Description

This Bottom End Rebuild Kit for the 2004–2009 Yamaha YFZ 450 provides the core components needed to restore strength, sealing, and smooth rotation in the lower end of your engine. This setup includes a stroker-style crankshaft that increases the effective displacement, bringing the engine to a true 450cc while still fitting the stock piston. The REV6 1-year warranty backs everything.

THIS KIT INCLUDES

• Crankshaft
• Crankshaft main bearings
• Complete gasket set
• Oil seal set
• Transmission bearing kit

LEARN MORE & GET SUPPORT

See what’s covered in our warranty policy. For build tips and performance guidance, explore the REV6 Blog. You can also find quick answers in our FAQ section or reach our support team through the contact page.

FITMENT

Yamaha YFZ 450
2004–2009 Models

TAKE ACTION

This bottom-end rebuild kit gives your YFZ 450 the solid foundation it needs for reliable power and long-term durability. With nationwide shipping, it’s easy to start your rebuild—add this kit to your cart today.

REV6 proudly supports riders nationwide, including veterans and active-duty servicemembers—ask about available discounts.