Depends on how much pipe you have installed, e.g., the weight of the whole thing.
I bought a tiller engine that had a 2-3” length of straight iron pipe, a 90 degree elbow plus the large Briggs sausage muffler. Port is intact.
A brace is not a bad idea though, especially if you’re going all Evel Knievel and stuff, landing hard and getting jettisoned from your bike. :laugh: