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STM Slipper Clutches & Billet Parts
STM Aprilia Dorsoduro / Shiver Slipper Clutch
List Price: $1,250.28
Enjoy The Ride
Usually Ships in 3 to 5 Days
This STM slipper clutche fits the following Aprilia bikes: Aprilia Dorsoduro 750: FAP-S030 Aprilia Shiver 750: FAP-S030 Thanks to STM Technologies, the first and only slipper clutch for the brand new Aprlia Dorsoduro 750 has been born. The prototype and test results where far beyond expectations, which decreed the absolute need of the STM clutch to definitely appreciate all the performance the Dorsoduro has to offer. Engaging of gears is softer and easier, approach corners in complete safety, less consumption of the mechanical parts involved, constant and responsive feedback from the lever, best traction control and a complete adaptation of the engine brake to individual riding style? all these features make this clutch the main accessory to appreciate the wonderful characteristics of this bike. Slipper clutch main features: Primary Diaphragm Spring: 125mm in diameter for more accurate and uniform pressure on the plates, and to aid in better starts. Secondary Diaphragm Spring: Interchangeable and available in 10kg increments to adjust the amount of engine brake to each individual riding style in a fast and accurate way. FLS III (FORCE LUBRICATION SYSTEM), superior lubrication of the internal clutch parts which leads to increase cooling and longetivity of the unit as a whole. Billet machined from Ergal 7075 material, ensuring above average lightness and duration. Disc Pack and basket: Original replacement Aprilia. Features: slipper system - device to control the opening - Forced Lubrication System 3 Compatible disc pack: original Aprilia (not included) Compatible basket: original Aprilia (not included) Tools: pressure plate mounting tool code UTL-0030 (recommended) UTL-0020 in case of the FAP-S010. Note: when choosing the primary spring keep in mind that the greater the spring tension, the greater the pressure on the disc pack and the smaller the slipping in acceleration. When choosing the secondary spring remember that the greater the spring tension, the greater the engine brake in deceleration
What does a slipper clutch do?
During rapid downshifting, a slipper clutch temporarily reduces the amount of friction in a clutch, which disconnects (to a degree) the final drive and transmission of a motorcycle. The result is a decrease in engine braking and an increase in rear wheel freewheeling.
What are the benefits of using a slipper clutch?
Performance: Decreasing engine braking leads to increasing the amount of rear wheel freewheeling. When rear wheel freewheeling is increased, cornering speed is also greatly increased. An increase in cornering speed directly leads to lower lap times! Also, the slipper clutch frees up the rider’s attention so they can focus it on other aspects of riding like reference points, body position, lean angel, braking, etc. Safety: The engine is spinning at one speed, the rear wheel typically is spinning at a higher rate of speed. When engine speed is NOT properly matched to rear wheel speed during rapid downshifting, this results in a situation called “Rear Wheel Hop”. What this means is that the rear wheel starts to hop up and down violently until the two speeds are equalized. Slipper clutches eliminate rear wheel ‘hop’, which ultimately increases the control of a motorcycle. Once the rear wheel starts to hop, it has lost contact with the ground… which means the rider has lost control of the motorcycle! If the rear wheel is hopping and loses contact with the surface, a rider may be able to slow the motorcycle, however the bike can not be turned. This can lead to an accident. If the rear wheel is allowed to freewheel, it can remain in contact with the ground and the bike can be turned. Basically, through use of a slipper clutch rea wheel hop is eliminated, control is increased which could be the difference between going through a corner and leaving the road surface.
Why use a slipper clutch off road?
Performance: It is a common misconception that a slipper clutch will have no benefit in off road conditions because the dirt will give way and the felt engine brake will be minimized. This is not true, engine braking will always be felt and more importantly it can upset the handling of the motorcycle. A slipper clutch allows the rear wheel to freewheel under rapid downshifting conditions… which leads to increased corner speed and lower lap times. Stability: Consider that every time the face of a bump or whoop section is hit, the rear wheel is torqued and opposing force is applied to the engine. This typically results in the rear of the bike being thrusted upward. This throws the front of the bike down and the result is a ‘sea-saw’ effect, or bucking back and forth. Usually the only way to combat this is to get off the gas. However, when using a slipper clutch through a difficult whoop section, as the rear tire hits the face of each whoop, the clutch is allowed to open up and keep the rear wheel spinning… this increases stability and leads directly to the bike staying level; which allows the rider to stay on the throttle. The same is true when landing a jump. As the bike flies through the air, the rear wheel may slow down. Upon landing, the rear wheel is rapidly accelerated again and opposing torque is applied to the rear wheel and subsequently the engine. The result is increased downward force on the front end. With a slipper clutch, the rear wheel is permitted to freewheel upon landing. This leads to increased stability on landing, being able to ride out of the jump faster, and often in many cases enables the rider to use softer front suspension settings for increased feel and control in other parts of the track. In addition to increasing riding benefits, STM slipper clutch systems prevent engine over-revving. Reducing engine over-rev preserves the function of engine components and leads to increased engine life.
STM INSTALLATION INSTRUCTIONS
Each STM Slipper Clutch comes complete with detailed installation instructions. In the instructions you will find an exploded view of the clutch complete with component names & individual part numbers. It is important to realize the each individual component of every STM clutch is laser engraved with it’s own individual part number for ease in reference! The instructions also include step-by-step directions including installation images, and any necessary STM specs that might be needed. In some cases the OEM spec must be adhered to, in these instances the STM instructions will indicate this.
The Evolution Slipper Clutch was the very first slipper clutch to utilize a Diaphragm spring! Of course the Evolution uses STM staples like 'Ball & Ramp' actuation for smooth slipper clutch operation, and the STM exclusive 'PEP' - Progressive Engagement Plate to decrease the abruptness during closing of the clutch. In addition, it uses a 90mm Diaphragm Primary Spring and an 85mm Diaphragm Secondary Spring. By using diaphragm springs in both the primary and secondary .. the Evolution Slipper Clutch offers superior adjustability to suit any riding style and engine modification. The primary spring controls the pressure on the clutch pack during lock up. STM 90mm diaphragm primary springs are weighted in Kilograms and offered in 10Kg increments. There are 9 different weights to choose from (sold individually). Through the use of varying weights, the engine builder can adjust the amount of pressure on the clutch pack to compensate for any engine modifications and subsequent increases in horsepower. The secondary spring is what controls the amount of engine brake. The lighter the secondary spring, the less engine brake; the heavier the secondary spring, the more engine brake. The 85mm diaphragm secondary springs are weighted in Kilograms and offered in 10Kg increments. There are 6 different weights to choose from (sold individually). Through the use of varying weights, the rider can adjust the amount of engine brake desired to fit their individual riding style.
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