Barnett Performance Products' Scorpion Clutch is a popular upgrade for Harley-Davidson Sportster owners seeking enhanced clutch performance, improved durability, and smoother engagement. Designed for both stock and modified engines, the Scorpion Clutch offers increased surface area, customizable spring tension, and compatibility with wet or dry operation. This article provides a comprehensive overview of the installation process, component features, and user considerations based on real-world experiences and technical documentation.
Overview of the Barnett Scorpion Clutch
The Barnett Scorpion Clutch is engineered to provide improved clutch capacity and modulation for Harley-Davidson motorcycles. It is particularly suited for owners who have performed engine modifications, such as increased horsepower or torque, which can cause clutch slippage with factory components. The kit includes a billet aluminum pressure plate, a steel inner hub, and specially formulated clutch plates that increase surface area for better grip. The use of six coil springs instead of a diaphragm spring allows for a smoother and more linear engagement than standard setups.
The Scorpion Clutch is designed for both early and late model Sportsters, with different part numbers for specific years and engine configurations. The kit is compatible with both wet and dry clutch systems and can be used in open or enclosed primaries. This flexibility makes it suitable for a wide range of riding conditions and user preferences.
Users who have installed the Scorpion Clutch have noted a significant improvement in clutch feel and control. The ability to fine-tune spring tension allows riders to customize the clutch pull to their liking, making it ideal for both street and track use.
Key Components and Specifications
The Barnett Scorpion Clutch kit includes several key components that work together to improve performance:
Billet Aluminum Pressure Plate: This component replaces the factory pressure plate and provides increased rigidity and durability. It is machined from billet aluminum, which is lighter than the stock component while maintaining structural integrity.
Steel Inner Hub: The inner hub is made from steel, which provides better heat dissipation and wear resistance compared to the factory part. It is designed to fit into the primary case and work with the factory clutch basket.
Clutch Plates: The kit includes a set of friction and steel plates that increase the surface area of the clutch pack. This allows for higher torque capacity without the need for excessive spring tension. The plates are available in different configurations, such as a 9-plate and 10-plate setup, to suit different applications.
Clutch Springs: The Scorpion Clutch uses six coil springs instead of a diaphragm spring. This provides a more linear engagement and allows for fine-tuning of clutch feel. The kit includes multiple spring sets with varying tensions, enabling users to adjust the clutch pull to their preference.
Compatibility: The Scorpion Clutch is compatible with both wet and dry clutch systems and can be used in open or enclosed primaries. This makes it suitable for a wide range of Sportster models and engine configurations.
Installation Considerations: The installation process requires some specific tools, including a hydraulic press to remove the factory clutch hub from the basket. Users are also advised to refer to the factory service manual for detailed installation instructions.
Step-by-Step Installation Process
Installing the Barnett Scorpion Clutch requires careful planning and attention to detail. The following steps outline the general process based on user experiences and technical documentation:
Preparation: Before beginning the installation, ensure you have all the necessary tools and components. This includes a hydraulic press, clutch alignment tool, and the factory service manual. It is also recommended to have a clean workspace and to wear appropriate safety gear.
Removing the Factory Clutch: The first step in the installation process is to remove the factory clutch assembly. This involves disassembling the primary case and removing the clutch basket. The factory clutch hub must be removed using a hydraulic press to fit the new Barnett clutch hub into the basket.
Installing the Scorpion Clutch: Once the factory clutch has been removed, the new Barnett clutch components can be installed. This includes the billet aluminum pressure plate, steel inner hub, and clutch plates. The clutch springs should be installed according to the user's preference, using the provided spring sets to adjust tension.
Adjusting the Clutch: After installing the new clutch components, it is important to adjust the clutch pull to the desired tension. This can be done by selecting the appropriate spring set and fine-tuning the adjustment. Users are advised to test the clutch engagement and make any necessary adjustments before finalizing the installation.
Reassembling the Primary Case: Once the clutch has been installed and adjusted, the primary case can be reassembled. This includes reinstalling the clutch basket, pressure plate, and other components. It is important to follow the factory service manual for proper torque specifications and alignment.
Testing and Final Adjustments: After the installation is complete, it is recommended to test the clutch operation on a stand or during a short ride. This allows the user to make any final adjustments to the clutch pull and ensure that the clutch is functioning properly.
