The EFM No-Stall Auto Clutch represents a specialized modification for motorcycles that eliminates the need for manual clutch engagement during operation. Designed for both street and dirt bikes, this automatic clutch system provides enhanced control and convenience for riders by allowing smooth acceleration and stopping without touching the clutch lever. Installation and functionality of the EFM No-Stall Auto Clutch are supported by a direct bolt-on approach, minimal maintenance, and a lifetime warranty. This article provides a detailed overview of the installation process, product features, and user feedback based on publicly available information.
Overview of the EFM No-Stall Auto Clutch
The EFM No-Stall Auto Clutch is an automatic pressure plate designed to replace the standard manual clutch in a wide variety of motorcycles. It is compatible with both American and metric models, including street bikes and dirt bikes, and functions by responding to engine RPM rather than bike movement. This allows for instant lockup and improved holding power, making it ideal for riders who prefer a no-stall experience or have physical limitations that make manual clutch use difficult.
According to the documentation, the EFM unit is engineered to bolt directly into the motorcycle's existing clutch assembly. The installation does not require modifications to the bike, and the system is designed to work with any type of clutch lever—cable, hydraulic, twist, or foot pedal. Once installed, the clutch requires minimal adjustment and no regular maintenance, making it a convenient upgrade for both experienced and novice riders.
Installation Process and User Experiences
The installation of the EFM No-Stall Auto Clutch is generally described as a straightforward process for users familiar with basic motorcycle maintenance. The unit is a direct replacement for the stock clutch, and the installation typically takes between one to two hours, depending on the model and the extent of disassembly required to access the primary. No major modifications to the bike are necessary, and users are advised to check for clearance after installation.
User experiences with the EFM No-Stall Auto Clutch vary slightly, but overall the product is described as effective and reliable. One user detailed the process of shipping their stock clutch and receiving the modified EFM unit, which included a clutch basket that could not be returned to its original configuration without purchasing new parts from Kawasaki. The user installed the EFM clutch, spacer, gasket, and cover as instructed, noting that the clutch release shaft was removed and the hole plugged. The installation was completed using RTV silicone sealant and standard tools.
Initial riding impressions from this user indicated a learning curve, as the automatic clutch required adjustment to riding habits. Shifting was described as "notchy," and finding neutral while the engine was running proved challenging. However, the user noted that confidence improved significantly when navigating loose terrain and hills, allowing for near-instant stop-and-go capability. The user also observed that the clutch could slip slightly if the bike was ridden in a higher gear than usual or at lower RPMs, which could be mitigated by adjusting gear selection and RPM usage.
Another user shared a similar experience, noting that the clutch initially slipped during the first test ride and required some fine-tuning. The user adjusted the clutch basket by replacing one of the steel components with a thicker plate, which improved performance. Additional adjustments were made to the push rod, which was extended to about 1 1/4 turns instead of the recommended 2 turns. After these adjustments, the bike performed well at idle and low RPMs, with the clutch holding securely and allowing for controlled takeoffs and burnouts.
These user experiences highlight the importance of following installation instructions carefully and making necessary adjustments based on individual riding conditions and preferences. While the EFM No-Stall Auto Clutch is designed to be a set-and-forget solution, some users may find that minor tuning improves performance.
Technical Specifications and Compatibility
The EFM No-Stall Auto Clutch is compatible with a wide range of motorcycle models, including both American and metric bikes, as well as street and dirt bikes. The documentation does not specify exact model years or engine types, but it is stated that the EFM has been in the motorcycle industry since 1990 and has been producing automatic clutches since 1996. The product is designed to work with any primary type—wet or dry, open or enclosed—and is built using advanced CAD-CAM technology for rapid prototyping and precision.
The EFM unit replaces the stock pressure plate or clutch entirely and functions as a bolt-on component. No modifications are required to the motorcycle’s frame or transmission, and the unit is designed to fit without compromising clearance. The system is also compatible with hydraulic clutches, and users are advised to retain the manual clutch lever for use during shifting, though it requires significantly less effort than a standard clutch.
One of the key advantages of the EFM No-Stall Auto Clutch is its ability to respond to throttle input rather than relying on bike movement. This allows for instant lockup and improved holding power, making it suitable for burnouts and technical terrain. The unit has been tested on high-performance motorcycles, including turbocharged and supercharged models producing up to 280 horsepower, and no slippage has been reported.
Warranty and Support
The EFM No-Stall Auto Clutch comes with a lifetime warranty covering material and workmanship. This warranty is a key selling point for the product, as it provides users with long-term assurance against defects and malfunctions. According to the documentation, the EFM unit has no moving parts that can wear out, which contributes to its durability and reliability. The warranty does not cover damage caused by improper installation, abuse, or modifications outside the manufacturer's recommendations.
Users who have installed the EFM No-Stall Auto Clutch report positive experiences with customer support. One user, for example, noted that Garry Buzzelli from EFM was highly responsive and provided patient assistance throughout the installation process. This level of support is important for users who may be unfamiliar with clutch systems and require guidance during installation or troubleshooting.
Performance and Practical Considerations
The EFM No-Stall Auto Clutch is marketed as an improvement over both stock and other aftermarket clutches. Its ability to respond to engine RPM rather than bike movement allows for more precise control and immediate engagement, which is particularly useful in stop-and-go situations and technical riding conditions. The system also eliminates the need for frequent clutch lever use, which can reduce rider fatigue and improve overall comfort.
However, users should be aware that the EFM No-Stall Auto Clutch does not automatically shift gears. The rider is still responsible for manual shifting, although the clutch lever can still be used for smoother gear changes. The system also requires users to maintain the correct RPM range and gear selection to avoid slippage, which can be a learning curve for some riders.
In terms of maintenance, the EFM No-Stall Auto Clutch is described as a low-maintenance solution. Once installed and properly adjusted, the unit is expected to function without requiring regular servicing. Users are advised to avoid abusive riding practices, such as excessive slipping or taking off in the wrong gear, as these can affect performance and longevity.
Conclusion
The EFM No-Stall Auto Clutch is a specialized upgrade for motorcycle riders seeking a no-stall, automatic clutch system that enhances control and convenience. The installation process is straightforward for users with basic mechanical skills, and the product is designed to be compatible with a wide range of motorcycle models. User experiences indicate that the system performs well, with some requiring minor adjustments for optimal performance. The lifetime warranty and responsive customer support further enhance the product's appeal. While the EFM No-Stall Auto Clutch does not eliminate the need for manual shifting, it provides a significant improvement in clutch control and rideability, making it a valuable option for both casual and performance-oriented riders.