1. Athena 480cc Big Bore Kit: Athena's 480cc kit offers a significant increase in displacement and power over the stock YFZ 450. It includes a forged aluminum piston, cylinder sleeve, and all necessary gaskets and seals. This kit is known for its durability and reliability, making it a great choice for riders who want to improve their performance without sacrificing longevity.
2. JE 485cc Big Bore Kit: JE Pistons' 485cc kit is another excellent option for YFZ 450 owners. This kit includes a high-quality forged piston, cylinder sleeve, and gaskets/seals. It is known for providing a balance of power and reliability, making it a good choice for riders who want to upgrade their performance without sacrificing too much low-end torque.
3. CP Pistons 499cc Big Bore Kit: CP Pistons offers a 499cc big bore kit that delivers maximum displacement and power. It includes a forged aluminum piston, cylinder sleeve, and necessary hardware. This kit is ideal for riders who prioritize outright performance and are willing to sacrifice some low-end torque for top-end power.
4. Wiseco 475cc Big Bore Kit: Wiseco's 475cc kit is a great middle ground between the 480cc and 499cc kits. It provides a noticeable increase in power while still maintaining good low-end torque. The kit includes a forged piston, cylinder sleeve, and gaskets/seals.
Before selecting a big bore kit, consider factors such as your riding style, skill level, budget, and desired performance gains. It's always a good idea to consult with experienced riders or mechanics to get advice tailored to your specific needs and preferences.
