96mm)
• P400485160183 (Gasket Kit)
• S410485308029 (Cylinder Head)
• S410485303025 (Valve Assy Kit)
• S41316257 (Rings)

Vehicle Fitments

• Yamaha YZ 250 2T (2003-2025)