[Ducati] Changing rear sprockets

[Barry]

Hey Gary

I did this change to my 748. I picked up the Quick change carrier and 41 and
42 sprockets from Sprocket specialists. I then ordered a new 520 DID racing
chain from Hard Racing.com. You will need a new chain especially with the
increased sprocket sizes.

I did this a couple of years ago. Initially keep the bike off the rear stand
and lean it up against a wall, or have a friend hold the bike. Put the bike
in gear and have the friend hold the back brake. I did it myself ( being I
have no friends , that's what my wife tells me ) I just leaned it up against
the wall and blocked the front wheel so it couldn't move. Then take off the
cir clip off the sprocket nut. Remove the nut, it's torqued pretty tight so
it will take some work. I use an impact wrench. Once it is loose, put the
bike back on the rear stand ( you can pick up a couple of axle jacks. There
very cheap about $40.00, and place one under each side of the base of the
foot pegs where it mounts to the frame). and loosen the rear wheel bearing
holder clamp bolts ( for tightening and loosening the chain). Then adjust
the eccentric to loosen the chain. After that the sprocket assembly will
slip right off of the stub axle.

Once you have the sprocket assembly off, this is the fun part. You need a
big size allen socket ( I forget the size ) and a box end wrench on the nut
end of the cush drive bolts. It's good to have one other person holding the
bolt while you torque off the nut. I used the space between the 2 by 4's in
the my house deck just to have some way of holding the sprocket while
torquing off the nut. Once there off putting the quick change carrier on is
quite straight forward. Just remove the cush drive bushes out of the old
sprocket and put them into the new carrier. Torque them to the specified
torque ( 48nm = 35.4 ftlbs ) Fit the carrier on the axle stub and torque her
up to 156nm = 115 ftlbs.( You'll have to torque it off the stand back on the
ground in gear again). Fit the new chain on and make sure you allow enough
chain for all the different sizes of sprockets you wish to use. Also make
sure the eccentric is able to move between 4:00 and 6:30 position with all
your sprockets, and adjust your ride height every time you change your
sprocket, ride height will be way out otherwise which affects handling. Mine
is set to accomadate  39, to 41 sizes. It sounds like a lot of work but it
isn't, and it is well worth it. Much better drive where you want it.
Hope this helps.

Barry




On 2/8/08 7:21 AM, "Gary Collins" <gary.collins at analog.com> wrote:

> Hi - I'm looking at changing out my rear sprocket with an AFAM quick
> change unit on my 748S.  I have the repair manual, but it doesn't go
> into great detail on how to do it.  My main question is do you have to
> unload the rear wheel to get the sprocket off?  I don't have an
> auxilliary stand to do this so if I do need to, how do I do it?  Can I
> just take the sprocket and carrier off while the bike is on it's
> sidestand or does all weight need to be off the rear wheel?  Thanks in
> advance!
> 
> *****
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