Strange clutch problem
chris at chrisburgess.com
Wed Jul 1 19:29:04 PDT 2009
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.
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> kc at brgracing.com
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> -----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
> the second day.
> Ravi's SV 650 had a stuck clutch, just like a British bike. I've never seen
> 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
> I tried to break it loose by pulling in the clutch in second gear and
> the starter, but no good - the starter just pushed the bike across the
> lot. Finally I started the engine in neutral, pulled in the clutch, gritted
> teeth and jammed the shift lever into first. Just like I have to do to my
> 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
> felt normal when I pulled on the lever. But the plates were stuck together
> though the spring pressure was removed.
> In a few days the bike's coming out to my place for a clutch inspection,
> not inclined to replace the friction plates in a working clutch on a
> 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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