Cylinder Works Big Bore Kit

• Product Details

  Unlock your bike's hidden potential with the power producing and durable Cylinder Works big bore kit.

  O.E.M. appearing +1 mm to +4 mm big bore cylinder kit, a hand-matched, forged Vertex big bore piston and top-end gasket kit. These kits offer you an affordable way to increase horsepower and engine displacement without giving your secret away to your competition.

  • Cylinder - New, not remanufactured, cast aluminum nickel silicon carbide (NSC) electroplated big bore cylinder that appears just like an O.E. cylinder. NSC is a composite of a nickel and silicon carbide, providing an excellent wear resistant surface with oil retention capabilities. Cylinders are then diamond honed to the exact bore dimension and proper surface finish to ensure the proper ring seal and oil retention.
  • Vertex Big Bore Piston - To handle the internal pressures of a four-stroke engine, Vertex's big bore four-stroke pistons are forged from the highest quality 2618 aluminum alloy for superior strength and durability. Vertex uses unique piston profiles and compression ratios, offered in A, B, C and D sizes, to maximize power and performance while reducing blow-by and oil consumption. Each Vertex piston is then hand matched to fit each Cylinder Works cylinder perfectly.
  • Gasket Kits - These kits contain the necessary gaskets to rebuild your top end. Kits include head, base, exhaust gaskets, and O-rings necessary when removing the cylinder and head during routine maintenance.
  • Kit includes: Big bore cylinder, Vertex piston, piston rings, piston pin, circlips, gasket kit.
  • Note: To achieve optimum performance, re-jet the carburetor with the available jet kits (sold separately) or a fuel-injection fuel management controller.

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• Cylinder Works Big Bore Kit Review

• 41 Questions about the Cylinder Works Big Bore Kit

• Fitment

• # Part Numbers for the Cylinder Works Big Bore Kit

  Product Variant	Manufacturer Part #
  +2mm	51007-K01
  +3mm	11010-K01, 31012-K01, 51006-K01
  +3mm/478cc	23001-K01
  +5mm	61004-K01
  103.5cc	21007-K01
  107.8cc	21107-K01
  1110cc	61003-K01
  159cc	11004-K01, 11004-K02
  256cc	12001-K01
  269cc	11001-K01, 31001-K01, 31004-K01, 21002-K01, 31006-K01, 31006-K02, 31005-K01, 41003-K01, 41004-K01, 41004-K02, 21010-K01
  270cc	11007-K01, 51004-K01, CW11011K01, CW21013K01
  276cc	51002-K01
  365cc	51001-K01, 51003-K01
  366cc	CW51008K01
  434cc	41001-K01
  468cc	21005-K01, 21005-K02, CW21012K01
  469cc	31011-K01
  474cc	41002-K01
  477cc	11005-K01
  478cc	11006-K01, 21003-K01, 11006-K02, 11008-K01, 23001-K02, 21003-K02
  479cc	11003-K01
  488cc	11002-K01
  727cc	11009-K01, 21004-K01, 21004-K02, 21104-K01, 21104-K02
  808cc	61002-K01, 61002-K02
  859cc	31007-K02
  860cc	31007-K01
  975cc	61001-K01

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