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12120291A & B What's the Difference?

Started by MonsterMadMarty, July 12, 2014, 06:33:53 PM

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MonsterMadMarty

July 12, 2014, 06:33:53 PM
What's the difference between piston rings 12120291A and 12120291B?

And which, if any will fit the early carburettor 900's (93' to 97') pistons?

Cheers  [thumbsup]
RIDING - 1993 M900 x 2; 2007 M400; 2007 Factory 900XR

Recently purchased: Fire damaged 2001 S4!

My greatest fear in life is that when I die my better half will sell my Ducati's and tools for the price I told her I paid for them!

ducpainter

#1
July 13, 2014, 03:49:35 AM
According to the online lookup at Ducati Omaha those numbers have been replaced by 12110401A...

but they say it's a piston pin.
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MonsterMadMarty

#2
July 13, 2014, 04:58:47 AM

RIDING - 1993 M900 x 2; 2007 M400; 2007 Factory 900XR

Recently purchased: Fire damaged 2001 S4!

My greatest fear in life is that when I die my better half will sell my Ducati's and tools for the price I told her I paid for them!

ducpainter

#3
July 13, 2014, 05:35:27 AM
Dunno what to tell you

A guess at the difference in the part#'s...

Ducati has A and B cylinders and pistons based on tolerances.

I think, but don't know, that the suffix of the number is to match with those pistons and cylinders.
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


MonsterMadMarty

#4
July 13, 2014, 05:45:38 AM
I was guessing from the Ducati logo B may just be a predecessor to A !!!

Did the actually pistons change when the 900 went from carburettors to injectors?
RIDING - 1993 M900 x 2; 2007 M400; 2007 Factory 900XR

Recently purchased: Fire damaged 2001 S4!

My greatest fear in life is that when I die my better half will sell my Ducati's and tools for the price I told her I paid for them!

ducpainter

#5
July 13, 2014, 05:47:59 AM
Quote from: MonsterMadMarty on July 13, 2014, 05:45:38 AM
I was guessing from the Ducati logo B may just be a predecessor to A !!!

Did the actually pistons change when the 900 went from carburettors to injectors?
Could be.

I don't know.
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


brad black

#6
July 13, 2014, 06:50:41 AM
a last # or letter change is a part progression/supercesion.  they should be identical functionally i'd think, but check all rings are the same size and form.  i'm pretty sure all 900 top rings are dykes rings.  maybe different style oil ring?  dunno.
Brad The Bike Boy

http://www.bikeboy.org
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