I had pretty much the same thing happen to me. I was just starting out
pulling a small hill in front of my house when the chain let go.
Unknown to me the keeper had worn teeth from moving back and forth. This
let the sprocket move back and forth on the counter shaft. Luckily the
chain just rolled off the sprocket onto the ground, however, during the
time the sprocket was loose it let the chain rub a hole in the vertical
cylinder's exhaust header. I was lucky that no other damage was done.
I now replace the sprocket keeper with every new chain. I also believe
that chain alignment could of had something to do with the keeper
wearing out. I now go to great pains to get my chain perfectly aligned.
Gary '01 ST4 Gaston, OR
On 1/26/2011 9:35 PM, ducati5555@aol.com wrote:
>
> The inner teeth on the keeper wear out and then it doesnt "keep" the
> sprocket from moving outward on the splined shaft. Had the teeth fail
> on mine. It was still bolted securely to the sprocket but was
> worthless. I was coming back from the Madness in Torrey, Utah
> bombing through Nevada at times exceeding 140 mph. Scary stuff. I
> got to Sacramento and drive chain had rubbed against the clutch slave
> cylinder, grinding off the tangs that hold the master link onto the
> chain. Masterlink let go and shortly their after lost the chain.
> Luckily I was leaving a stop sign. Had it let go at 140 mph, oh man
> would have been ugly. ALWAYS, ALWAYS replace the keeper with a new
> one when you replace the chain.
> Mike
> www.emsduc.com
>
>
>
> -----Original Message-----
> From: Robert McNabb <rockingm_50remuda@yahoo.com>
> To: ST Owners <st2_owners@yahoogroups.com>
> Sent: Wed, Jan 26, 2011 5:26 pm
> Subject: [DucatiST] Counter shaft sprocket keeper
>
> what's up with the poorly designed counter shaft sprocket keeper?
>
> I replaced mine last year I think with a new one, or maybe the year
> before.
> 12,000 miles max and it's toasted again.
>
> Has anyone designed their own?
> I'm thinking a heavy duty snap ring, like I use on my backhoe buckets,
> would last much longer and do as good a job.
> But, it would of course have to fit the groove tightly so as not to
> spin and
> saw the end of the counter shaft off.
>
> Any other ideas or is the current keeper the best? __________________
>
> Robert McNabb
> Blue Ridge Mountains, Virginia
> ST4 1999 RED
>
>
>
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