Paso 20mm swingarm pivot modification

discussions specific to the 907IE
Speedmade
Posts: 50
Joined: Sun Jul 12, 2009 1:56 am
model: 906 Paso
year: 1989
Location: Minnesota, USA

Paso 20mm swingarm pivot modification

Post by Speedmade »

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.
Attachments
Paso-pivot-1_zpsdywrjf4b.jpg
Paso-pivot-1_zpsdywrjf4b.jpg (218.68 KiB) Viewed 11220 times
Paso-pivot-2_zpsicwih7xi.jpg
Paso-pivot-2_zpsicwih7xi.jpg (256.29 KiB) Viewed 11220 times
Speedmade
Posts: 50
Joined: Sun Jul 12, 2009 1:56 am
model: 906 Paso
year: 1989
Location: Minnesota, USA

Re: Paso 20mm swingarm pivot modification

Post by Speedmade »

I found a 20mm axle from some Japanese bike was very close in spec to the Paso pivot.
Attachments
Paso-15-20%20pivot_zpsutn3mf60.jpg
Paso-15-20%20pivot_zpsutn3mf60.jpg (298.55 KiB) Viewed 11220 times
Speedmade
Posts: 50
Joined: Sun Jul 12, 2009 1:56 am
model: 906 Paso
year: 1989
Location: Minnesota, USA

Re: Paso 20mm swingarm pivot modification

Post by Speedmade »

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.
Attachments
Paso-fixture-1_zpsyvc7fl80.jpg
Paso-fixture-1_zpsyvc7fl80.jpg (309.08 KiB) Viewed 11220 times
Paso-fixture-2_zpsqzqszulh.jpg
Paso-fixture-2_zpsqzqszulh.jpg (261.25 KiB) Viewed 11220 times
Speedmade
Posts: 50
Joined: Sun Jul 12, 2009 1:56 am
model: 906 Paso
year: 1989
Location: Minnesota, USA

Re: Paso 20mm swingarm pivot modification

Post by Speedmade »

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.
Attachments
Paso-pivot-3_zpsgufkslsm.jpg
Paso-pivot-3_zpsgufkslsm.jpg (263.23 KiB) Viewed 11220 times
Paso-pivot-4_zps1eykjsfg.jpg
Paso-pivot-4_zps1eykjsfg.jpg (238.4 KiB) Viewed 11220 times
Speedmade
Posts: 50
Joined: Sun Jul 12, 2009 1:56 am
model: 906 Paso
year: 1989
Location: Minnesota, USA

Re: Paso 20mm swingarm pivot modification

Post by Speedmade »

Modifications to the bearings in the swingarm were pretty straight forward. Sourced some new bearings and made a few new spacers.
Attachments
Paso-RH-swingarm-2_zpszcuwk47r.jpg
Paso-RH-swingarm-2_zpszcuwk47r.jpg (174.96 KiB) Viewed 11220 times
Paso-RH-swingarm-1_zpsdbjdtfdg.jpg
Paso-RH-swingarm-1_zpsdbjdtfdg.jpg (131.94 KiB) Viewed 11220 times
Paso-LH-swingarm-2_zpsxxy6b9kl.jpg
Paso-LH-swingarm-2_zpsxxy6b9kl.jpg (173.45 KiB) Viewed 11220 times
Paso-LH-swingarm-1_zpsdxiwvsbc.jpg
Paso-LH-swingarm-1_zpsdxiwvsbc.jpg (151.62 KiB) Viewed 11220 times
Speedmade
Posts: 50
Joined: Sun Jul 12, 2009 1:56 am
model: 906 Paso
year: 1989
Location: Minnesota, USA

Re: Paso 20mm swingarm pivot modification

Post by Speedmade »

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.
Attachments
Paso-20mm-3_zpshsnbowuc.jpg
Paso-20mm-3_zpshsnbowuc.jpg (259.5 KiB) Viewed 11220 times
Paso-20mm-4_zpsbzbcwbeb.jpg
Paso-20mm-4_zpsbzbcwbeb.jpg (277.7 KiB) Viewed 11220 times
Paso-20mm-1_zpsyfkqnbep.jpg
Paso-20mm-1_zpsyfkqnbep.jpg (189.63 KiB) Viewed 11220 times
Paso-20mm-2_zpsmjyfmecd.jpg
Paso-20mm-2_zpsmjyfmecd.jpg (215.97 KiB) Viewed 11220 times
Speedmade
Posts: 50
Joined: Sun Jul 12, 2009 1:56 am
model: 906 Paso
year: 1989
Location: Minnesota, USA

Re: Paso 20mm swingarm pivot modification

Post by Speedmade »

This should make for a much stiffer chassis.
Attachments
Paso-pivot-final_zpsugmhmvop.jpg
Paso-pivot-final_zpsugmhmvop.jpg (164.37 KiB) Viewed 11220 times
User avatar
englishstiv
paso grand pooh-bah
Posts: 1111
Joined: Wed Apr 09, 2008 9:57 pm
model: 907 I.E.
year: 1992
Location: Manchester, England.

Re: Paso 20mm swingarm pivot modification

Post by englishstiv »

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:
DUCATI 907ie 1992
HARLEY DAVIDSON ELECTRA GLIDE CLASSIC 1991
Mc tool
paso grand pooh-bah
Posts: 1874
Joined: Wed Dec 05, 2007 12:35 am
model: 906 Paso
year: 1990
Location: Newzealand

Re: Paso 20mm swingarm pivot modification

Post by Mc tool »

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 :) :)
I wish I was young again............Id be heaps smarter than last time
Speedmade
Posts: 50
Joined: Sun Jul 12, 2009 1:56 am
model: 906 Paso
year: 1989
Location: Minnesota, USA

Re: Paso 20mm swingarm pivot modification

Post by Speedmade »

The frame will be powder coated once I finish the rest of the modifications to install the 999S motor
Mc tool
paso grand pooh-bah
Posts: 1874
Joined: Wed Dec 05, 2007 12:35 am
model: 906 Paso
year: 1990
Location: Newzealand

Re: Paso 20mm swingarm pivot modification

Post by Mc tool »

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 ?
I wish I was young again............Id be heaps smarter than last time
User avatar
Frank.61
Posts: 264
Joined: Fri Jul 24, 2015 11:21 am
model: 750 Paso
year: 1989
Location: Belgium

Re: Paso 20mm swingarm pivot modification

Post by Frank.61 »

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
Bimota SB4-S - 1984
Ducati Paso 750 - 1989
Suzuki SV1000S - 2008
Ducati Monster 796 abs - 2010
User avatar
paso750
paso grand pooh-bah
Posts: 5558
Joined: Sun Jul 18, 2004 12:00 am
model: 750 Paso
year: 1987
Location: southern Germany

Re: Paso 20mm swingarm pivot modification

Post by paso750 »

how did you solve it with the bearings in the engine case?
I assume the 999 engine originally uses a 20mm swingarm pivot.
User avatar
Frank.61
Posts: 264
Joined: Fri Jul 24, 2015 11:21 am
model: 750 Paso
year: 1989
Location: Belgium

Re: Paso 20mm swingarm pivot modification

Post by Frank.61 »

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:
Bimota SB4-S - 1984
Ducati Paso 750 - 1989
Suzuki SV1000S - 2008
Ducati Monster 796 abs - 2010
User avatar
paso750
paso grand pooh-bah
Posts: 5558
Joined: Sun Jul 18, 2004 12:00 am
model: 750 Paso
year: 1987
Location: southern Germany

Re: Paso 20mm swingarm pivot modification

Post by paso750 »

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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