STM Slipper Clutch

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STM Slipper Clutch
The slipper clutch that started it all! STM Slipper Clutches are beautifully fabricated in anodized aluminum alloy and titanium. Selected for use by Ducati's World Superbike team, still the best choice for higher horsepower machines.
These are the EXACT Same STM Clutches that are used by Ben Bostrom, Noriuki Haga, Franki Chilli, and
Many other Top Road Racers World Wide.

ALL STM Clutch is made IN HOUSE at the Italy Shop, with the highest tollerance and quality control. 
Each part is stamped with a Part number, and Serial number to keep quality control and records of all part made.
This insures what you receive is only the best, everytime.

STM Slipper Clutches are Now available for most Modern   Sport Bikes.

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HOW STM Slipper Clutch Work:
After years of experience and satisfaction in the production of competition engines components, STM Slipper Clutches uses the same technology, which has been already used on dry clutches, on wet clutches, too. Result: performances get better, components lubrication increases the efficacy of the system. This system, working with steel balls and ramps, helps the pilot while turning avoiding the rear wheel to slip during an hard braking. Also if you use it on every day roads, there are some advantages: it avoids dangerous skiddings, it increases safety and protects the internal parts of the engine. It avoids extra strokes, and reduces tyre wear of the rear wheel.
All components come from STM Slipper Clutch, is  made with the most sophisticated machines.
For the production STM Slipper Clutches selects the best aeronautic alloys and the best suppliers for surface treatments. Drum and hub are realized in Ergal 7075 and oxidized to last long.
Also the pusher plate is in 7075, but it has a steel ring which gives a stiff support to the Diaphragm Evoluzione spring . This spring is the real heart: it is possible to chose between different kind of hardness and adapt the clutch to pilot's needs. Pusher plate kit, with the function of checking plates opening is completed by a brassbearing rest holder and a pusher spring hub in steel and nitride coating. This treatment helps steel components to last longer, increasing surface hardness.
STM Slipper Clutches kit assembly uses original Friction Plates, Drive Plates and basket.

Going faster in the corners is not just about HP, it's about smoothness and Traction.
It's about the riders ability to load up the tires to their limit of grip and keeping them there, just before the point they let go.
The Rider can fine tune his suspension and chassis set up to  help this situation be predictable and accurate.  What you do not want is the rear tire locking up in a high speed corner or coming into a slow, hard braking corner. The fastest way through a corner is smooth progressive deceleration and acceleration to prevent any wheel hop.

Another side effect late braking, is the chance of pushing the engine through its redline and damaging the motor. The rev limiter only works by cutting the throttle.  It doesn't work if the rear wheel is   turning the motor over at a faster speed.

That is why many newer model bikes are coming standard with "Slipper Clutches".

The point at which, the clutch releases and the level of drag designed into the clutch is setup to make a real difference to the way the engine braking affects handling and the suspension set-up required as a result. 
You can read interviews with racers developing a new racebike, quoted as saying that "The initial set-up depends on the correct adjustment of the slipper clutch, this is most important".

 

    SLIPPER CLUTCH TECHNICAL

    SPRING FUNCTIONING

    Primary spring:
    • It applies pressure on the disc pack through the pressure plate;
    • It replaces the many helicoidal springs.
    • Allows adjustment when Motor performance is increasing.

    Secondary spring:
    • it applies pressure on the drum;
    • it regulates the opening of the slipper clutch and regulates the engine braking to the wheel.
    • It allows adjustment to rider preference - The lighter the spring, the less engine brake; the heavier, the more engine brake.

    Primary Spring function:
    • The primary and secondary springs are pre-loaded in order to generate an initial elastic strength of contrast.
    • When you operate the clutch lever, the primary spring is compressed. The spring releases an elastic strength relative to the lever movement.

    Spring adjustment:
    • STM 125mm diaphragm primary springs are offered in 10Kg increments and are changed as Horsepower increases. There are 13 different weights to choose from (sold individually).
    • The 85mm diaphragm secondary springs are offered in 10Kg increments and are changed to rider preference and surface conditions. There are 6 different weights to choose from (sold individually).

