Strange clutch problem

Chris Burgess chris at chrisburgess.com
Wed Jul 1 20:00:07 PDT 2009


Um that doesn't sound bad.  I run 5w40 in mine.

On Wed, Jul 1, 2009 at 7:36 PM, KC Gager <kc at brgracing.com> wrote:

> 5w30 very light very wrong. Racer did it with out talking to me first.
> Thing
> lock up on the starting grid. Had to pull out of the race. Almost cost us
> the championship for that year
>
>
>
> The Home of A Sickness for Quickness
> K.C.  Owner of BRG Racing Products and Dyno Services
> kc at brgracing.com
> Shop # 925-680-2560
> Toll Free # 1-877-ride-brg
> Address
> 110 2nd Ave South Unit D 12
> Pacheco Ca 94553
>
>
> -----Original Message-----
> From: sv650-bounces at micapeak.com [mailto:sv650-bounces at micapeak.com] On
>  Behalf Of Chris Burgess
> Sent: Wednesday, July 01, 2009 7:29 PM
> To: Suzuki SV650 Mailing List
> Subject: Re: Strange clutch problem
>
> What oil and weight were you running when this happened?
>
> On Wed, Jul 1, 2009 at 7:15 PM, KC Gager <kc at brgracing.com> wrote:
>
> > Look at the clutch hub washer just under the clutch hub. I think u might
> > find that it's welded to the trany input shaft and the clutch hub.
> > The cause for us was to light of oil.
> >
> > The Home of A Sickness for Quickness
> > K.C.  Owner of BRG Racing Products and Dyno Services
> > kc at brgracing.com
> > Shop # 925-680-2560
> > Toll Free # 1-877-ride-brg
> > Address
> > 110 2nd Ave South Unit D 12
> > Pacheco Ca 94553
> >
> > -----Original Message-----
> > From: sv650-bounces at micapeak.com [mailto:sv650-bounces at micapeak.com] On
> > Behalf Of Jim Stewart
> > Sent: Wednesday, July 01, 2009 1:02 PM
> > To: _SV race list; _SV/DL Riders
> > Subject: Strange clutch problem
> >
> > Hi, guys -
> >
> > Last summer on a 3 day ride we had an odd problem first thing in the
> > morning
> > of
> > the second day.
> >
> > Ravi's SV 650 had a stuck clutch, just like a British bike. I've never
> seen
> > this
> > before in a Japanese bike. After starting it in neutral and pulling in
> the
> > clutch, it wouldn't disengage. Just like my BSA. It had just been sitting
> > overnight.
> >
> > I tried to break it loose by pulling in the clutch in second gear and
> > cranking
> > the starter, but no good - the starter just pushed the bike across the
> > parking
> > lot. Finally I started the engine in neutral, pulled in the clutch,
> gritted
> > my
> > teeth and jammed the shift lever into first. Just like I have to do to my
> > BSA.
> >
> > It worked, and the clutch behaved normally thereafter. No problem the
> next
> > morning, no problem since then.
> >
> > I want to emphasize that this wasn't a cable or linkage problem - the
> > clutch
> >
> > felt normal when I pulled on the lever. But the plates were stuck
> together
> > even
> > though the spring pressure was removed.
> >
> > In a few days the bike's coming out to my place for a clutch inspection,
> > but
> > I'm
> > not inclined to replace the friction plates in a working clutch on a
> > low-mileage
> > bike. Unless, of course, we find something wrong.
> >
> > Anyone else had this problem on an SV? Or any other modern bike?
> >
> > Suggestions welcome!
> >
> > ------------------
> >
> >
> > Here's my response to Ravi:
> >
> >
> >  > Ravi wrote:
> >  >> what exactly do you want me to buy?
> >  >> Also, where should I buy it from that you recommend?
> >  >>
> >
> > I wrote:
> >  >
> >  > That's a tough question.
> >  >
> >  > Am I correct that your clutch had never stuck before, and that it
> hasn't
> >  > since?
> >  >
> >  > A sticking clutch that has to be broken loose with a shock is common
> on
> >  > Brit bikes, and it's caused by a poor choice of friction material in
> the
> >  > clutch plates or a poor choice of oil. Or both. But with a Brit bike
> the
> >  > problem would typically occur after the bike had been sitting for a
> >  > while, several days or more. Not overnight, as in your case. And it
> >  > wouldn't go away after one episode.
> >  >
> >  > Furthermore, I've never heard of this problem with any Japanese bike,
> >  > old or new.
> >  >
> >  > Since the clutch operates in oil, sticking can be caused by either the
> >  > friction plates or the oil - do you recall what brand/weight oil you
> >  > were running last summer? In the absence of any other data, I'm
> inclined
> >  > to think the problem was oil related.
> >  >
> >  > Beth mentioned notched splines in the clutch basket, a problem she has
> >  > on her SV, but that wouldn't cause your problem - notches cause the
> >  > clutch to grab suddenly when engaging, but don't cause problems
> >  > disengaging.
> >  >
> >  > My inclination is to inspect the clutch first - in which case all
> we'll
> >  > need is a new O-ring for the clutch cover. But if you want we could
> >  > replace the friction plates anyway. It won't take any longer, since
> >  > we'll already have them out, but it'd be a stab in the dark at an
> extra
> >  > $110 or so.
> >  >
> >  > I recommend Ron Ayers: http://fiche.ronayers.com/ Check out the
> clutch
> >  > fiche for your bike: http://tinyurl.com/m2d66t
> >  >
> >  > Note that the drawing is incorrect - it shows a total of 8 friction
> >  > plates (the ones with the tabs on the outer edge), 7 is the correct
> >  > count. There are 6 of 21441-37440 @ 13.28 each and one of 21440-19F00
> @
> >  > $31.24. The steel plates between them don't wear - with extreme abuse
> >  > they will warp, causing drag on disengagement (not your problem).
> >  >
> >  > You will need the large O-ring for the cover, 11484-19F01, $11.18.
> >  > http://tinyurl.com/l7h5df
> >  > It's *possible* that the dealer would have this in stock. If they
> stock
> >  > anything at all anymore.
> >  >
> >  > ----------------
> >  >
> >  > This would be the appropriate time to change your oil, since we'll
> need
> >  > to drain it to work on the clutch. Unless you've just done that, in
> >  > which case we can put it back. Or work on the clutch with the bike on
> >  > the sidestand.
> >  >
> >  >
> >  > -js
> >  >
> >
> >
> >
>
>
> --
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>
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>


-- 
WERA #104
OMRRA #104
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http://www.burgiracing.com
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2009 Sponsors
I-90 Motorsports
Vortex Racing - http://www.vortexracing.com
Motorex - http://www.motorex.com
Leo Vince - http://www.leovinceusa.com
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