Didn't know there were different models, they are stock '89 MC18 carbs, big ass flatslides.

Any way I can ID them? is there a SN?

Threads on the tubes and in the carb bodies are OK but the left one is leaking, keeps filling the crank case up with gas. Hope it was a piece of dirt cause float and needle both look perfect.

Any ideas what's the baseline jetting for the stock pipes at sea level?