The Yamaha Raptor 660 is a legendary ATV, known for its powerful engine and robust build. But for those seeking even more power and performance, a big bore kit represents a significant upgrade. This comprehensive guide delves into everything you need to know about Raptor 660 big bore kits, from choosing the right kit to installation and potential issues. Whether you're a seasoned ATV mechanic or a weekend warrior, understanding the intricacies of this modification is key to maximizing your Raptor's potential.
What is a Raptor 660 Big Bore Kit?
A Raptor 660 big bore kit increases the engine's displacement, fundamentally enlarging the cylinders to accommodate a larger piston. This directly translates to a significant increase in horsepower and torque. These kits typically involve replacing the standard cylinders and pistons with larger-diameter components, requiring careful attention to detail during installation. The result is a machine that's noticeably more powerful, offering improved acceleration, hill-climbing ability, and overall performance.
What are the Benefits of a Big Bore Kit for my Raptor 660?
The benefits of installing a Raptor 660 big bore kit are numerous and significant for serious riders:
- Increased Horsepower and Torque: This is the primary advantage. A larger displacement engine delivers more power throughout the RPM range.
- Improved Acceleration: Feel the difference in how quickly your Raptor 660 accelerates, leaving others in the dust.
- Enhanced Hill Climbing Ability: Conquer steeper inclines with ease thanks to the boosted power and torque.
- Greater Towing Capacity: If you use your Raptor for towing, a big bore kit significantly increases its capabilities.
However, it's important to acknowledge that these modifications often come with trade-offs, which we'll explore later.
What Size Big Bore Kit Should I Choose for my Raptor 660?
Choosing the right big bore kit size depends on your riding style and desired performance level. Kits typically range from modest increases to substantial jumps in displacement. Larger kits offer more power but may require additional modifications to other engine components to maintain reliability. Consider factors like:
- Your Riding Style: Are you primarily trail riding, dune riding, or racing?
- Your Budget: Larger kits are more expensive and may necessitate additional upgrades.
- Your Mechanical Skills: Larger displacement kits often require more extensive modifications.
Consult with experienced mechanics or reputable ATV performance shops for expert advice tailored to your specific needs and riding style.
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. You can expect to pay anywhere from a few hundred dollars for a basic kit to well over a thousand dollars for high-performance options. Remember to factor in the cost of installation, which can be substantial if you don't perform the work yourself.
What are the Potential Drawbacks of a Raptor 660 Big Bore Kit?
While the benefits are substantial, it’s crucial to consider potential drawbacks:
- Increased Engine Wear: A larger engine operating under increased stress may wear out faster if not properly maintained.
- Reduced Engine Lifespan: Depending on the quality of the kit and maintenance, the lifespan of your engine might be shortened.
- Need for Additional Modifications: You might need to upgrade other engine components (like the carburetor or fuel injection system) to support the increased power output.
- Increased Fuel Consumption: Expect to see a noticeable increase in fuel consumption.
Do I need to modify other components after installing a big bore kit?
Yes, likely. Installing a big bore kit often necessitates complementary modifications to other engine components to ensure optimal performance and reliability. These may include:
- Carburetion/Fuel Injection Tuning: The increased displacement requires adjustments to fuel delivery.
- Air Intake System Upgrades: A larger air intake is often necessary to supply sufficient air to the engine.
- Exhaust System Upgrades: An upgraded exhaust system improves exhaust flow and power output.
How difficult is it to install a Raptor 660 big bore kit?
The difficulty of installation varies based on the kit and your mechanical experience. Some kits are relatively straightforward, while others require significant mechanical expertise. If you're not mechanically inclined, it's highly recommended to seek professional installation from a reputable ATV mechanic. Improper installation can lead to serious engine damage.
This guide provides a comprehensive overview of Raptor 660 big bore kits. Remember that this modification significantly alters your ATV’s performance and requires careful planning, selection of quality components, and potentially additional modifications. Always prioritize safety and seek professional advice when needed.
