RE: 9C TWIN ENGINE SYNCING
I did this a couple of weeks ago of my Tri-Stick. I have the center engine on channel 3 and the two outboard on 6 and 7. You have to mix the kill switch to channel 6 and 7 and it will work perfectly. I do not remember the specifics, but if you like email me and I will look at the radio when I am at home.
Good Luck
Scott