Sprag Clutch Replacement C5 2010

[singhg5]

The Stieber sprag fits, its exactly the same size.  In fact it appears to be identical in every way, so I dont know if it's any stronger than OEM.  My sprag must have been slipping for a lot longer than I noticed because I'm surprised how fast my C5 stars now.  I'll have to see how long it lasts.  

Good to know that it your Stieber sprag fits perfectly and the bike is running well.

Any pictures of the new one ?  Where did you buy it from ?

[Ducati Scotty]

How much did the new sprag cost?

Scott

[JesterNT]

I did not take any photos    I thought of that after I had the engine cover back on already.  It looked exactly like the original PN 560011in every way, aside from the fact it wasn't shredded into tiny bits on my workbench.

It cost $71  searched for a local dealer on the US importers site http://www.formsprag.com/distributorframe.htm There were two local dealers in the Oklahoma City area, nether had it in stock.  FLECK BEARING CO quoted me $71 the other company was at $83.  Fleck drop shipped it to me from their supplier for $7 + tax worked out to $82.97.  Now that I think of it, thats probably why the first company quoted me $83??

Any way I put about 80 miles in the new sparg with no issues yet.

[jartist]

How much do you suppose the sprag weighed?

[JesterNT]

3 or 4 oz

[iron.head]

Old Classic 500 sprag which failed on many bikes-


New C5 sprag which has not been reported to have failed on any bikes in India yet-

[jartist]

Wow! That really does look like a robust sprag!

[Arizoni]

Thanks for the great pictures iron.head
They bring up the question for JesterNT, does your new clutch look like the upper (old) clutch or the lower (new) clutch?

[Ducati Scotty]

I like that the new clutch has that spring band going down the middle of the sprags.  That tends to keep them tucked out of harm's way unless there's enough centrifugal force to engage them.  It also has they wavy wire cage to keep them located, more flexible than the solid sheet steel style cage that can shatter when the engine kicks back.

Scott

[singhg5]

The sprag clutch that Jester got from Stieber looks like the older clutch (upper one), as if they supplied to RE ! -

http://www.stieber.de/pdf/stieber/DC-product-en.pdf

[Ducati Scotty]

Hmmm, wonder if there are different styles available in the same size/spec?

Scott

[singhg5]

I like that the new clutch has that spring band going down the middle of the sprags.  That tends to keep them tucked out of harm's way unless there's enough centrifugal force to engage them.  It also has they wavy wire cage to keep them located, more flexible than the solid sheet steel style cage that can shatter when the engine kicks back.
Scott

Scott - Did you write this article on sprag on Ducati website ?

http://www.mad-ducati.com/Technical/StarterSpragClutch/SpragClutch.html

[Ducati Scotty]

No, but I read it recently.  Good info.

The Ducati failures (like BMW) seem to be related to the sprag not engaging.  With RE it's the danger of kickback.  This is more prevalent on the pre-UCE bikes but mine failed after charging system problems drained my batteries giving weak starts with several kickbacks.  I don't think that's a coincidence.

Scott

[Kevin Mahoney]

Yes and no. On Iron-Barrels and AVL's kick back can be a big deal. On the UCE it is more an issue of not engaging. Because of the EFI they rarely if ever kick back. Even if one does the design of the sprag mechanism (meaning not only the sprag but the associated gears) are different.

[Ducati Scotty]

Thanks for the clarification Kevin.

Scott