The Yamaha Raptor 660 is a legendary ATV, known for its powerful engine and robust build. But for those seeking even more performance, a big bore kit offers a significant upgrade, transforming your machine into a true powerhouse. This comprehensive guide dives deep into everything you need to know about Raptor 660 big bore kits, from choosing the right kit to installation and maintenance.
What is a Raptor 660 Big Bore Kit?
A Raptor 660 big bore kit increases the engine's displacement, primarily by enlarging the cylinder bore. This results in a larger combustion chamber, allowing for a greater volume of fuel and air mixture to be burned during each power stroke. This translates directly to increased horsepower and torque, delivering a noticeable improvement in acceleration, top speed, and overall performance. These kits typically include a larger cylinder, a new piston, rings, and possibly other components like gaskets and pins.
What are the Benefits of a Raptor 660 Big Bore Kit?
The advantages of installing a big bore kit are significant:
- Increased Horsepower and Torque: This is the primary benefit. Expect a substantial gain in power, making hill climbs easier and top speed higher.
- Improved Acceleration: Feel the difference in quicker acceleration, leaving competitors in the dust.
- Enhanced Performance: Experience a noticeable improvement in overall performance, handling rough terrain with greater ease.
What are the Drawbacks of a Raptor 660 Big Bore Kit?
While the benefits are tempting, consider these potential drawbacks:
- Increased Engine Wear: A larger bore puts more stress on engine components, potentially leading to shorter lifespan if not properly maintained.
- Higher Fuel Consumption: Expect slightly increased fuel consumption due to the larger engine displacement.
- Cost: Big bore kits can be a significant investment, adding to the overall cost of ownership.
- Warranty Implications: Installing a big bore kit will likely void your factory warranty.
What Size Big Bore Kit Should I Choose for My Raptor 660?
Choosing the right kit size depends on your riding style and desired performance level. Kits are typically available in various sizes, ranging from mild to extreme increases in displacement. A smaller increase offers a good balance between performance gains and engine longevity, while larger kits provide substantial power boosts at the cost of increased engine stress. Consider consulting with experienced mechanics or ATV enthusiasts for recommendations based on your specific needs.
How Much Does a Raptor 660 Big Bore Kit Cost?
The cost of a Raptor 660 big bore kit varies considerably depending on the brand, size, and included components. Expect to pay anywhere from a few hundred dollars for a basic kit to over a thousand dollars for a high-performance kit with additional components. Remember to factor in the cost of installation and any necessary supporting modifications.
What are the Necessary Supporting Modifications for a Raptor 660 Big Bore Kit?
Installing a big bore kit often necessitates other modifications to maximize performance and reliability:
- Jetting: Adjusting the carburetor jetting is crucial to ensure proper fuel delivery to the larger engine. Incorrect jetting can lead to poor performance or engine damage.
- Air Intake: Upgrading the air intake system may be necessary to provide sufficient airflow for the increased displacement.
- Exhaust System: A performance exhaust system will improve exhaust flow and optimize power output.
Can I Install a Raptor 660 Big Bore Kit Myself?
While technically possible for experienced mechanics, installing a big bore kit is a complex process requiring specialized tools and knowledge. Mistakes during installation can cause significant engine damage. It's highly recommended to have a professional mechanic perform the installation to ensure proper setup and avoid potential problems.
How Do I Maintain a Raptor 660 with a Big Bore Kit?
Regular maintenance is crucial for a big bore kitted Raptor 660. Pay close attention to:
- Oil Changes: More frequent oil changes are recommended due to the increased stress on the engine.
- Air Filter Maintenance: Keep the air filter clean to prevent dirt and debris from entering the engine.
- Cooling System: Monitor the cooling system to ensure proper temperature regulation.
This guide provides a solid foundation for understanding Raptor 660 big bore kits. Remember to always prioritize safety and consult with experienced professionals for advice and installation. Enjoy the power boost!
