Wiseco Std Piston Crankshaft Gasket Set 95mm 12.5:1 for Yamaha YZ450F 2003-2005

Wiseco Std Piston/Crankshaft/Gasket Set for Yamaha for Yamaha YZ450F

This Wiseco Std Piston/Crankshaft/Gasket Set is a complete top and bottom end rebuild kit for Yamaha YZ450F engines, combining a 95.00 mm standard bore piston producing 12.5:1 compression with a crankshaft assembly and full gasket set. The Wiseco Std Piston/Crankshaft/Gasket Set is built for riders and engine builders who want refreshed power delivery and reliable sealing on the workbench, whether the machine is track-bound or trail-ridden. Every component in this Wiseco Std Piston/Crankshaft/Gasket Set is matched to Yamaha YZ450F 2003-2005 fitment so the rebuild goes together without guesswork.

Overview

This rebuild bundle supplies a standard bore piston, crankshaft, and gasket set for Yamaha YZ450F engines. It restores compression and bottom-end integrity in one purchase. Built for mechanics and owners tackling a full top and bottom end refresh.

Built For Performance

• 95.00 mm standard bore piston maintains factory cylinder dimensions
• 12.5:1 compression ratio supports strong midrange and top-end response
• Crankshaft assembly restores bottom-end integrity
• Complete gasket set seals the top and bottom end during reassembly
• Kit format reduces sourcing time by bundling matched components together

Fits These Machines

• for Yamaha YZ450F 2003
• for Yamaha YZ450F 2004
• for Yamaha YZ450F 2005

On-The-Job Use

• Top and bottom end rebuilds during engine refresh
• Motocross use on Yamaha YZ450F machines
• Off-road riding and trail duty
• Workshop service and preventive maintenance

Specs At A Glance

Good To Know

Q: Can this kit be installed without splitting the cases? A: The crankshaft component requires splitting the cases, so plan for a full teardown during installation. If only a top end refresh is needed, the piston and gasket set can be used independently.

Q: Does this piston require re-plating or boring? A: Because it is a 95.00 mm standard bore piston, it suits a stock, undamaged cylinder rather than a resleeved or overbored one. Measure cylinder wear before ordering to confirm it stays within tolerance.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.