The Yamaha Raptor 660 is a legendary ATV, known for its powerful engine and rugged performance. But for those seeking even more power and thrilling acceleration, a big bore kit is the ultimate upgrade. This comprehensive guide explores everything you need to know about Raptor 660 big bore kits, from choosing the right kit to installation and maintenance. We'll answer your burning questions and help you make an informed decision before unleashing the beast within your machine.
What is a Raptor 660 Big Bore Kit?
A big bore kit for your Raptor 660 involves increasing the engine's displacement by enlarging the cylinder bore. This is achieved by installing a larger-diameter piston and cylinder. The result? A significant increase in horsepower and torque, transforming your ATV's performance. Kits vary in bore size, offering different levels of power gains. Some popular options might increase displacement to 700cc or even 725cc. This upgrade fundamentally changes the engine's characteristics, demanding careful consideration of supporting modifications.
What are the Benefits of a Raptor 660 Big Bore Kit?
The advantages of installing a big bore kit on your Raptor 660 are substantial:
- Increased Horsepower and Torque: This is the primary benefit. A larger displacement engine delivers significantly more power throughout the RPM range.
- Improved Acceleration: Experience quicker acceleration and improved hill-climbing capabilities.
- Enhanced Performance: Overall performance is drastically enhanced, making your ATV more fun and capable.
However, it’s crucial to understand that these benefits come with considerations. Increased power can put stress on other components, requiring further upgrades to handle the boosted performance.
What are the Potential Drawbacks of a Raptor 660 Big Bore Kit?
While the power gains are enticing, it's important to acknowledge potential drawbacks:
- Increased Stress on Engine Components: The larger displacement puts additional strain on the connecting rod, crankshaft, and other internal components. Upgrades to these parts might be necessary to prevent damage.
- Higher Maintenance Costs: With increased power, maintenance needs increase as well. Expect more frequent oil changes and potential wear and tear on other engine parts.
- Fuel Consumption: A larger engine generally consumes more fuel.
How Much Horsepower Gain Can I Expect from a Raptor 660 Big Bore Kit?
The horsepower increase varies considerably depending on the specific kit and the accompanying modifications. A typical 700cc kit might yield a gain of around 10-15 horsepower, but some more extensive kits can produce even greater increases. Accurate horsepower figures often depend on factors such as the quality of the kit, installation, and the overall condition of the engine.
What Supporting Modifications Are Necessary for a Raptor 660 Big Bore Kit?
Installing a big bore kit often necessitates other upgrades to ensure the engine's longevity and optimal performance:
- High-Performance Exhaust System: A restrictive exhaust system will bottleneck the increased power output. Upgrading to a free-flowing exhaust is vital.
- Modified Air Intake: To supply the engine with the increased air required, an upgraded air intake system might be needed.
- High-Performance Clutch: A stronger clutch is crucial to handle the increased torque.
- Engine Tuning: Often, re-jetting the carburetor or using a fuel controller for fuel injection is necessary to optimize the air/fuel mixture.
What are the Different Types of Raptor 660 Big Bore Kits?
Several manufacturers offer big bore kits for the Raptor 660, each with its own design and specifications. It's crucial to thoroughly research and choose a reputable manufacturer that provides high-quality components. The differences lie primarily in the cylinder and piston materials, bore size, and associated tolerances.
How Difficult is it to Install a Raptor 660 Big Bore Kit?
Installing a big bore kit is a challenging task best left to experienced mechanics or ATV enthusiasts with solid mechanical skills. It requires precision and careful attention to detail. Incorrect installation can lead to engine damage.
How Much Does a Raptor 660 Big Bore Kit Cost?
The cost of a Raptor 660 big bore kit varies greatly depending on the brand, bore size, and included components. Expect to spend several hundred to over a thousand dollars, and that doesn't include the cost of installation or supporting modifications.
What is the lifespan of a Raptor 660 after installing a big bore kit?
The lifespan of a Raptor 660 after a big bore kit installation depends heavily on maintenance and the quality of the installation. With proper maintenance and high-quality components, you can still enjoy many years of reliable performance. However, the increased stress on components means more frequent inspections and potential repairs are possible.
This guide provides a comprehensive overview of Raptor 660 big bore kits. Remember, proper research, careful planning, and professional installation are crucial for a successful upgrade. Always prioritize the quality of components and prioritize the expertise of a qualified mechanic when undertaking such a significant modification.
