The Yamaha Raptor 660 is a legendary ATV, known for its raw power and aggressive handling. But for those seeking to push the boundaries even further, a big bore kit offers a significant performance upgrade. This comprehensive guide explores everything you need to know about Raptor 660 big bore kits, from the benefits and considerations to installation and maintenance. We'll also address common questions surrounding this popular modification.
What are the Benefits of a Raptor 660 Big Bore Kit?
A big bore kit increases the engine's displacement by enlarging the cylinder bore. This translates to a substantial boost in horsepower and torque. You'll experience noticeably improved acceleration, hill-climbing ability, and overall performance. The increased power makes tackling challenging terrain significantly easier and more enjoyable. However, it's crucial to remember that this increased power should be coupled with appropriate safety measures and riding skill.
What are the Different Types of Raptor 660 Big Bore Kits?
Several manufacturers offer big bore kits for the Raptor 660, each with varying specifications. These kits typically include a larger cylinder, piston, rings, and potentially other components like gaskets and head studs. The size of the increase varies; common options include 686cc, 700cc, and even larger displacements. The choice depends on your desired performance level and budget. Researching different brands and their respective reputations is vital before making a purchase. Consider factors like the kit's construction quality, customer reviews, and the manufacturer's warranty.
How Much Horsepower Gain Can I Expect?
The horsepower gain from a big bore kit varies depending on the specific kit and other modifications made to the engine. A typical 686cc kit might yield a 10-15 horsepower increase, while larger kits can produce even more significant gains. However, it's important to remember that these gains are estimates and actual results may vary. Other factors, such as proper tuning and air intake modifications, also influence the final power output.
What are the Potential Drawbacks of a Big Bore Kit?
While big bore kits offer substantial performance improvements, it’s important to weigh the potential drawbacks. Increased engine stress can lead to accelerated wear and tear on various engine components. This necessitates more frequent maintenance, including more frequent oil changes and potentially more frequent rebuilds over time. Additionally, the increased power might necessitate upgrades to other parts of the ATV's drivetrain to handle the added stress. This could include the clutch, transmission, and even the axles. Finally, improperly installed or tuned big bore kits can cause severe engine damage.
Do I Need Other Modifications Along with a Big Bore Kit?
To maximize performance and longevity, you'll likely need additional modifications alongside a big bore kit. These may include a high-flow air filter, performance exhaust system, upgraded carburetor or fuel injection system, and possibly even a stronger clutch. Failing to make these supporting modifications could limit the performance gains from the big bore kit, and may even strain the engine causing premature failure. Thorough research into the kit's specifications and recommended supporting modifications is critical.
How Difficult is it to Install a Raptor 660 Big Bore Kit?
Installing a big bore kit is a significant undertaking and is best left to experienced mechanics. It involves precise machining and requires a thorough understanding of engine mechanics. Improper installation can result in catastrophic engine damage. Unless you possess extensive mechanical expertise, it's highly recommended to have a professional mechanic install the kit to ensure correct operation and prevent potential issues.
How Much Does a Raptor 660 Big Bore Kit Cost?
The cost of a Raptor 660 big bore kit varies depending on the size, brand, and included components. Expect to pay anywhere from several hundred to over a thousand dollars for a complete kit. Remember that this is just the cost of the kit itself; you will also need to factor in the cost of installation and potentially other supporting modifications.
This comprehensive guide provides a solid foundation for anyone considering a Raptor 660 big bore kit. Remember to always prioritize safety and proper installation to fully enjoy the enhanced performance this modification offers.
