Yes, it's a MT42. I have one, so far I just test ran it to set the carb, runs well, does have that shake in lower rpms, but all single cylinder engines have shake most shake just above idle, this is a little higher, no problem. Mine is going in a Celmark S2 Pitts. Casting quality is very good seems to be well made, it started easy, tuned straight forward with out a problem. I ran mine with a 20x8, I wish I could tell you the rpms, but if I don't right it down right then I don't remember, getting old is a *****.