    HOW DOES SPRING LOAD CHANGE WITH COMPRESSION?

    On closing the Throttle or changing down in gears, the engine's compression passes from the Cylinders to the gear box forcing the Clutch drum to rotate, with this action the secondary spring shifts the Clutch Hub outwards causing the clutch discs to disengage and moderate the compression shown at the rear wheel. The secondary spring is compressed in comparison with the initial drive and generates an elastic strength of contrast until power resumes. When power resumes to drive forward, the secondary spring to close the discs and start driving again.

    ARE STM SUPPLIED WITH A SUITABLE SPRING SET UP?

    All STM Diaphragm Slipper Clutches come with Primary & Secondary springs that have been calibrated for the specific application the clutch is intended for. The standard weight of both springs chosen by the STM Factory Technicians to be suitable for 90% of riders. One of the outstanding features of STM Slipper Clutches is that they offer a wide range of adjustment to suit any rider's needs. Both Primary & Secondary springs (weighted in Kilograms) are offered in 10kg increments and sold individually. Riders & engine builders can purchase additional springs to find the perfect combination to suit the rider preference and Horsepower output.

    ARE THEY THAT GOOD FOR OFF-ROAD USE?

    The STM Off-Road Wet Slipper Clutch is specifically designed for 250cc & 450cc four-stroke wet clutch applications. The clutch uses the cornerstone of STM technology, the 'Ball & Ramp' actuation for smooth slipper clutch operation along with STM's exclusive 'Forced Lubrication System' (FLS). STM developed the Forced Lubrication System to increase the amount of engine oil flowing through the wet clutch, this leads to cooler running temperatures and cleaner conditions therefore increasing the performance and longevity of the clutch components. In addition, the STM Off-Road Wet Slipper Clutch uses a 121mm Diaphragm Primary Spring and an 85mm Diaphragm Secondary Spring. By using diaphragm springs in both the primary and secondary positions the STM Off-Road Wet Slipper Clutch offers superior adjustability to suit any riding style and engine modification.

    DIFFERENCE BETWEEN 90mm & 125mm PRIMARY SPRING.

    The main difference is that with the 125 mm spring clutch, the elastic action of the spring is applied right on the disc pack. With the 90mm spring the pressure is not direct on the plates, because the spring is positioned in the centre of the clutch. The advantage of 125 mm spring is to give a softer clutch lever. The slipper clutch with a 125 mm spring is a later version of the 90 mm spring Slipper Clutch.


     

    ABOUT STM.

    STM's slipper clutch represents a huge change in motorcycle technology and rider technique and thanks to STM innovative ideas, worldwide success for the riders using the STM product. Thanks to the competence and lengthy experience gained designing and machining high quality components, the company has became the LEADER in the performance CLUTCH market segment. Thanks to STM, the slipper clutch era had begun.

    The first STM slipper clutch prototypes were originally developed and tested with the Official Ducati World SBK Team. These prototypes soon contributed to the victory of two World SBK Championships.

    Development and tests carried out in the following years allowed STM to extend such technology to wet clutches. In 2003 the "Evoluzione" slipper clutch technology was applied to wet clutch systems on Japanese motorcycles, widely broadening its range of applications with cooperation with top Honda, Suzuki, Yamaha, and Kawasaki teams that compete in sport production competitions. This allowed STM to gain experience and improve its product. Then STM debuted in Motocross and Supermotard meetings with unanimous approval and contributing to the victory in many races.

    Today STM offers a broad range of products which are constantly being tested and improved in order to satisfy the requirements of a growing number of riders. Developed and tested in cooperation with top teams, all STM components are designed with the latest technologies and manufactured with the most advanced CNC machinery.

    STM "Evoluzione" clutches stand out for their technologic and highly innovative design: shaped by their own function to essential lines, they are precious objects, a state of the art expression of Italian design.


STM Slipper Clutches  Pricing. 

