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2010 Ducati monster 1100s
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Discussion Starter · #1 ·
Ducati lovers,
I’m having a little issue of 3/4 of an inch gap at the tail between the seat & frame.
It’s troubling me since I think that I tried everything, I played with the latch forward, backwards & also tried adding spacers but no luck. The tail rubber pads are not making contact with the frame. It’s a Corbin model D-M11-9 that should fit properly, I tried contacting Corbin but since I bought it second hand, I don’t get respect. So that only way that the rear tail is flush is when the front pins of the seat are sitting on top of the tank pin slaught but that can’t work bc if I sit on it the pin will break. Maybe I’m just too picky but since I’ve been working on her all went perfectly except the seat. Please any advice would be appreciated!!!
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2010 Ducati monster 1100s
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14 Posts
Discussion Starter · #3 ·
@ericfreeman I haven’t thought of that but Yes I have a tail tidy mod & it’s hard to say that the tail tidy mod will effect the fitment of the Corbin but again I can be wrong. If that’s the case, I can’t see how any mod between the seat or frame can get rid of that 3/4 inch gap at the tail maybe it’s there to stay.
 

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2009 Ducati Monster 1100 S
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68 Posts
Hmmmm, I put a Sargent seat on and did not encounter any issues as you bring forth. Bike is second hand to me and had a fender eliminator or whatever they call it ....

But, I can offer some insight to your dilemma if you wish. I work as a measurement engineer ... so I could collect data from my OEM Ducati seat pan, then get same data from my Sargent seat pan, and if possible give you some meaningful guidance on how to ascertain if your Corbin seat pan was made correctly. Failing the latter, you could send me your seat pan and I could do a forensic measurement investigation. Winter is here soon... so ... if you had credible data to defend a stance that Corbin sold inferior product then a solution might be offered by them. Let me know.
 

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2010 Ducati monster 1100s
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Discussion Starter · #6 ·
P.S. Are you a REAL motorcyclist? I wonder ... as I did not see a skateboard hanging on your man cave wall?
Hi, yes my skateboard is still hanging, lol,
Thank you for your reply 🙏🏻 Maybe with a measurement engineer we can figure this out.
This Corbin seat is made for my year bike and nothing is blocking but somehow it doesn’t sit flush. The Corbin seat as you can see in the pictures has 8 round rubber pads and the 2 pins on the front of the seat that fits into the tank spacer. When I don’t insert the seat 2 pins into the tank spacers but on top of the tank spacers the Corbin seat sits flush and with no gap. I’ve read that people cut off some of the 8 round rubber pads to make it fit but I’m not sure if that’s my issue??
 

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2009 Ducati Monster 1100 S
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68 Posts
LOL, you are describing a misfit visible by a rotation around some pivot point.
So, it would appear that the two engagement pins are not in correct place.
What we should do is ...
1. I will measure my M1100S seat pan with metrology equipment and then translate the critical points into a measurement that you can do without sending you seat to me.

If, you had access to a laser scanner or any measurement device, we could really nail down the issue. This would be fun!

Plastic is not STEEL!

let me know
 

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Discussion Starter · #8 ·
LOL, you are describing a misfit visible by a rotation around some pivot point.
So, it would appear that the two engagement pins are not in correct place.
What we should do is ...
1. I will measure my M1100S seat pan with metrology equipment and then translate the critical points into a measurement that you can do without sending you seat to me.

If, you had access to a laser scanner or any measurement device, we could really nail down the issue. This would be fun!

Plastic is not STEEL!

let me know
Hi, the only measurement tool I got is a measurement tape, lol , so if I’m understanding correctly maybe my seat pan is off, also please clarify when you say “seat pan” meaning the backside of the seat or where the seat connects on the Duc?? Your right it seems like 2 engagement pin are too low since when they sit on top of the tank slauht it fits perfectly, maybe trimming some of the seat round rubber pads can fix that because I wouldn’t know how or if it’s possible to reposition the 2 engagement pins??Thank you 🙏🏻🙏🏻
 

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my OEM seat pan is in the car and will be measured tomorrow. After that I will reduce the data to terms you can comprehend with a ruler and a few basic tools like scissors, paper, and a plastic protractor.
I have the OEM seat and a Sargent set so I can measure both seat pans ( yes the plastic base is the seat pan.)
 

