250 identification.

[blackdog97]

Hi all,

Could someone please help in identifying this particular model? I’ve been in touch with Ducati UK who think it’s either a Mach 1 or a Diana around '65 to '67 - apparently the engine isn't correct but this isn't confirmed either.

Frame #DM250*00301*2GM

Engine # DM250 81293

Many thanks,

Simon.

071.JPG

[DewCatTea-Bob]

" Could someone please help in identifying this particular model?
Frame #DM250*00301*2GM "

____ Well how about a picture ? _ As being able to see the Duke you have would help a lot towards becoming sure of it's particular model !
Also, what country was it produced for ?


" Engine # DM250 81293 "

____ That eng.# certainly makes it a 4-speed model, which were replaced by 5-speeders by Ducati (of Italy) in 1963.
Yours may be old enough to be of the very first year for the 250-motor models, but might possibly be as new as an early 1962-model motor (but that's rather doubtful).
__ Please confirm that your motor's alternator-cable (black-hosing, found near the right of the kick-lever), has a pair of yellow-wires within, (or whatever other colors).


Duke-Cheers,
-Bob

[blackdog97]

Hi Bob,

I've posted a side view above although I suspect it looked nothing like that originally. Wires to the LH casing are Brown and Black. I've have no idea which country it was originally intended for sorry.

Cheers,

Simon.

080.JPG

[double diamond]

The frame number and specification is consistent with a Mach 1 although the front fork and wheel apear to be from a 200. If the engine number is stamped on the left center case that would make it an early 4 speed Diana/Daytona or Monza depending upon the market. Matt

[blackdog97]

Thanks for that Matt.

Here is an image of the engine stampings if that helps?

Engine.jpg

Cheers,

Simon.

[double diamond]

Simon,

I'd identify this as a late 1961 or early 1962 4 speed. These had a ball bearing supporing the countershaft 1st gear. The later 4 speed has a roller bearing in this location, otherwise pretty much the same. There was really no distinction in specification between these early engines Monza vs. Diana. If it were a Diana MkIII it would be in a higher state of tune. But these distinctions have likely been obliterated since this appears to be a race bike. N/C singles never had Amal carbs installed at the factory (as this example has) and the original cam and piston have likely been replaced with race spec parts. Matt

[DewCatTea-Bob]

By: blackdog97...
" Wires to the LH casing are Brown and Black. "

____ Well, "Brown" has never been a stock-color for any wire-lead connected to a OHC.Ducati-alternator. _ Are you sure it's not a (dirty) red-wire ?
__ I'm curious about the rest of your Duke's (likely non-stock) electrical-system,
do you know much about it ? _ If not, got anymore pix showing any of it's other electrical-parts ?


" I've have no idea which country it was originally intended for sorry. "

____ So then what country is it currently in NOW ?
In any case, it's been altered too much to be sure of whichever particular model it originally was.
The motor is the best thing left to go by, and I can only most suspect that it was either a '250 Monza' or a 'Diana 250' -(not to be confused with a 'Diana Mark III').
More examination would be required to absolutely rule-out it having been a Motocross-model. _ Can you measure the bore-size of it's intake-port (directly in front of the carb that's mounted on it's cyl.head) ?


Duke-Cheers,
-Bob

[lloydy1]

Hi Simon,

If you follow this link you will fined your bike listed.

http://www.google.co.uk/url?sa=t&rct=j& ... ng&cad=rja

Cheers, Dave