 

PART# PRODUCT DESCRIPTION RETAIL SALE PRICE
FAP-X020

APRILIA     SXV/ RXV/ MXV 4.5/ 5.5      2005+

$1350 $978.45
FAP-M020 APRILIA      SUPERMOTO WET SLIPPER CLUTCH   
SXV/ RXV/ MXV 4.5/ 5.5   2005+ 		$1350 $978.45
FGG-X010

GAS GAS   EC450   2010-2013

$1350 $978.45
FGG-M010 GAS GAS  SUPERMOTO WET SLIPPER CLUTCH
 EC450   2010-2013 		$1350 $978.45
FHN-X010

HONDA    CRF 250       2003+

$1350 $978.45
FHN-M010 HONDA     SUPERMOTO WET SLIPPER CLUTCH
CRF 250       2003+ 		$1350 $978.45
FHN-X020

HONDA   CRF 450   PRIMARY SPRING 90 MM   2002-2008

$1350 $978.45
FHN-M020 HONDA  SUPERMOTO WET SLIPPER CLUTCH
 CRF 450  PRIMARY SPRING 90 MM   2002-2008 		$1350 $978.45
FHN-X030

HONDA    CRF 450   PRIMARY SPRING 125 MM    2002-2008

$1350 $978.45
FHN-M030 HONDA  SUPERMOTO WET SLIPPER CLUTCH
  CRF 450   PRIMARY SPRING 125 MM    2002-2008 		$1350 $978.45
FHN-X040