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Discussion Starter · #10 ·
my OEM seat pan is in the car and will be measured tomorrow. After that I will reduce the data to terms you can comprehend with a ruler and a few basic tools like scissors, paper, and a plastic protractor.
I have the OEM seat and a Sargent set so I can measure both seat pans ( yes the plastic base is the seat pan.)
Ok thank you 🙏🏻 🙏🏻🙏🏻
 

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I have got to say that the Corbin seat base looks awful. Both of my seat bases look professional, but I do not like the Sargent seat and I must give them drawings to sculpt the foam to my requirements.

Okay, tomorrow we measure, then I will analyze and report back, so hang on for a few days so that I get this expressed in a clear manner.
 

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Measurement Update 1:
I have a stock seat measured. Interesting observations.
Remove your seat. Stand behind the taillight and line your vision down along the black subframes and see the difference between the left and right sides. The right side dips lower. The frame is not symmetrical. So, stock seat has accounted for this height difference at support points. If the corbin seat is supported symmetrically at the two cushions directly under the riders seat then that could be an issue.

I also take issue with corbin putting the cushions under the rider to be supported by your fuel cell. HELLO CORBIN! From you photo the corbin does not appear to account for the asymmetrical frame lines.

Analysis will continue but in the meantime if would be worth considering the following:
a. Is the seat distorting when you sit on it. Engage a witness and video the any seat movement when occupied. Set it up on a car jack or blocks.
b. Is the seat skin too tight and pulling the tail up when you sit on it
c. To measure any place where there should be contact with a support cushion you can use a soft candy like a wrapped salt water taffy....size the candy appropriately, wrap it back up and place them at all of the points you want to investigate. Then you can have physical evidence of the gaps.
 

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Since we have the same bike I want to ask you when you last greased the swingarm pivot? I cringed at the Ducati manual service instructions so I developed a way to replace the pivot with a modified pivot complete with grease and grease holes ... I engineered the whole system. It took me 30 minutes to swap the pivot and grease the bearings. I have written a paper on the project just for laughs. Let me know if you are interested.
 

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Discussion Starter · #16 ·
Since we have the same bike I want to ask you when you last greased the swingarm pivot? I cringed at the Ducati manual service instructions so I developed a way to replace the pivot with a modified pivot complete with grease and grease holes ... I engineered the whole system. It took me 30 minutes to swap the pivot and grease the bearings. I have written a paper on the project just for laughs. Let me know if you are interested.
Dr Ducstein, Thank you 🙏🏻 for all the interesting calculations & info. I will look into all that you have recommended & stated as soon as I can since the frame isn’t symmetrical and the Corbin seat is with the rubber pads being all the same. And will use your suggestion with the candy. Regarding the swingarm pivot please if you can give me more info since I’m not sure. Also I went for a short ride and I find myself always sliding towards the tank, I’m not sure if it’s the seat positioning?? I have stock handlebar but I removed the I believe the 2 inch riser & with stock footrest ( I’m thinking of getting aftermarket ones to get a more sporty feel maybe that would help ) I’m thankful for help & your investigation!!!
 

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It drives me nuts crazy .... being forced forward all the time .... I have plans to build a foam model for the seat pros to copy ... when I wear full leathers the issue is not so annoying but with jeans the sliding forward aggravates the lower spine.
I installed 1" taller Rizoma bars and opted for a Sargent seat with lowered profile ... but still need to get the bars up a bit for long riding comfort.
Let me know how it goes and you are most welcome. I learned a lot too from this.
 
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