Big Bore Kit

• Product Details

  Athena offers a wide range of cylinder kits for scooters and motorcycles with diameters and portings completely re-designed as original spare parts and / or specific boost to be used on tracks. In particular, racing kits consist of lighter pistons with a flat head, special portings, exhaust bridge, and a new cylinder head designed to increase the compression ratio and improve internal combustion. For some models Athena also supplies special long stroke racing kits complete with crankshafts and reinforced connecting rods.

  The Athena Big Bore kit is the missing source for increasing your motorcycles raw power.

  • The included cylinder is constructed out of aluminum with a nickel-carbide coating to increase durability.
  • The water jets have been widened for a higher flow rate, keeping the cylinder cool.
  • Athena built a reliable cast piston that has been molybdenum-coated for high performance use and extended wear life.
  • Includes a specially designed gasket kit to accommodate the big bore features.
  • Each kit also includes easy-to-follow step-by-step installation instructions.
  • Notes: Some kits will require case boring. Kits for 4-stroke applications do NOT include cylinder head. The cylinder head and base gaskets contained in the kit are specifically developed for Athena cylinders kits. Whenever the cylinder kit is disassembled, replace the gaskets with the specific Athena spare gasket kit: DO NOT use O.E. replacement gaskets. Image is for display purposes ONLY and may not represent actual product.

  Note: All Athena products which are manufactured with higher displacement and power than those permitted by law of the country where the end user lives are intended solely for competition-sports usage.

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• Fitment

• # Part Numbers

  Product Variant	Manufacturer Part #
  105cc	P400485100038, P400485100077
  144cc	P400485100030, P400250100011, P400485100029, P400485100101
  152cc	P400510100018
  164cc	P400210100023
  276cc	P400485100050, P400270100023, P400270100015, P400270100017, P400250100029
  280cc	P400270100004, P400210100009, P400270100007, P400210100033
  282cc	P400250100027
  283cc	P400485100097
  290cc	P400510100020, P400485100012, P400485100026, P400250100025, P400250100019, P400250100018, P400510100031, P400250100013, P400210100067
  300cc	P400485100073, P400220100002, P400220100004
  365cc	P400270100005, P400270100011
  435cc	P400510100002
  470cc	P400210100060
  478cc	P400485100021, P400485100014, P400485100016
  490cc	P400210100030, P400510100016, P400510100012, P400510100028, P400210100021, P400250100003, P400250100010, P400210100001, P400510100008, P400250100015, P400510100006
  496cc	P400485100092
  497cc	P400485100068
  500cc	P400485100054
  80cc	P400270100002, P400250100007

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