HONDA     CRF 450 X      2005+

 $1350 $978.45
FHN-M040 HONDA  SUPERMOTO WET SLIPPER CLUTCH
  CRF 450 X      2005+		 $1350 $978.45
FHN-X090

HONDA    CRF 450    2009-2012

$1350 $978.45
FHN-M090 HONDA  SUPERMOTO WET SLIPPER CLUTCH
  CRF 450    2009-2012 		$1350 $978.45
FHN-X120

HONDA    CRF 450   2013+

 $1350 $978.45
FHN-M120 HONDA   SUPERMOTO WET SLIPPER CLUTCH
 CRF 450   2013+		 $1350 $978.45
FHQ-X010

HUSQVARNA     TE 450   2004-2007

$1350 $978.45
FHQ-M010 HUSQVARNA  SUPERMOTO WET SLIPPER CLUTCH
   TE 450   2004-2007 		$1350 $978.45
FHQ-X010 HUSQVARNA  TC 450   2004-2007 $1350 $978.45
FHQ-M010 HUSQVARNA SUPERMOTO WET SLIPPER CLUTCH
  TC 450   2004-2007 		$1350 $978.45
FHQ-X010 HUSQVARNA  SM 450 R   2004-2007 $1350 $978.45
FHQ-M010 HUSQVARNA   SUPERMOTO WET SLIPPER CLUTCH
SM 450 R   2004-2007 		$1350 $978.45
FHQ-X010 HUSQVARNA  TE 510   2004-2007 $1350 $978.45
FHQ-M010 HUSQVARNA  SUPERMOTO WET SLIPPER CLUTCH
 TE 510   2004-2007 		$1350 $978.45
FHQ-X010 HUSQVARNA  TC 510   2004-2007 $1350 $978.45
FHQ-M010 HUSQVARNA  SUPERMOTO WET SLIPPER CLUTCH
 TC 510   2004-2007 		$1350 $978.45
FHQ-X020 HUSQVARNA  SM 630 R   2004-2007 $1350 $978.45
FHQ-M020 HUSQVARNA  SUPERMOTO WET SLIPPER CLUTCH
SM 630 R   2001-2007 		$1350 $978.45
FHQ-X030 HUSQVARNA  TE 450   2008+ $1350 $978.45
FHQ-M030 HUSQVARNA  SUPERMOTO WET SLIPPER CLUTCH
 TE 450   2008+ 		$1350 $978.45
FHQ-X030 HUSQVARNA  TC 450   2008+ $1350 $978.45
FHQ-M030 HUSQVARNA  SUPERMOTO WET SLIPPER CLUTCH
 TC 450   2008+ 		$1350 $978.45
FHQ-X030 HUSQVARNA  SM 450 R   2008+ $1350 $978.45
FHQ-M030 HUSQVARNA SUPERMOTO WET SLIPPER CLUTCH
 SM 450 R   2008+ 		$1350 $978.45
FHQ-X030 HUSQVARNA  SM 450 RR   2008+ $1350 $978.45
FHQ-M030 HUSQVARNA SUPERMOTO WET SLIPPER CLUTCH
 SM 450 RR   2008+ 		$1350 $978.45
FHQ-X030 HUSQVARNA  TE 510   2008+ $1350 $978.45
FHQ-M030 HUSQVARNA SUPERMOTO WET SLIPPER CLUTCH
 TE 510   2008+ 		$1350 $978.45
FHQ-X030 HUSQVARNA  TC 510   2008+ $1350 $978.45
FHQ-M030 HUSQVARNA SUPERMOTO WET SLIPPER CLUTCH
 TC 510   2008+ 		$1350 $978.45
FHQ-X030 HUSQVARNA  SM 510 R   2008+ $1350 $978.45
FHQ-M030 HUSQVARNA SUPERMOTO WET SLIPPER CLUTCH
 SM 510 R   2008+ 		$1350 $978.45
FHQ-X030 HUSQVARNA  SM 530 RR   2008+ $1350 $978.45
FHQ-M030 HUSQVARNA SUPERMOTO WET SLIPPER CLUTCH
 SM 530 RR   2008+ 		$1350 $978.45
FHQ-X030 HUSQVARNA  TE 610 IE   2000+ $1350 $978.45
FHQ-M030 HUSQVARNA  SUPERMOTO WET SLIPPER CLUTCH
 TE 610 IE   2000+ 		$1350 $978.45
FHQ-X030 HUSQVARNA  SM 610 IE   200+ $1350 $978.45
FHQ-M030 HUSQVARNA  SUPERMOTO WET SLIPPER CLUTCH
 SM 610 IE   200+ 		$1350 $978.45
FHQ-X040 HUSQVARNA   TE 250   2010+ $1350 $978.45
FHQ-M040 HUSQVARNA  SUPERMOTO WET SLIPPER CLUTCH
 TE 250   2010+ 		$1350 $978.45
FHQ-X040 HUSQVARNA  TC 250   2010+ $1350 $978.45
FHQ-M040 HUSQVARNA  SUPERMOTO WET SLIPPER CLUTCH
 TC 250   2010+ 		$1350 $978.45
FHQ-X040 HUSQVARNA  TE 310   2011+ $1350 $978.45
FHQ-M040 HUSQVARNA  SUPERMOTO WET SLIPPER CLUTCH
TE 310   2011+ 		$1350 $978.45
FHQ-X050 HUSQVARNA  TE/ TC 449   2011+ $1350 $978.45
FHQ-X050 HUSQVARNA  TE/ TC 511   2011+ $1350 $978.45
FHQ-M050 HUSQVARNA  SUPERMOTO WET SLIPPER CLUTCH 
SM 449/ 511 SMR  2011+		 $1350 $978.45
FHS-X030 HUSABERG  FS/ FE 450/ 550/ 650    2004-2008 $1350 $978.45
FHS-M030 HUSABERG SUPERMOTO WET SLIPPER CLUTCH
 FS/ FE 450/ 550/ 650    2004-2008 		$1350 $978.45
FHS-X030 HUSABERG   FS/ FE 501     2004 $1350 $978.45
FHS-M030 HUSABERG SUPERMOTO WET SLIPPER CLUTCH
  FS/ FE 501     2004		 $1350 $978.45
FHS-X040 HUSABERG     FE 450/ 570    2009+ $1350 $978.45
