Just about all the choked engines are the same in this respect. In years of using a manual choke I've yet to see one move from the last position it ws placed in unless someone physically moved it.

However, if you talk to RTK he will tell you about the numerous times his choke went from open to closed when I hit the wrong "rate" switch on his transmitter. Instant off and the plane didn't care what it was doing at the time[:@] I'm sure glad I flew gliders for a long, long time