Help identify a small KEIHIN carburetor?

I bought a small Honda dirt bike with this carburetor on it. Turns out it is missing the needle. The bike itself is made from various parts (mostly Honda). There's a "custom" adapter be twine this carburetor and the engine leading me to believe it is not original to this bike.
What did it come off of? When was it made?Help identify a small KEIHIN carburetor Added (1). The only markings i can find are "CA95D" and "H1" or "HI". Front opening is a bought 28mm.

Keihincarbs.com/home.html - that's their website

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