Hello there, it's nice to see someone is playing Full Throttle in 2011
So. The word "Coat" can also be interpreted as a derogatory term. When he says "Take this coat and go get his motorcycle" i believe he refers to Ben.
I agree with you on the theory that Nestor and/or Bolus returned to the Kickstand, sabotaged the bike and threatened the bartender to stall Ben, but i believe the "coat" was Ben, it had nothing to do with Ben's leather jacket.
As for the vechicle they used to come back to the Kickstand, later on in the game they drive a different hovercar, the blue one that you take the fan from. It's possible that they used that one.
Of course, in every game or movie such plot gaps can sometimes be inevitable. Nice one on this, but we really don't have to judge the developers for these gaps.