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Interesting Carb on my XR400

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Can anyone ID this? It looks like some kind of flat slide, I have no idea what size or what its off of. This bike was set up pretty seriously by the PO, it was raced at a number of major venues around the country and I have no doubt that it was set up right based on the receipts I got with the purchase. However, it was passed through a few family hands before I got it, and now its got a lot of rust and appearance issues. Someone, somewhere put this carb on it, and I havent run it much since I've gotten it. I know its a bear to start, but it runs well enough once its on. My experience is mostly two strokes and street bikes, so any help here is appreciated.

on to the pics...

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Its a single cable, the cable goes straight to the slide, and into the top of the carb.

Thoughts?

EDIT: Well it looks like a Mikuni TM series flat slide. The question now is, should I be looking to replace this?

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Looks like a Mikuni TMX. Is there no other markings on the carb?

I think it would be wise to replace it with a carb that uses a push/pull throttle cable setup.

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In all the research Ive done, I've never seen anyone talk about a TM series carb on an XR. Strange...

Maybe it was common a few years ago? XR's only sells these for the 250, the 350, and the 600, so my guess is that its a 36mm maybe that USED to be offered for the 400, or its a 600 carb that someone fit to the bike. In any case, I guess it tunes like any other flatslide.

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Looks like a basic 38mm TM carb for the XR. These were common in Australia and used by Honda Australia on their racing XR400. If the bike runs fine, keep it.

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