CYLINDER FULL KIT 85mm YAMAHA YZ 250F 2024, ATHENA P400485100106 304CC BIG BORE, (Piston included)

Athena big bore cylinder full kit (part reference P400485100106) for Yamaha YZ F 250 applications, increasing displacement via an 85 mm bore to 304 cc. Supplied with high-grade cylinder, forged piston with pin and rings, complete gasket set, and a pre-mapped GET Boost module that installs without ECU or wiring modifications to suit this configuration.

Features

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  Big bore cylinder kit Ø 85 mm, 304 cc to increase performance

  
  


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  Cylinder manufactured from high-silicon aluminium alloy with an oversized steel liner

  
  


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  Steel liner fused using co-casting process for heat transfer and combustion sealing

  
  


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  Forged piston, CNC-machined

  
  


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  Molybdenum disulphide piston coating to reduce friction

  
  


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  DLC-coated piston pin for hardness and durability

  
  


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  Piston rings and pin included

  
  


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  Complete gasket set included

  
  


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  MLS head gasket, laser-cut stainless steel

  
  


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  GET Boost electronic module included, pre-calibrated for this kit

  
  


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  GET Boost installs without ECU or wiring modifications

  
  


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  Dedicated harness connects to injector and throttle body

  
  


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  Pre-mapped to suit the new cylinder configuration

  
  


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  Piston included

  
  


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  Athena part reference: P400485100106

  
  

Specifications

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  Bore diameter: 85.00 mm

  
  


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  Displacement: 304.00 cc

  
  

Vehicle Fitments

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  YAMAHA YZ F 250 cc (2024 Only)