FHS-M040 HUSABERG   SUPERMOTO WET SLIPPER CLUTCH
   FE 450/ 570    2009+ 		$1350 $978.45
FKT-X010 KTM   250 EXC-F/ XC    2006+ $1350 $978.45
FKT-M010 KTM  SUPERMOTO WET SLIPPER CLUTCH
  250 EXC-F/ XC    2006-08		 $1350 $978.45
FKT-X010 KTM  250 SX-F   2006+ $1350 $978.45
FKT-M010 KTM SUPERMOTO WET SLIPPER CLUTCH
 250 SX-F   2006-08		 $1350 $978.45
FKT-X020 KTM   450    2003-2005 $1350 $978.45
FKT-M020 KTM  SUPERMOTO WET SLIPPER CLUTCH
 450    2003-2005 		$1350 $978.45
FKT-X020 KTM   525   2003-2005 $1350 $978.45
FKT-M020 KTM  SUPERMOTO WET SLIPPER CLUTCH
 525   2003-2005 		$1350 $978.45
FKT-X030 KTM   450 EXC    2006-2007 $1350 $978.45
FKT-M030 KTM  SUPERMOTO WET SLIPPER CLUTCH
 450 EXC    2006-2007 		$1350 $978.45
FKT-X030 KTM   450 SMR   2006-2007 $1350 $978.45
FKT-M030 KTM  SUPERMOTO WET SLIPPER CLUTCH 
450 SMR   2006-2007 		$1350 $978.45
FKT-X030 KTM   525 EXC    2006-2007 $1350 $978.45
FKT-M030 KTM  SUPERMOTO WET SLIPPER CLUTCH
 525 EXC    2006-2007 		$1350 $978.45
FKT-X030 KTM   560 SMR    2006-2007 $1350 $978.45
FKT-M030 KTM  SUPERMOTO WET SLIPPER CLUTCH
 560 SMR    2006-2007 		$1350 $978.45
FKT-X030 KTM   630 SMR    2006-2007 $1350 $978.45
FKT-M030 KTM  SUPERMOTO WET SLIPPER CLUTCH
  630 SMR    2006-2007 		$1350 $978.45
FKT-X050 KTM   450 SX-F    2007-2012   $1350 $978.45
FKT-M050 KTM  SUPERMOTO WET SLIPPER CLUTCH
 450 SX-F    2007-2012 		$1350 $978.45
FKT-X050 KTM   505 SX-F    2007-2013 $1350 $978.45
FKT-M050 KTM  SUPERMOTO WET SLIPPER CLUTCH
  505 SX-F    2007-2013 		$1350 $978.45
FKT-X060 KTM   LC4/ 660    2000-2007 $1350 $978.45
FKT-M060 KTM  SUPERMOTO WET SLIPPER CLUTCH
  LC4/ 660    2000-2007 		$1350 $978.45
FKT-X070 KTM   450 EXC/ XC    2008-2011 $1350 $978.45
FKT-M070 KTM  SUPERMOTO WET SLIPPER CLUTCH
 450 EXC/ XC    2008-2011 		$1350 $978.45
FKT-X070 KTM   450 EXC SIX DAYS    2008-2011 $1350 $978.45
FKT-M070 KTM  SUPERMOTO WET SLIPPER CLUTCH
 450 EXC SIX DAYS    2008-2011 		$1350 $978.45
FKT-X070 KTM    530 EXC/ XC     2008-2011 $1350 $978.45
FKT-M070 KTM  SUPERMOTO WET SLIPPER CLUTCH
   530 EXC/ XC    2008-2011  		$1350 $978.45
FKT-X070 KTM    530 EXC SIX DAYS     2008-2011 $1350 $978.45
FKT-M070 KTM  SUPERMOTO WET SLIPPER CLUTCH
  530 EXC SIX DAYS     2008-2011 		$1350 $978.45
FKT-X080 KTM    450 SMR     2008+ $1350 $978.45
FKT-M080 KTM   SUPERMOTO WET SLIPPER CLUTCH
 450 SMR     2008+ 		$1350 $978.45
FKT-X090 KTM   350 SX-F    2011+ $1350 $978.45
FKT-M090 KTM  SUPERMOTO WET SLIPPER CLUTCH
  350 SX-F    2011+ 		$1350 $978.45
FKW-X010 KAWASAKI   KX 250 F     2005+ $1350 $978.45
FKW-M010 KAWASAKI  SUPERMOTO WET SLIPPER CLUTCH
 KX 250 F     2005+ 		$1350 $978.45
FKW-X020 KAWASAKI    KX 450 F     2006+ $1350 $978.45
FKW-M020 KAWASAKI   SUPERMOTO WET SLIPPER CLUTCH
 KX 450 F     2006+ 		$1350 $978.45
FSU-X010 SUZUKI  RM-Z 250   2004-2006 $1350 $978.45
FSU-M010 SUZUKI  SUPERMOTO WET SLIPPER CLUTCH 
RM-Z 250   2004-2006 		$1350 $978.45
FSU-X020 SUZUKI  RM-Z 450   2005-2007 $1350 $978.45
FSU-M020 SUZUKI  SUPERMOTO WET SLIPPER CLUTCH 
RM-Z 450   2005-2007 		$1350 $978.45
FSU-X030 SUZUKI  DRZ 400   2000-2009 $1350 $978.45
FSU-M030 SUZUKI  SUPERMOTO WET SLIPPER CLUTCH  
DRZ 400   2000-2009 		$1350 $978.45
FSU-X090 SUZUKI  RM-Z 250   2007+ $1350 $978.45
FSU-M090 SUZUKI   SUPERMOTO WET SLIPPER CLUTCH
RM-Z 250   2007+ 		$1350 $978.45
FSU-X100 SUZUKI  RM-Z 450   2008+ $1350 $978.45
FSU-M100 SUZUKI  SUPERMOTO WET SLIPPER CLUTCH 
RM-Z 450   2008+ 		$1350 $978.45
FTM-X010 TM  450/ 520   2011+ $1350 $978.45
FTM-M010 TM  SUPERMOTO WET SLIPPER CLUTCH 
450/ 530   2011+ 		$1350 $978.45
FYA-X010

