Drakhen99
The Forrest Gump of Motovloggers
No, I can start and stop both of my cameras easily while riding. To sync them up I just add a clap at the start, that makes it easy to sync when editing.
I did that once, and it was a PITA to get them synced. I didn't clap though, so that might be it, but my Hero 8 picks up so much wind noise at speed that the audio would be unusable anyway. I just guessed, got close, and then fine-tuned it from there.
The footage is actually in my latest vlog, wherein I rode to All-American Harley. Everything from my "check in time" to the dealership was synced manually, as I described above.
-John