RE: [ST] ST transmission/chain 'catch'

["David Pullen" <dpullen@xxxxxxxxxxx>]

The sprockets are both snug, the swing-arm moves only in the way it is
supposed to.  The chain did need a lube job, so I went ahead and did that.

I measured the movement of the chain (with bike on it's center stand), and
it only moved by about 1".  The service manual called for 1.4-1.6", so I
adjusted the eccentric to allow this.  I found that 1.5" of play allowed the
chain to slap against the bottom side of the swing arm!  A "clunk" of a
different - and bad - kind.  So I tightened it back up to about 1".

While I had it up, I adjusted the suspension settings to tighten them up
(not very scientific, I know, adjusting so many variables at once).

Now, after a quick ride around, the 'catch' seems to be all but gone.  Maybe
that's me adjusting my throttle control now that I'm looking for it, maybe
it was the chain lube, maybe it was the chain and suspension
adjustment...who knows?

I'll keep an ear out for it over the next week or two and see how it goes.

Thanks for the help and advice!

  - Dave

- -----Original Message-----
From: owner-st@xxxxxxxxxx [mailto:owner-st@xxxxxxxxxx] On Behalf Of David
Pullen
Sent: Sunday, December 07, 2003 8:25 AM
To: ST@xxxxxxxxxxxxxx
Subject: RE: [ST] ST transmission/chain 'catch'


Thanks Jim and Ken; I'll give all of these a look today.

  - Dave

- -----Original Message-----
From: owner-st@xxxxxxxxxx [mailto:owner-st@xxxxxxxxxx] On Behalf Of James
LaPoint
Sent: Sunday, December 07, 2003 7:50 AM
To: ST@xxxxxxxxxxxxxx
Subject: Re: [ST] ST transmission/chain 'catch'


Actually, you might want to check to see if the chain is too tight.  We 
were riding this summer with a group and one of the members reported 
similar symptoms.  Noisy at low speed..clunking. When we checked, the 
chain was too tight. After loosening a bit, all noises went away.

Don't go by "feel" measure it.
Jim



On Saturday, December 6, 2003, at 07:36 PM, Ken Mitchell wrote:

> Not common, David, but it shouldn't be there. What I'd do right away 
> if I
> were you is double check the chain for looseness, put the bike up on the
> center stand and check for tight spots (as in, does the chain need a 
> lube
> job?)
>
> Next, remove the front (countershaft) sprocket cover and check to make
> certain that sprocket is fastened snugly. Do the same for the rear, 
> plus the
> axle nut torque setting.
>
> The only thing in the final drive that you can't inspect without some
> disassembly would be the cush drives in the rear hub and within the
> countershaft sprocket. (That front one is the chief reason I always use 
> and
> recommend Triumph OEM replacement sprockets, BTW.)
>
> With a chain drive, this area is the most frequent source of drive line
> clunks.
>
> Good luck!
>
> Ken M.
> '00 RS
> Spencer MA USA (also now buried in the season's 1st significant 
> snowfall.)
>
> -----Original Message-----
> From: David Pullen
> Subject: [ST] ST transmission/chain 'catch'
>
> Hi all,
>
> In riding around today, I was reminded of an oddity in the behavior of 
> my
> ST, and wanted to see if this is common or not.
>
> When I am coasting with the clutch engaged or using transmission 
> braking,
> and then I start on the accelerator, there is a discernable 'clunk' and
> catch in the driveline.  This is very pronounced in lower gears.
>
> I don't believe my chain is loose; there is no noticeable sag anywhere.
>
> If I have the clutch disengaged and then start on the throttle, I don't
> believe I get the same behavior.
>
> Does anyone else experience this?  Is this just the nature of a 
> chain-driven
> bike?  This is my first, so I don't really have anything to base a
> comparison on.
>
> Thanks,
>   - Dave
>
> '03 ST
>
>
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