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I'm trying to source the correct inlet duct (intake manifold) to attach a Dell'Orto SSI29D to a 250 narrow case (Mach 1). The bolt spacing seems to be about 52mm, the ID at the engine side about 29mm, and the OD for the carburetor about 35mm.

Would the OEM item have been aluminum or steel? I have seen both.

Is there an angle to it or is it straight?

Is this item common to other 250 bikes?

Any chance someone could take a close up photo of theirs so I know what I'm looking for?

Thanks!

-Jim

" I'm trying to source the correct inlet duct (intake manifold) to attach a Dell'Orto SSI29D to a 250 narrow case (Mach 1).
Would the OEM item have been aluminum or steel? I have seen both. "

____ I've also seen both types (for fitment of a SSI-carb), however I'm sure that no alloy-type was ever factory-fitted on ANY common production-line Duke-model (stock with a SSI).


" Is there an angle to it or is it straight? "

____ I think I've seen such similar steel-type 29mm-manifolds with a very-slight downward-bend (in the tubing), but I'm thinking that was only on some of the early wide-case models. _ I'm sure the Mach-I had a straight steel manifold-duct, (just the same as the Mark-3 model's).
Also, I think it's straight-tubing was welded to the adapter-flange at a slight downward angle.


" Is this item common to other 250 bikes? "

____ If you mean other 250 Duke-models,, other than the 250 Mark-3, the answer is no. _ However early 350 wide-case models use pretty-much the same manifold.


" Any chance someone could take a close up photo of theirs so I know what I'm looking for? "

____ I believe I have such a (spare / NOS) 29mm manifold, however I'm not sure which Duke-model it was for.
It's not currently within my reach, so I can't post a pic of it.


Dukaddy-Dukes,
-Bob

There were some drawings here: http://www.docc.ca/singles/html/intake.html
but seems to be dead links now.
I have some low res copies of the drawings, if wanted.

Jordan