RE: [ST] Slipper clutch

["Heyer, Matthew A." <mheyer@xxxxxxxxx>]

A slipper clutch usually uses a vacuum mechanism to keep the clutch from
fully engaging on downshifts.  It is like riding the clutch during hard
downshifting in order to prevent the rear wheel from locking up due to the
engine braking.  I can't spew out all the technical details off the top of
my head, but the way the vacuum is set up, it creates the pressure to
relieve some of the force of the clutch plate meshing with the drive train
during the slowing down of the bike, but has no effect during acceleration.

I rode an '03 Aprilia Mille that has one.  They employ it as there is a ton
of engine braking with that twin cylinder engine, and it sounds cool to say
that the technology is on the bike.  I've definitely briefly locked the rear
wheel under downshifts, but it can be avoided in most situations with proper
throttle and clutch control.  I think it's like ABS (not to start another
argument) in that it is designed to idiot proof the operation.

Matt


- -----Original Message-----
From: colt4530@xxxxxxxxxxx [mailto:colt4530@xxxxxxxxxxx] 
Sent: Wednesday, July 16, 2003 12:22 PM
To: ST@xxxxxxxxxxxxxx
Subject: RE: [ST] Slipper clutch


I believe it is a ratchet-like mechanism that releases to prevent the rear
wheel from "pushing" the engine.  for instance, a bike so equiped would hace
little, or no, engine braking going downhill.  Two-strokes behave this way.
The result is you can downshift headed for a turn and not slide the tire if
you downshift too early.

John Albright
'02 RS

Original Message:
- -----------------
From: Masiak, Richard Richard_Masiak@xxxxxxxxxxxxxxxx
Date: Wed, 16 Jul 2003 09:11:12 -0400
To: ST@xxxxxxxxxxxxxx
Subject: RE: [ST] Slipper clutch


I did some searching for "slipper clutches".  Couldn't find an explaination
suitable for the mechanically impaired.

This is a sales pitch I found on the STM website:
"STM patented system avoids the rear wheel blocking in detached phase. With
the clutch automatic mechanism, the pilot is not obliged to keep his finger
on the left lever in detached phase to make the clutch slide and can
concentrate on other driving phases."

But I still don't understand what they mean.  Could someone please elaborate
on what at "slipper clutch" is and why someone would want one.

Rich


- -----Original Message-----
From: Steven Kohlscheen [mailto:TrumpST@xxxxxxxxxxx]
Sent: Wednesday, July 16, 2003 8:51 AM
To: ST@xxxxxxxxxxxxxx
Subject: Re: [ST] Slipper clutch


James Goldston wrote:
> Has anyone know here put a slipper clutch on
> their Sprint?

I've been on the list since 1999.  I don't remember anyone ever doing this
with a Sprint ST.  I have to agree with Chuck, an instructive trackday, or
riding school, would probably do more good.

Steven "Dirty Dawg" Kohlscheen

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