I have an MVVS 40 in a SIG Midstar 40. It also has a tuned muffler. So I set it a little richer than normal on the ground. As the engine comes on the pipe it leans out some. This is normal for a piped engine. It is also a high compression engine. I am also running 10% fuel without problems I might add.

It will occasionally just load up and stop while taxiing. I just go out and carefully flip it over. It usually just fires back up. I clear it out, taxie and fly it. Done it a number of times.

Mark Shuman