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So I was looking at the carburetor for the 69 DT1 I’m working on. It appears that the mounting flange is bent. It didn’t want to come off the studs easily. Is there a way to straighten the flange? Or is it a loss? Looks pretty bent on one side.
I just file them flat & carry on as might be safer than trying to straighten it. Only thing to be careful of [& might be what caused it in the first place 'is'] don't fit an Oring that's too fat as it'll warp it for sure. Plus if you've filed a lot off to get it flat then an original Oring might still be too fat!!. Other thing is the soft crap alloy of those carbs can pinch around the studs where the nuts pull up. My thought anyway.
Just another thought if ya really really want to straighten it i'd probably set it between two solid flat plates in a big vice & heat it as much as you dare & tighten it up a bit till flat. Ok, you try it first lol.
I looked at the parts diagram for the carb on the bike and it shows no o ring being used, but there is a notch for it. Just shows a gasket on each side of the spacer. Is that correct? Or did they use o rings?
Good question, & i don't know the answer or even know what i've got on mine except i'm running a 360 32mm carb but not had it off the bike for many years. Bottom line, gasket would be fine on its own but then again so would an Oring, just don't overdo the thickness. That wasn't a helpful answer was it!!, sorry.
Originally they didn't install the O rings in the groove .
DT2 / RT2 parts books are the first to show them .
I remember someone posting earlier , that they were often fitted
to the earlier models to try and seal intake tract , when carb flange had warped .
Hope that helps some .
If you wind up grinding the flange to straighten it ,
you could still run into problems if you try a fit an O ring .
If the depth of the groove is uneven due to metal being removed from
the surface , it could wind up with the O ring being unable to compress sufficiently .
I have had this problem before on Flange Mount carbs on a T 350 .
I tried an oversize o ring , and I think the body twisted slightly jamming the slide .
Over tightening the flange mount bolts / nuts could do that too .
Had same issue with a DT1 and DT1MX carbs, filed them flat. Also check the fiber blocks for flatness. Mine were not flat. Gaskets or o-rings both will seal if the surface on the carb and the fiber block are flat. Just don't over tighten.