89 Toyota Supra N/A won't crank

[f00g00]

I had the same problem recently, car sits for a couple of days and it wouldn't start unless I jumped it. My starter was the culprit, it apparently required more cranking amps then my system had after sitting for a few days. I got a used one and it starts now no problem.
The top bolt on mine has a removable nut on the back that is on the bellhousing, I don't know if thats origional or not but thats the way mine is.