The Yamaha Raptor 660 is a legendary ATV, known for its raw power and aggressive handling. But for those seeking even more performance, a big bore kit offers a significant upgrade, transforming this already potent machine into a true powerhouse. This guide explores everything you need to know about Raptor 660 big bore kits, helping you make an informed decision and unleash the beast within your ATV.
What is a Raptor 660 Big Bore Kit?
A big bore kit fundamentally increases the engine's displacement, resulting in a substantial power boost. This is achieved by installing a larger-diameter piston and cylinder, effectively enlarging the combustion chamber. This increased volume allows for more fuel and air to be burned during each combustion cycle, translating directly into increased horsepower and torque. Choosing the right kit is crucial, as different kits offer varying levels of performance and reliability.
What are the Benefits of a Raptor 660 Big Bore Kit?
Installing a big bore kit on your Raptor 660 offers several compelling advantages:
- Significant Horsepower and Torque Increase: This is the primary reason riders opt for a big bore kit. Expect a noticeable jump in both horsepower and torque, making your ATV significantly faster and more powerful, especially in challenging terrains.
- Improved Acceleration: The extra power translates to quicker acceleration, leaving competitors in the dust. This is particularly noticeable when climbing hills or accelerating out of corners.
- Enhanced Hill Climbing Ability: The increased torque makes hill climbing significantly easier, allowing you to tackle steeper inclines with greater confidence.
- Greater Pulling Power: For towing or hauling, the added power provides a considerable advantage.
What are the potential drawbacks of a Raptor 660 Big Bore Kit?
While the benefits are considerable, it's important to acknowledge potential drawbacks:
- Increased Engine Strain: A larger engine requires more lubrication and cooling. Neglecting proper maintenance can lead to premature engine wear.
- Higher Fuel Consumption: Expect slightly increased fuel consumption due to the larger engine displacement.
- Potential for Reduced Engine Lifespan (if improperly installed or maintained): A poorly installed or maintained big bore kit can significantly reduce the lifespan of your engine. Professional installation is highly recommended.
- Cost: Big bore kits are a significant investment, requiring the purchase of several components beyond just the piston and cylinder.
What size big bore kit is best for a Raptor 660?
The ideal big bore kit size depends on your riding style and preferences. Options generally range from a modest increase to significantly larger displacements. Larger kits offer more power but often come with increased engine strain and potentially reduced reliability. Research reputable manufacturers and read reviews to find a kit that balances performance with longevity.
Do I need to change other parts when installing a Raptor 660 big bore kit?
Yes, installing a big bore kit typically necessitates other modifications to ensure optimal performance and engine reliability. These might include:
- High-performance carburetor or fuel injection system: To deliver the increased fuel flow required by the larger engine.
- Modified air intake: To provide sufficient airflow to the engine.
- High-performance exhaust system: To improve exhaust flow and prevent engine restrictions.
- Strengthened connecting rod: To handle the increased stress from the larger piston.
How much does a Raptor 660 big bore kit cost?
The cost varies significantly depending on the kit's size and brand. Expect to invest several hundred to over a thousand dollars for a complete kit, including installation. Remember to factor in the cost of additional components like the carburetor, air intake, and exhaust system.
Where can I buy a Raptor 660 big bore kit?
Big bore kits are available from various ATV parts retailers, both online and brick-and-mortar stores. Research reputable suppliers with a proven track record and positive customer reviews. Always verify the kit's compatibility with your specific Raptor 660 model year.
Is installing a Raptor 660 big bore kit difficult?
Installing a big bore kit is a complex process requiring mechanical expertise. Unless you possess significant engine rebuilding experience, professional installation is strongly recommended. Improper installation can damage your engine, voiding warranties and potentially leading to costly repairs.
This comprehensive guide offers a solid foundation for understanding Raptor 660 big bore kits. Remember to prioritize quality components, professional installation, and ongoing maintenance to maximize performance and longevity. By carefully considering these factors, you can safely and effectively unleash the untapped potential of your Yamaha Raptor 660.
