Cylinder Works Big Bore Cylinder Kit - 21003-K01

Item # : 228703

Processing Time: Leaves our warehouse in 1 to 2 days.

List : $954.95


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  • Manufacturer: Cylinder Works



Cylinder Works Big Bore Cylinder Kit

  • (+3mm Big Bore Kit) 478cc. Uses Vertex #23404 Includes (Cylinder, Piston, Rings, Pin, Clips, Gaskets)
  • Ready-to-install, direct bolt-on cylinders require no re-plating and look virtually identical to the OEM cylinders
  • Three kit options to choose from: Standard Bore, Standard Bore Hi-Compression and Big Bore
  • Cylinder kits include matched Vertex pistons to ensure longevity, performance and reduced engine noise
  • Nickel Silicon Carbide plated for long life
  • Kits come complete with gaskets, cylinder, piston, rings, pin and clips
  • Big bore cylinders do not require machine work (unless noted)

Fits: 2007 - 2014 Yamaha WR 450F, 2006 - 2009 Yamaha YZ 450F

Technical Specifications:
  • Compression Ratio (x:y): 12.5:1
  • Cylinder Diameter (mm): 98.00
  • Displacement (cc): 478.00
  • Piston Diameter (mm): .00
  • SizeOverStandard: 3.00

Manufacturer Part Number: 21003-K01