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Rear sprocket mounting dimensions?
http://forums.ducatipaso.org/viewtopic.php?f=2&t=8201
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Author:  Jorian [ Sat Nov 02, 2019 9:23 am ]
Post subject:  Rear sprocket mounting dimensions?

Can someone kindly confirm the inside diameter size of the rear sprocket?
It's a 1989 model 906.

Also, the owner's manual says it has 41 teeth, but the parts book says 40.
Is there a well accepted preference?

Thanks,
Jorian

Author:  Derek [ Sat Nov 02, 2019 11:15 am ]
Post subject:  Re: Rear sprocket mounting dimensions?

90mm according to JT sprockets : http://www.jtsprockets.com/catalogue/model/3989/

Image

Author:  Mc tool [ Sat Nov 02, 2019 5:55 pm ]
Post subject:  Re: Rear sprocket mounting dimensions?

These bikes are fairly tall geared and mine , at 100kph in 6th gear is stumbling along at to low revs,sometimes I used 5th gear. So maybe try the 41

Author:  Jorian [ Sat Nov 02, 2019 10:44 pm ]
Post subject:  Re: Rear sprocket mounting dimensions?

The one here has ID = 92mm, but it is evidently changed to suit an adaptor for use with a wide tyre which is no longer to be used.
The sprocket carrier is also modified unfortunately, down to 88mm.
Does anyone have a spare carrier they want to sell?
Otherwise I'll have to restore this one, which I'd rather not.

Good also to have info on the ratios, so Thanks Folks.

Author:  Mc tool [ Sat Nov 02, 2019 11:57 pm ]
Post subject:  Re: Rear sprocket mounting dimensions?

You could get a ring turned up , to fit between sprocket and carrier .....if you did it right you could use a larger/modified washers under the sprocket nuts to hold it in place

Author:  Jorian [ Wed Nov 06, 2019 9:41 pm ]
Post subject:  Re: Rear sprocket mounting dimensions?

I found what I hope is the correct sprocket carrier, and bought it via ebay.
It was not described as being fit for a Paso, but looks identical to the one here (modified).

Author:  Jorian [ Thu Dec 12, 2019 6:00 am ]
Post subject:  Re: Rear sprocket mounting dimensions?

The received sprocket carrier is an assembly - light metal casting plus steel sleeve, spacers, bearings etc.
The casting looks to be identical, and it's the internal parts that differ. Need to swap them for the Paso bits.
I looked at some drawings of the bevel 900SS assembly, looks like I need to do some press work.
Anyone done this, have any tips or warnings?

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