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DB2 /3/4 front sprocket.

 
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vort28



Joined: 22 Mar 2010
Posts: 2194
Location: Northwest , UK

PostPosted: Wed Jul 14, 2010 12:29 pm    Post subject: DB2 /3/4 front sprocket. Reply with quote

Am in the process of changing chain and sprockets on my DB4. Have found out that the front is 95% 900ss , with and extra recess to allow the sprocket to move outboard on the output shaft. B&C express can not find anything to suite . Anyone had similar issues and know of a source. I believe DB2 and 3 are the same.
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oily



Joined: 05 Apr 2008
Posts: 4788
Location: worcestershire

PostPosted: Wed Jul 14, 2010 12:54 pm    Post subject: Reply with quote

Not quite sure what you mean about this "recess" but as an option, there's always the machining or adding a spacer options available Wink
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vort28



Joined: 22 Mar 2010
Posts: 2194
Location: Northwest , UK

PostPosted: Wed Jul 14, 2010 1:23 pm    Post subject: Reply with quote

Ducati sprocket is flat on the front , and locking ring bolts to it. DB4 has a recess for the locking ring 3.5/4mm deep , so it moves the front sprocket outwards to align to rear. Problem with machining is they are hardened , so spark eroding only. Not the cheapest.
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oily



Joined: 05 Apr 2008
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Location: worcestershire

PostPosted: Wed Jul 14, 2010 10:42 pm    Post subject: Reply with quote

They would only be case hardened so once that's been ground away..................... Wink
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oily



Joined: 05 Apr 2008
Posts: 4788
Location: worcestershire

PostPosted: Thu Jul 15, 2010 8:38 am    Post subject: Reply with quote

Just been reading a forum where it's common practice to machine front sprokets and even weld two together to make off set sproket's so, as I thought, they arn't that hard Wink
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deebee4



Joined: 08 Jan 2011
Posts: 266
Location: Netherlands

PostPosted: Sat Jan 08, 2011 7:15 pm    Post subject: Reply with quote

Hi, I remember getting a sprocket from the Ducati dealer after I showed them the db4 item and they came up with one that fitted quite well. Maybe one from a 9xx would work?
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redtop



Joined: 04 Mar 2011
Posts: 13
Location: Stockholm, Sweden

PostPosted: Fri Mar 04, 2011 1:17 pm    Post subject: Reply with quote

The German company Wieres has the correct front sprockets for the DBs:
www.wieres.de
I bought a complete kit from them last year.

You can also machine a Ducati front sprocket to fit. Just bring the old sprocketet to a descent shop, or contact me and I'll be happy to send you a drawing.
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Desmo_Demon



Joined: 19 Sep 2011
Posts: 240
Location: Easley, SC, USA

PostPosted: Wed Dec 14, 2011 6:46 pm    Post subject: Reply with quote

I know this is an older thread, but I'll reply for any future searches on the subject....

redtop wrote:
The German company Wieres has the correct front sprockets for the DBs:
www.wieres.de
I bought a complete kit from them last year.

You can also machine a Ducati front sprocket to fit. Just bring the old sprocketet to a descent shop, or contact me and I'll be happy to send you a drawing.

Redtop provided a schematic/drawing of the dimensions for the front sprocket and I had two machined to fit the OEM retainer. This is a picture of the machine work and the retainer that was on my '94 DB2...



You may need to correct me, but I have been told and seen in the parts manuals that the DB3/4 has a front sprocket that is similar to the one used on the Paso 750 and a few other earlier Ducati bikes. That sprocket looks like this....



This is the only picture I have of the one that was on my Paso 750, but I think you can see how it is recessed on the one side. This sprocket allows the use of a regular Ducati retainer. I'm thinking this is the route I may wind up going, some day, if I cannot find another OEM Bimota retainer.

On the other hand, rear sprockets are an off-the-shelf item. I know they are readily available from Vortex and Supersprox. I recently bought a Supersprox.


Edit - This is a picture of a stock Paso 750 sprocket that I pulled from the Ducati Paso forum...


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vort28



Joined: 22 Mar 2010
Posts: 2194
Location: Northwest , UK

PostPosted: Thu Dec 15, 2011 2:37 pm    Post subject: Reply with quote

When I bought mine B&C express said they could not find a match, but maybe they just looked at the later stuff.
I had 2 spark eroded, but I guess in the future the paso knowlwdge will come in handy.
Thanks.
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