Here's a few more schematics and photos illustrating the chain adjusting procedure for the 860gt/900gt/Darmah type frame. Go down to page 110 to start.
The whole book is online and good reading with some great photos
Ciao, Nick Alaniz, 2002 Ducati ST4$, Sacramento, CaL.
----- Original Message -----
From: "Michael Heth" <mheth@motolectric.com>
To: "st2 owners" <st2_owners@yahoogroups.com>
Sent: Thursday, December 23, 2010 1:25:51 PM
Subject: Re: [DucatiST] Dr. T's Ducati Desmo sketches?
On Dec 23, 2010, at 6:12 AM, st ryder wrote:
>
> Thanks for that bit of Ducati knowledge re screw and lock-nut
> Ducatis. That ecentric swing arm-chain adjustment does indeed sound
> brilliant. What happened to the idea? Too expensieve?
That was used on a few bikes, it was on the B50MX I owned back then.
http://motorbike-search-engine.co.uk/classic_bikes/bsa_b50mx.jpg
the adjuster are easy to see in the photo.
I would think that having that part (the swingarm pivot) be adjustable
vs. just the small adjusters at the end of the swingarm might
introduce a sloppiness in the system (just guessing here).
One of the handling tweaks I did 20+ years ago was to drill and pin
the swingarm pivot. It eliminates/minimizes whatever microscopic wear
is created due to the forces at work at that critical point.
On my 850 Commando with the vernier isolastic adjusters I could easily
feel the difference between .006 and .010 (yes, 6 thou and 10 thou) of
clearance.
And my passenger could too, she asked why the bike felt different when
I opened it up to .010.
At 6 it was a nice tight handling bike and at 10 it was less so but
also had a bit less vibration coming into the frame.
I never would have thought .004 of clearance could be felt until I
tried it myself. Made me aware of the benefit of keeping the fork
bushings within spec.
Thanks,
M./
Michael Heth
mheth@motolectric.com
(415) 992-7840
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