Yeah I'm gonna just leave the servos that came on it because they seem to work pretty good. Just need to do some tinkering with the throttle linkage.

Forgot to say that only the futaba servo has a horn on it. I'm probably just going to sell the extra ones because Idon't really have a use for them.

For now I'm just left with the question about rolling it. Should it be really smooth, or is it normal for it to be a little rough, like there's some internal resistance somewhere?

EDIT:
So I emailed the seller and he said he's send the battery, charger, and wand on saturday. In case I do need a new engine, what do you all recommend, roto or pull start? I'm leaning towards pull, just so that battery doesn't die while I'm out and I get stuck not being able to even start the engine