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Hot Rods Bottom End kits include everything needed to complete crankshaft installation:Hot Rods main bearings and seals kit (Main seals included when applicable)Complete engine gasket set includes all gaskets and seals for complete engine rebuild (Does...

Convenient one-stop shop in a box; nearly all components required for a complete and professional rebuildVertex piston kit (standard compression piston, rings, pin and clips)Hot Rods heavy duty crank (stock strokeincludes wrist pin bearing for two...

Convenient one-stop shop in a box; nearly all components required for a complete and professional rebuildVertex piston kit (standard compression piston, rings, pin and clips)Hot Rods heavy duty crank (stock strokeincludes wrist pin bearing for two...

Convenient one-stop shop in a box; nearly all components required for a complete and professional rebuildVertex piston kit (standard compression piston, rings, pin and clips)Hot Rods heavy duty crank (stock strokeincludes wrist pin bearing for two...

 Stage 1: single-cam motor. Excellent midrange and top-end power increase. Uses stock auto-decompression mechanism. Uses stock valve springs.

 (+2mm Big Bore Kit) makes 159cc. 11.7:1 compression. Uses Vertex #23520. When using Hot Rods 4175 makes 166cc Includes (Cylinder, Piston, Rings, Pin, Clips, Gaskets) 

 (+4mm Big Bore Kit) makes 488cc. 12.1:1 comp. Uses Vertex #22966. When using Hot Rods #4148 makes 511cc. Includes (Cylinder, Piston, Rings, Pin, Clips, Gaskets)

 (+1mm Big Bore Kit) 256cc. 13.0:1. Uses Vertex #23461. When using Hot Rods #4183 makes 263cc. Includes (Cylinder, Piston, Rings, Pin, Clips, Gaskets)

OE Part Number(s):YAMAHA: 2S2-11400-00-00YAMAHA: 2S2-11400-01-00For Models:2006 - 2009 Yamaha YZ 450F

Ready-to-install, direct bolt-on cylinders require no re-plating and lookvirtually identical to the OEM cylindersThree kit options to choose from: Standard Bore, Standard Bore Hi-Compression and Big BoreCylinder kits include matched Vertex pistons to...

Ready-to-install, direct bolt-on cylinders require no re-plating and look virtually identical to the OEM cylindersCylinder kits include matched Vertex pistons to ensure longevity, performance and reduced engine noiseNickel Silicon Carbide plated for long...

Ready-to-install, direct bolt-on cylinders require no re-plating and look virtually identical to the OEM cylindersCylinder kits include matched Vertex pistons to ensure longevity, performance and reduced engine noiseNickel Silicon Carbide plated for long...