The Yamaha Raptor 660 is a legendary ATV, known for its power and handling. But for those seeking even more performance, a big bore kit offers a significant upgrade. This guide dives deep into everything you need to know about Raptor 660 big bore kits, helping you make an informed decision before unleashing the beast within your machine.
What is a Big Bore Kit?
A big bore kit increases the engine's displacement, resulting in a significant power boost. This is achieved by replacing the standard piston and cylinder with larger components, increasing the engine's bore (diameter). This allows for a larger combustion chamber, leading to a more powerful explosion and increased torque. A Raptor 660 big bore kit typically increases the engine's displacement from its stock 660cc to anywhere between 700cc and 750cc, and sometimes even more, depending on the specific kit.
What are the Benefits of a Raptor 660 Big Bore Kit?
The most obvious benefit is a substantial increase in horsepower and torque. This translates to improved acceleration, hill-climbing ability, and overall performance. But there are other advantages to consider:
- Increased Top Speed: A larger displacement engine can achieve higher top speeds.
- Improved Throttle Response: You'll experience a more responsive throttle, making the ATV more fun and exhilarating to ride.
- Enhanced Towing Capacity: The increased power makes it easier to tow heavier loads.
What are the Downsides of a Raptor 660 Big Bore Kit?
While the benefits are significant, there are also potential downsides to consider:
- Increased Wear and Tear: The larger displacement puts more stress on engine components, potentially leading to faster wear and tear. Proper maintenance is crucial.
- Higher Fuel Consumption: You can expect to see a slight increase in fuel consumption.
- Increased Engine Heat: Larger engines tend to generate more heat, requiring careful consideration of cooling system performance.
- Cost: Big bore kits are a significant investment, adding to the overall cost of owning and maintaining your ATV.
What is the Best Big Bore Kit for a Raptor 660?
There's no single "best" kit, as the ideal choice depends on your budget, riding style, and desired performance level. Research different brands and kits, comparing specifications, reviews, and prices. Consider factors like piston material (forged pistons are generally more durable), cylinder material, and the kit's overall reputation. Look for reputable brands with a proven track record of producing high-quality components.
What Modifications are Needed Besides a Big Bore Kit?
Simply installing a big bore kit isn't enough to maximize performance and ensure longevity. You'll likely need to consider other modifications to support the increased power output:
- High-Flow Air Intake: A larger intake allows for increased airflow, which is necessary to feed the larger engine.
- Performance Exhaust: A performance exhaust system helps to efficiently expel exhaust gases, further improving engine performance.
- Jetting Adjustments: You'll need to adjust the carburetor or fuel injection to match the new engine displacement. Incorrect jetting can lead to engine damage.
How Much Does a Raptor 660 Big Bore Kit Cost?
The cost varies greatly depending on the brand, displacement increase, and included components. Expect to pay anywhere from a few hundred to well over a thousand dollars. Remember to factor in the cost of installation and other necessary modifications.
How Difficult is it to Install a Raptor 660 Big Bore Kit?
Installing a big bore kit is a complex process that requires mechanical skills and specialized tools. Unless you have significant experience working on engines, it's best to have a professional mechanic perform the installation. Improper installation can lead to engine damage and void any warranties.
Will a Big Bore Kit Void My Warranty?
Installing a big bore kit will almost certainly void your manufacturer's warranty. This is because modifying the engine significantly alters its original design and increases the risk of damage.
Is a Big Bore Kit Worth It?
Whether a big bore kit is worth it depends on your individual needs and priorities. If you're looking for a significant power increase and are prepared to invest the time, money, and effort required, then a big bore kit can be a rewarding upgrade. However, if you're on a tight budget or lack the mechanical skills, it might be better to explore other performance upgrades. Carefully weigh the pros and cons before making a decision.
