Quote:
Originally posted by Gizmo
Quote: Originally posted by Ducnow
Ok, i admit i don't know much about slipper clutchs. 
I see there are 48 tooth slippers, 12 tooth etc...
So, what's are the advanteges/disadvantages of a 48 tooth vs one with less tooths?
Which is best? |
I've just asked a friend who was sales manager at STM exactly that question last week. Slipper was for 999 and I also asked about different size slave cylinders for the 999 and MTS, this is for majority road use with occasional track days, heres his reply
On the tech side I recommend the 48 teeth basket and plate kit. Z 48 have three times more contact suface between basket and plates allowing a much more precise fit and MUCH longer life. Moreover the sintered material of the Z-48 plates is exactly the same used in competition and has a long life as well as great friction coefficient.
All STM clutches are available with 12 or 48 basket, I highly recommend the 48. The advantage of the 12 is that you can use your old plates but the function is not as good as with the special STM 48 plates. priod.
Regarding the clucth model I suggest the EVOLUZIONE (003MG048/45°+ D). It has a diaphragm spring (degressive action on the lever) and would fit weel with the bike and how you use it. Choose the 45° ramp angle that works fine on the road and for "occasional" track rides. The 35° ramp angle is more for racing with highly compressed engines. Basically with lower ramp angle (35°) you reduce engine brake a lot that maybe is too much for road use.
Slave cylinders should be 28 on the 999 and 30 on the Multistrada. The diameter depends on the master cyl as well, generally you can increse 2mm on the diameter compared to original. Increasing the diameter of the slave you reduce at the same time the travel of the pushrod, with all STM clutches with diaphragm spring releasing the plates is easier than standard coil spring clutches, so if you choose an STM Evoluzione you can increase the diameter of the slave without any problem of drag.
If you look for the ultimate racing product the clutch to buy is the Evoluzione Racing (003MG101/45+D), is the same clutch used by all top riders in the world, it is more expensive especially because it uses a bigger diameter diaphragm spring and some slighlty different features. Compared to the EVOLUZIONE the lever will be even smoother.
Do not forget to ask for the special push rod pin (044MG001). It is a simple part but VERY useful.
There is only 1 tool that you need to hold the pusher plate while tightning the main nut on the clutch: 002AMH001. A good mechanic can also do it without the tool. |
Still think its horrible, for what my opinions worth!
If its that good, why do the racers all use the 12 tooth 6 or 4 posts?