YAMAHA  YZ/ WR 250 F   2001-2007

$1350 $978.45
FYA-M010 YAMAHA SUPERMOTO WET SLIPPER CLUTCH 
YZ/ WR 250 F   2001-2007 		$1350 $978.45
FYA-X020

YAMAHA   YZ 450 F   PRIMARY SPRING 90 MM   2003-2006

$1350 $978.45
FYA-M020 YAMAHA SUPERMOTO WET SLIPPER CLUTCH
  YZ 450 F   PRIMARY SPRING 90 MM   2003-2006 		$1350 $978.45
FYA-X020

YAMAHA  WR 450 F  PRIMARY SPRING 90 MM   2003-2008

$1350 $978.45
FYA-M020 YAMAHA SUPERMOTO WET SLIPPER CLUTCH
 WR 450 F  PRIMARY SPRING 90 MM   2003-2008 		$1350 $978.45
FYA-X030

YAMAHA   YZ 450 F  PRIMARY SPRING 125 MM   2003-2006

$1350 $978.45
FYA-M030 YAMAHA  SUPERMOTO WET SLIPPER CLUTCH
  YZ 450 F  PRIMARY SPRING 125 MM   2003-2006 		$1350 $978.45
FYA-X030

YAMAHA  WR 450 F  PRIMARY SPRING 125 MM   2003-2008

$1350 $978.45
FYA-M030 YAMAHA  SUPERMOTO WET SLIPPER CLUTCH
WR 450 F  PRIMARY SPRING 125 MM   2003-2008 		$1350 $978.45
FYA-X040

YAMAHA  YZ/ WR 426 F      2000-2002  

$1350 $978.45
FYA-M040 YAMAHA SUPERMOTO WET SLIPPER CLUTCH
 YZ/ WR 426 F      2000-2002   		$1350 $978.45
FYA-X120

YAMAHA  YZ / WR 450 F      2007+

$1350 $978.45
FYA-M120 YAMAHA  SUPERMOTO WET SLIPPER CLUTCH
 YZ / WR 450 F      2007+ 		$1350 $978.45
FYA-X150

YAMAHA  YZ/ WR 250 F   2008+

$1350 $978.45
FYA-M150 YAMAHA    SUPERMOTO WET SLIPPER CLUTCH
YZ/ WR 250 F/X  2008+		 $1350 $978.45


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