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Paso 20mm swingarm pivot modification

Posted: Mon Dec 19, 2016 11:20 pm
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.

Re: Paso 20mm swingarm pivot modification

Posted: Mon Dec 19, 2016 11:22 pm
by Speedmade
I found a 20mm axle from some Japanese bike was very close in spec to the Paso pivot.

Re: Paso 20mm swingarm pivot modification

Posted: Mon Dec 19, 2016 11:23 pm
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.

Re: Paso 20mm swingarm pivot modification

Posted: Mon Dec 19, 2016 11:25 pm
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.

Re: Paso 20mm swingarm pivot modification

Posted: Mon Dec 19, 2016 11:28 pm
by Speedmade
Modifications to the bearings in the swingarm were pretty straight forward. Sourced some new bearings and made a few new spacers.

Re: Paso 20mm swingarm pivot modification

Posted: Mon Dec 19, 2016 11:31 pm
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.

Re: Paso 20mm swingarm pivot modification

Posted: Mon Dec 19, 2016 11:32 pm
by Speedmade
This should make for a much stiffer chassis.

Re: Paso 20mm swingarm pivot modification

Posted: Mon Dec 19, 2016 11:34 pm
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:

Re: Paso 20mm swingarm pivot modification

Posted: Tue Dec 20, 2016 3:28 am
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 :) :)

Re: Paso 20mm swingarm pivot modification

Posted: Tue Dec 20, 2016 4:52 am
by Speedmade
The frame will be powder coated once I finish the rest of the modifications to install the 999S motor

Re: Paso 20mm swingarm pivot modification

Posted: Tue Dec 20, 2016 5:22 am
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 ?

Re: Paso 20mm swingarm pivot modification

Posted: Tue Dec 20, 2016 11:13 am
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

Re: Paso 20mm swingarm pivot modification

Posted: Tue Dec 20, 2016 11:57 am
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.

Re: Paso 20mm swingarm pivot modification

Posted: Tue Dec 20, 2016 12:10 pm
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:

Re: Paso 20mm swingarm pivot modification

Posted: Tue Dec 20, 2016 12:29 pm
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...)