Alright, this one is on me. I decided to get some cheap carbs from Yahoo Auctions and saw a set listed as MC18 carbs, but they had no electronic controls, so I thought that someone listed MC16 carbs as MC18 by mistake.

Spent about 8k yen... and they are TA06 carbs from an NS250R.

They need a rebuild, so do I pawn them off to upgarage, or are they usable on the MC16?

To be honest, I've never held a set of MC11 carbs, so I don't know how different they are. I'd love to have a tinker, but I imagine it would be easier to just use TA10s.

Have you had the float bowls off the bottom of the NS carbs yet, and removed all the jets? Also, you need to compare the needles and emulsion tubes. Remember the NS is a short-stroke piston ported motor, and its fuelling requirements will differ significantly to that of the "square" MC16.
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Andy.
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Haven't inspected any of the jets and other things since everything is covered and clogged in a greenish-brown layer of what I assume is old 2-stroke oil. Haven't seen any open oil inlets, and there's no ethanol mixed in gas here, so I assume the guy used to run premix and the gas evaporated while the bike was parked, leaving everything coated in oil, better than corrosion I guess.

From my tinkering since making the post, the first issue is that the carbs are "reversed" since they are mounted at and intake from the front of the engine on the MC11. So on the MC16 the cable bracket ends up facing towards the back of the bike. Adding oil feed from the MC16 oil pump should be easy enough with some M5 barbs, since there are threaded holes on the intake side of the carbs and the oil pump cable is pretty long, but the throttle needs some creative routing.

So I'll probably get another set of carbs, but I might be able to use these for starting the bike for the first time since I got it

Pulled the main jets that I had soaking in gasoline, Both of them are #132, so maybe these were actually used on an MC18

I highly doubt it, to be honest. The MC18 was already using PGM controlled air correction by 1988, albeit quite basic, and the carbs (galleries) will be very different internally. I don't think the TA06 even uses power jets.
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Andy.
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Does that stuff need to be connected for an MC18 to run? My theory is that some guy rigged these up to run on his MC18, and the bike got bought by the breakers, hence the big jets and being listed as MC18 carbs since those guys usually just go by the bike that was taken apart.

The 88-90 HRC F3 kit doesn't use the air correction, but does use different [HRC specific] carbs and ignition. I suspect one could be made to run without it all, but the reality is that stuff is (was) easy to get in Japan. It's not like someone in outer Mongolia trying to get a bitsa NSR running with little to no hope of getting hold of a correct set of carbs easily or on the cheap. I just don't see it... I think they were simply mis-advertised by someone who didn't know their arse from their elbow! 😉🤣🤣
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Andy.
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