I just bought a new E10R4AA 9.8 hp from a guy that bought it brand new and never used. It sat covered up in his barn for a year and a half (temp extremes
Right below your arrow has 2 rivets in it that is part of the handle follow it might not be broke. It should fold up flat so the motor will fit.
I've read about the vinegar trick from a few other forums. I'll pull the thermostat next and take a look.
No one here told you vinegar would do any good. if you cannot hold your hand on the head for a slow count to six immediately stop the motor you are overheating
To be clear, Here is a photo with an arrow pointing to the part that seems in the wrong position. Where should it be and in what position? The motor