Top 6 KX450F Big Bore Kit – Powersports Engine Kits

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1. Athena

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Athena Big Bore Kit 490cc Compatible with 16-18 Kawasaki KX450F

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Athena #ad - The athena big bore kit is the missing source for increasing your motorcycles raw power. For some models athena also supplies special long stroke racing kits complete with crankshafts and reinforced connecting rods.

In particular, racing kits consist of lighter pistons with a flat head, exhaust bridge, special portings, and a new cylinder head designed to increase the compression ratio and improve internal combustion. The included cylinder is constructed out of aluminum with a nickel-carbide coating to increase durability. 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.
BrandAthena #ad
ManufacturerAthena #ad
Height6 Inches
Length12.75 Inches
Weight5.4 Pounds
Width8.25 Inches
Part NumberP400250100023
ModelP400250100023

2. Outlaw Racing Products

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Outlaw Racing OR3978 Top End Gasket Complete Set Kawasaki KX450F 2009-2015 Dirt Kit

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Outlaw Racing Products #ad - Kits will contain the exact gaskets, seals, and O-rings you need to re-assemble your top end after a standard rebuild Set is for stock bore. Requires no trimming or modification! Exactly what you need to get your bike or atv rebuilt and running right! Made to exact oem specs but with better materials such as Stainless Steel, Fluoroviton, and Teflon so it lasts longer.
BrandOutlaw Racing Products #ad
ManufacturerOutlaw Racing Products #ad
Weight0.2 Pounds
Part NumberOR3978

3. Athena

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Athena Big Bore Kit 490cc Compatible with 06-08 Kawasaki KX450F

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Athena #ad - 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.

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. For some models athena also supplies special long stroke racing kits complete with crankshafts and reinforced connecting rods. In particular, special portings, exhaust bridge, racing kits consist of lighter pistons with a flat head, and a new cylinder head designed to increase the compression ratio and improve internal combustion.
BrandAthena #ad
ManufacturerAthena #ad
Weight3.6 Pounds
Part NumberP400250100003
ModelP400250100003

4. Cometic Gasket

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2006-2008 Kawasaki KX450F Dirt Bike Top End Engine Gasket Kit For 96mm Bore Size

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Cometic Gasket #ad - Off road / dirt est gasket kits contain components Required for a Typical 2 or 4 Stroke Top End Rebuild or Repair. Extreme sealing technology est Kits Come With All Components Necessary for a Top End Rebuild. Graphite gaskets feature a Steel Core, Laminated on Both Sides with Flexible Graphite. Fiber gaskets designed for Maximum Seal, Flexibility and Torque Retention. O-ring gaskets meet or Exceed OEM Specifications.
BrandCometic Gasket #ad
ManufacturerCometic Gasket #ad
Weight0.83 Pounds
Part NumberW68-31360e-138

5. Namura

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NX-20045, Namura, Size A HyperDryve Piston Kit Kawasaki KX450F Standard Bore 96mm

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Namura #ad - Uses low-expansion, low-friction piston alloy resulting in an extend life span of the piston. Precision machined to Japanese OEM specifications. Kit includes: piston, rings, and circlips. May increase horsepower and fuel economy by up to 6%.
BrandNamura #ad
ManufacturerNamura #ad
Height5 Inches
Length5 Inches
Weight1.03 Pounds
Width5 Inches
Part NumberNX-20045

6. Athena Parts

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Athena P400250100002 96mm 450cc Standard Bore Cylinder Kit

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Athena Parts #ad - Built from race proven designs to Kawasaki factory specifications. Podium-finisher with world-class teams across all forms of high-performance racing including super cross, superbike, motocross, GNCC, and more. Fits the following rides kawasaki KFX 450 R 2008-2014. Contracted from aluminum, the cylinder is lined with a nickel-carbide coating for durable, reliable performance. Maximizes power and service life in Kawasaki Dirt Bikes and offroad vehicles.
BrandAthena Parts #ad
ManufacturerAthena #ad
Height7.87 Inches
Length12.99 Inches
Weight4.3 Pounds
Width5.91 Inches
Part NumberP400250100002
ModelP400250100002
WarrantyWarranty disclaimer - Due to the nature of the application, these products are sold without any express warranty or any implied warranty of merchantability, or fitness for a particular purpose. Athena S.p.A. shall not, under any circumstances, be liable for any special, incidental or consequential damages, including, but not limited to, damage, or loss of property or equipment, loss of profits or revenue, cost of purchased or replacement goods, or claims of customers of the purchase, which may arise and/or result from sale, installation or use of these products