Customization and Tuning Options
One of the key advantages of the Barnett Scorpion Clutch is the ability to customize the clutch pull and engagement to suit the rider's preferences. The kit includes multiple spring sets with different tension levels, allowing users to fine-tune the clutch to their liking. For example, users who prefer a lighter clutch pull can choose a lower tension spring, while those who want a firmer engagement can opt for a higher tension spring.
Users have also reported that the Scorpion Clutch allows for a lighter lever pull compared to the stock clutch, especially when using the newer 9-plate configuration. This is due to the smaller diameter of the Scorpion hub, which reduces the effort required to engage the clutch.
In addition to spring tension, users can also choose between wet or dry operation, depending on their riding conditions and preferences. Wet operation involves using a lubricant in the primary case, while dry operation uses no lubricant and relies on the friction between the clutch plates to engage.
Fluid and Lubrication Considerations
Proper lubrication is an important aspect of maintaining the performance and longevity of the Barnett Scorpion Clutch. Users have reported varying opinions on the type of fluid to use, with some recommending ATF Type F, others suggesting HD Formula+, and some using Mobil1 V-Twin 20W50.
According to Barnett's documentation, the company does not specify a particular type of fluid for use with the Scorpion Clutch. However, users have reported that some clutch manufacturers recommend specific fluids for optimal performance. For example, HD clutches typically use HD Formula+, while other manufacturers may have different requirements.
It is important to note that the type of lubricant used can affect the performance of the clutch, particularly in terms of engagement and wear. Users are advised to consult the manufacturer's recommendations and to choose a lubricant that is suitable for both the clutch and any other components in the primary case.
Troubleshooting and Common Issues
While the Barnett Scorpion Clutch is generally well-regarded for its performance and durability, users have reported a few common issues that can arise during installation or use. These include:
Clutch Drag: Some users have experienced clutch drag, particularly with the older 10-plate configuration. This issue has been addressed in the newer 9-plate setup, which provides a slightly thinner stack and reduces drag.
Clutch Slip: Clutch slip can occur if the spring tension is too low or if the clutch is not properly adjusted. Users are advised to select the appropriate spring set and to fine-tune the adjustment to ensure optimal performance.
Installation Challenges: The installation process can be challenging for those without prior experience, particularly when removing the factory clutch hub using a hydraulic press. Users are encouraged to seek assistance if needed or to follow the factory service manual closely.
Lubrication Compatibility: As mentioned earlier, the type of lubricant used can affect the performance of the clutch. Users should ensure that the lubricant is compatible with both the clutch and any other components in the primary case.
User Experiences and Feedback
Several users have shared their experiences with the Barnett Scorpion Clutch, providing valuable insights into its performance and installation. One user reported that the Scorpion Clutch significantly improved the clutch feel and control compared to the stock setup. They also noted that the ability to adjust the spring tension allowed them to customize the clutch to their liking.
Another user mentioned that the installation process was straightforward but required some specific tools, such as a hydraulic press. They also recommended using the factory service manual to ensure a smooth installation.
Users who have installed the Scorpion Clutch with a Baker Compensator have noted that the clutch works well with this setup, particularly when using the appropriate lubricant. Some users have also reported that the Scorpion Clutch allows for a lighter lever pull, making it easier to ride in stop-and-go traffic.
Conclusion
The Barnett Scorpion Clutch is a high-performance upgrade for Harley-Davidson Sportster owners seeking improved clutch capacity, smoother engagement, and customizable tuning options. With its billet aluminum pressure plate, steel inner hub, and specially formulated clutch plates, the Scorpion Clutch offers enhanced durability and performance. The use of six coil springs instead of a diaphragm spring allows for a more linear engagement and fine-tuning of clutch pull.
Installation requires some specific tools, including a hydraulic press, and careful attention to detail. Users are advised to follow the factory service manual and to choose the appropriate lubricant for their application. The ability to customize the clutch to suit individual preferences makes the Scorpion Clutch a popular choice among riders.
Overall, the Barnett Scorpion Clutch provides a reliable and effective solution for those looking to improve their clutch performance on a Harley-Davidson Sportster.