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SUPERMOTO WET SLIPPER CLUTCH STM FOR YAMAHA YZ/WR-F 426 2000-2002

SUPERMOTO WET SLIPPER CLUTCH STM FOR YAMAHA YZ/WR-F 426 2000-2002 View larger
EMBRAGUE ANTIREBOTE STM SUPERMOTARD PARA YAMAHA YZ/WR-F 426 2000-2002

FYA-M040

Delivery available in 6-7 working days


SPRING FUNCTIONING

Primary spring:

• It makes pressure on the disc pack through the pressure plate;
• It replaces the helicoidal springs

Secondary spring:
• it makes pressure on the drum;
• it regulates the opening of the slipper clutch and regulates the engine brake.

Spring functioning
The primary and secondary springs are pre-loaded in order to generate an initial elastic strength of contrast.

Primary spring functioning
When you operate the clutch lever, the primary spring is compressed. The spring releases an elastic strength of contrast to the lever movement. The next chart shows how the spring load varies with its compression.

Secondary spring functioning
The engine brake makes the drum rotate and shift outwards causing the discs to disengage. The secondary spring is compressed in comparison with the initial resting position and generates an elastic strength of contrast. This strength is described in the following graphic.

Primary spring load/compression chart
The origin of axes corresponds to the free height of the spring, i.e when the spring is not loaded. Each mm of compression corresponds to an equal decreasing of the spring height.

Secondary spring load/compression chart
The origin of axes corresponds to the free height of the spring, i.e when the spring is not loaded. Each mm of compression corresponds to an equal decreasing of the spring height.

Diaphragm springs and helical springs
Operating the clutch lever, the diaphragm spring is compressed and releases a strength which is constant, if not inferior in the maximum point of the curve. STM slipper clutches use this characteristics to let the strength to be done while actioning the clutch lever constant or even inferior. The helical springs usually present in the majority of standard clutches have a curve with a linear increasing chart. When pulling the clutch lever, the helical spring is compressed and releases an increasing strengh . This means that the lever becames harder as you pull the lever.

Spring adjusting #1
In case of downshifting or violent hard breaking the rear wheel generates a back torque. This back torque causes the hub to lift up and shift disengaging the discs. The secondary spring contrasts the hub movement.
Secondary spring: its function is to press the drum against the hub. It regulates the opening of the slipper clutch to control the engine brake. According to the load (expressed in kilos) of the secondary spring, the opening of the clutch is anticipated or deferred, that is the opening arrives at inferior or superior values of back-torque. The biker feels it as low gear effect: when the clutch opening is anticipated, the biker will feel less low gear effect; when the clutch opening is deferred, the biker will feel more low gear effect.

Spring adjusting #2
The engine brake can be modified according to biker preferences by using a different secondary spring.:
If the biker desires less engine brake while entering turns, and wants low gear effect we should replace the secondary spring with a lower loaded one (less kg).
Street conditions also influence the set-up choice; different set-up can be chosen according to surface conditions:
-wet ­-dry ­-mud.
The opening of the clutch also depends on the primary spring: the drum is contrasted by the secondary spring and also by the primary spring when the pressure plate lifts up. The standard set-up of STM clutches should be the ideal one for the most riders, because it results of tests made with the most important teams in many championships. However the spring set-up can be changed according to riders preferences.

Differences between 90 mm and 125 mm primary spring
The main difference is that in the clutch with 125 mm spring, 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, being equal the pressure on the plate pack.
The slipper clutch with a 125 mm spring is an evolution of the 90 mm spring, that is still supplied.


STM SLIPPERCLUTCH TYPICAL FEATURES

Lever ticketing
Clutch lever ticketing is due to the action of the clutch pusher plate, in the moment in which it is raised under the drum pressure. In this case the rider’s fingers can feel a small ticketing, indicating the slipper clutch system is working correctly;

Racing pumped engines
In order to use STM slipper clutch on “non standard” engines, with more hp and torque, it is advisable to fit the clutch with a primary spring more loaded (+ 10 kgs.). This to avoid clutch slipping in starting phase.

WHY TO USE AN STM SLIPPERCLUTCH
“Road” use:
-To prevent engine overturning;
­ -To prevent rear wheel hopping;
­ -To enable the downshifting without use of clutch lever;
­ -To enable the controlled sliding of rear wheel;
­ -To manage clutch lever release (in bend), in order to avoid unsaddling;
­ -To allow a better clutch lever release in starting phase, due to the diaphragm spring.
“Off Road” use:
­ -To prevent engine overturning;
­ -To prevent engine components integrity, gearbox first;
­ -To avoid engine turning-off due to the holes in the track;
­ -To allow a better jump preparation;
­ -To set the shock absorber more easily and efficiently;
­ -To determine a better drive feeling with the motorbike;
­ -To allow a better clutch lever release in starting phase, due to the diaphragm spring.

How can I place an order?

  • Create an user in our website, fill in the chart and finish your order in the website. This is the fastest and easiest way.
  • You can always call us on the phone 0034 978834236 if you assistance from one of our experts with your purchase.
  • You can always contact us by email. Sending an email to info@motocrosscenter.com.

All prices have the 21% Spanish VAT included, if you live outside the EU this tax will be deducted at the final step of your purchase.


