Originally Posted by gearhead13
I am trying to find out what type of Novarossi i have:
It really looks like an RS12S1X , except for a bit different casting and this one has three mixture screws no lettering on top of cylinder head and a big M (maybe mugen?) on the front of the carb. I can post a picture if needed.
The M on the carb is Mugen, so it's a MR12 or a MT12.
Check if the sleeve sits on top of the crankcase (MT12) or flush (Mr12)