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 Post subject: Paso 20mm swingarm pivot modification
PostPosted: Mon Dec 19, 2016 11:20 pm 
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Joined: Sun Jul 12, 2009 1:56 am
Posts: 48
Location: Minnesota, USA
model: 906 Paso
year: 1989
I found that the Paso has a 15mm swingarm pivot. That is very small especially considering that all other Ducati models since 1990 they have used a 20mm pivot. So I decided that I wanted to upgrade.
This would require modifications to the frame and the bearings in the swingarm.

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 Post subject: Re: Paso 20mm swingarm pivot modification
PostPosted: Mon Dec 19, 2016 11:22 pm 
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Joined: Sun Jul 12, 2009 1:56 am
Posts: 48
Location: Minnesota, USA
model: 906 Paso
year: 1989
I found a 20mm axle from some Japanese bike was very close in spec to the Paso pivot.

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 Post subject: Re: Paso 20mm swingarm pivot modification
PostPosted: Mon Dec 19, 2016 11:23 pm 
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Joined: Sun Jul 12, 2009 1:56 am
Posts: 48
Location: Minnesota, USA
model: 906 Paso
year: 1989
My plan was to bore out the frame but it was impossible to fit in a milling machine. So I made fixtures that allowed me to drill out the holes in steps.

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 Post subject: Re: Paso 20mm swingarm pivot modification
PostPosted: Mon Dec 19, 2016 11:25 pm 
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Joined: Sun Jul 12, 2009 1:56 am
Posts: 48
Location: Minnesota, USA
model: 906 Paso
year: 1989
Measuring the inside of the frame I realized that there would be very little surface area left so I had cups machined that I welded over the original pivot area.

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 Post subject: Re: Paso 20mm swingarm pivot modification
PostPosted: Mon Dec 19, 2016 11:28 pm 
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Joined: Sun Jul 12, 2009 1:56 am
Posts: 48
Location: Minnesota, USA
model: 906 Paso
year: 1989
Modifications to the bearings in the swingarm were pretty straight forward. Sourced some new bearings and made a few new spacers.

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 Post subject: Re: Paso 20mm swingarm pivot modification
PostPosted: Mon Dec 19, 2016 11:31 pm 
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Joined: Sun Jul 12, 2009 1:56 am
Posts: 48
Location: Minnesota, USA
model: 906 Paso
year: 1989
I had to turn the head of the new pivot down slightly to fit down the frame pocket.
On the other side I had to source a small OD flange nut.
Everything fit so I could install the black plastic caps.

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 Post subject: Re: Paso 20mm swingarm pivot modification
PostPosted: Mon Dec 19, 2016 11:32 pm 
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Joined: Sun Jul 12, 2009 1:56 am
Posts: 48
Location: Minnesota, USA
model: 906 Paso
year: 1989
This should make for a much stiffer chassis.

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 Post subject: Re: Paso 20mm swingarm pivot modification
PostPosted: Mon Dec 19, 2016 11:34 pm 
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paso grand pooh-bah
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Joined: Wed Apr 09, 2008 9:57 pm
Posts: 1020
Location: Manchester, England.
model: 907 I.E.
year: 1992
I absolutely love shit like this, Well done and brilliant photo's and explanation I think G will be putting this in the FAQ thread pretty soon :thumbup: :thumbup: :beer:

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 Post subject: Re: Paso 20mm swingarm pivot modification
PostPosted: Tue Dec 20, 2016 3:28 am 
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paso grand pooh-bah
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Joined: Wed Dec 05, 2007 12:35 am
Posts: 1484
Location: Newzealand
model: 906 Paso
year: 1990
I love shit like this too , more the psychiatric side of things than anything to do with motorcycle engineering . I mean your obviously no dummie when it comes to making things outa metal but if you really wanted to stiffen up the chasis you shoulda just painted it , any how , nice job ...... if you must :) :)

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 Post subject: Re: Paso 20mm swingarm pivot modification
PostPosted: Tue Dec 20, 2016 4:52 am 
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Joined: Sun Jul 12, 2009 1:56 am
Posts: 48
Location: Minnesota, USA
model: 906 Paso
year: 1989
The frame will be powder coated once I finish the rest of the modifications to install the 999S motor


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 Post subject: Re: Paso 20mm swingarm pivot modification
PostPosted: Tue Dec 20, 2016 5:22 am 
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paso grand pooh-bah
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Joined: Wed Dec 05, 2007 12:35 am
Posts: 1484
Location: Newzealand
model: 906 Paso
year: 1990
Oh yeah ! I can so see why you'd want to do that. :idea: Have you thought about fitting the Paso body work to a 999s ?

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 Post subject: Re: Paso 20mm swingarm pivot modification
PostPosted: Tue Dec 20, 2016 11:13 am 
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Joined: Fri Jul 24, 2015 11:21 am
Posts: 123
Location: Belgium
model: 750 Paso
year: 1989
Hi, soory but maybe I've missed it: how did you solve it with the bearings in the engine case?
Also, what is your main reason to go from 15 to 20mm?

Frank

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Bimota SB4-S - 1984
Ducati Paso 750 - 1989
Suzuki SV1000S - 2008
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 Post subject: Re: Paso 20mm swingarm pivot modification
PostPosted: Tue Dec 20, 2016 11:57 am 
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paso grand pooh-bah
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Joined: Sun Jul 18, 2004 12:00 am
Posts: 4978
Location: southern Germany
model: 750 Paso
year: 1987
Quote:
how did you solve it with the bearings in the engine case?

I assume the 999 engine originally uses a 20mm swingarm pivot.


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 Post subject: Re: Paso 20mm swingarm pivot modification
PostPosted: Tue Dec 20, 2016 12:10 pm 
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Joined: Fri Jul 24, 2015 11:21 am
Posts: 123
Location: Belgium
model: 750 Paso
year: 1989
Ok, missed that (the 999 engine).
Wow, quit a project!
Assume that adapting the swingarm bolt is the easiest modification :thumbup:

Will be interesting to see the project in progress!

Good luck :beer:

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Bimota SB4-S - 1984
Ducati Paso 750 - 1989
Suzuki SV1000S - 2008
Ducati Monster 796 abs - 2010


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 Post subject: Re: Paso 20mm swingarm pivot modification
PostPosted: Tue Dec 20, 2016 12:29 pm 
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paso grand pooh-bah
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Joined: Sun Jul 18, 2004 12:00 am
Posts: 4978
Location: southern Germany
model: 750 Paso
year: 1987
Speedmade, don`t mind me asking but seeing that the thread of the 20mm pivot is longer I wonder which part of it sits in the frame. Hope you get what I mean. (if it`s the threaded part it could cause radial play, which may be gone if all is tightened up, but still...)


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