*Pictures showed may be for illustration purposes only. If you have doubts contact us: info@motocrosscenter.com.

** The availability of the outlet products depends on the current stock. Due to the limited availability and popularity of this products, the availability will be confirmed once by our comercial department once your order is placed.

FREE shippment for orders over 50€ (In Spain and Portugal).

If your order does not exceed 50 euros shipping costs will be 8 euros.

- For shipments to the Baleares Islands, the shipping will be 10 Euros , if your order exceeds 100 euros, shipping will be free.

- For shipments to the Canary Islands, Ceuta and Melilla, shipping costs will be 15 Euros with free shipping from 200 euros of order.

- If you are registered on the website as a professional client , shipping in Spain will always be 6.95 euros ( 10 euros for the Baleares Islands) and free on orders above 200 euros.

You can return a product / order during the following 30 days for equipment products and 15 days for other items, counting from the receipt of the order.

To make a return you must access Order Returns and select the products you want to return, including a brief description of the reason for the return .

If there has been an error on our part do not worry, we will pay all the cost of return.

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SUPERMOTO WET SLIPPER CLUTCH STM FOR YAMAHA YZ/WR-F 426 2000-2002

SUPERMOTO WET SLIPPER CLUTCH STM FOR YAMAHA YZ/WR-F 426 2000-2002

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Data sheet

CILINDRADA MOTO 426
Marca Moto Yamaha



Free shipping

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How much is the shipping cost ? 

- For Orders inside the Iberian Peninsula (Spain and Portugal mainland) the shipping cost would be 6,95 euro. BUT if your order total amount (exc shipping) is bigger than 50 euro, you will get FREE SHIPPING !!! (only for street customers). 

- For Orders to the Balearic Islands, the shipping cost would be 10 euro, you would get FREE SHIPPING if your Order is bigger than 100 euro.

- For Orders to the Canarian Islands, Ceuta or Melilla, the shipping cost will be calculated by the web system, although all orders to the Canary Islands, Ceuta or Melilla will be checked for weight and volume to try to adjust the shipping costs (you may be required to pay more quantity for shipping costs if your order includes very heavy or bulky products). * ATTENTION, for very heavy or very large orders (normally above 30 kg) you may be required to pay an extra shipping charge. All SHIPPING COSTS indicated above are valid only for PRIVATE CUSTOMERS (non-professionals)

- For Orders shipped OUTSIDE SPAIN AND PORTUGAL (INTERNATIONAL) the shipping would be calculated automatically by the web system depending on the weight and/or volume of the products in your shopping cart. Some examples of EUROPE shipping costs are :


>>> 9,95 EURO SHIPPING (FREE OVER 130 EURO) FOR GERMANY, FRANCE, ITALY AND UNITED KINGDOM

>>> 15 EURO SHIPPING (FREE OVER 200 EURO) FOR AUSTRIA, BELGIUM, LUXEMBURG, NETHERLANDS, POLAND, CZECK REPUBLIC, DENMARK, ROMANIA, HUNGARY

>>> 15-30 EURO SHIPPING DEPENDING ON WEIGHT FOR GREECE, IRELAND,SLOVAKIAA, ESTONIA, LATVIA, LITHUANIA, SLOVENIA, BULGARIA

>>> 15-55 EURO SHIPPING DEPENDING ON WEIGHT FOR FINLAND, SWEDEN, NORWAY, SWITZERLAND



- We ship Worldwide but the shipping costs to Countries outside Europe vary too much depending on the size of the package. Our web system will calculate the shipping cost of your order depending on the weight and/or volume of the products in your shopping cart. We can also calculate a custom shipping quote for your order here :   Contact Us or Email us ( info@motocrosscenter.com ) with the parts/products you want and your Country and we will quickly calculate a custom Shipping Quote for your order.

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>> Please NOTE: All above shipping costs are only valid for Street customers (not professionals)

- If you are registered as a Professional/Dealer in our system, the shipping inside Spain/Portugal would be 4.95 euros (10 euro for Balearic Islands) or free in orders over 200 euro. All orders for professionals/Dealers inside Europe would be 15 euro shipping cost***.

Delivery 24h / 48h

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How long does it take my order to arrive ?

Once you finish your Order we will start processing your Order, you will be contacted if there´s any problem with the Stock of any of the products in your Order. Once your order is shipped it usually takes 24h to be delivered (Spain and Portugal mainland), or 5-7 days for Europe and Islands.

When is my order going to be shipped ?

In the very next moment that your order is being shipped, you will be informed by Text Message/Email with the tracking number of your Order so you can track it from your home through the internet.

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SIZE INFO CHARTS

Below you can find the refference size charts for different brands, please find out your correct size before ordering. If you have any doubt, please contact us before ordering and we will try to help you anyway we can.

Contact us here.


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Tallaje camisetas chicos

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Tallaje pantalón chicos

- KIDS CLOTHING (YEARS APROX)-

Tallaje camisetas niño

- WOMEN AND KIDS CLOTHING -


Tallaje camisetas niño



- HELMETS -

Tallaje de cascos

- BOOTS -

Tallaje de botas

- GLOVES -

Tallaje de guantes


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