Re: throttle
Give it a good pull straight out where the base of the lever goes into the control box and it should come out. Sometimes they require you to disassemble them, as they get crudded up inside. May need a good cleaning as they can be stubborn sometimes. Also, jockey the throttle forward and reverse a bit to see if that helps while pulling. May not be perfectly centered for it to pull out. Could be a linkage adjustment at the motor also.