I realized that the CRRC GF50I doesn't really allow to put in a choke servo. It's one of those deals where you engage the choke and then, when you hit the throttle, the choke gets "unchoked" by a spring. So only a throttle servo, fine by me! :-) I put in a Futaba 3004, but then decided to put in one of my DS821 digital servos, because I got some laying around anyway. No big deal.