My starter won't disengage from the flywheel on my 1990 Force 90 outboard. I can get the engine to start, but the starter won't pop back down. The flywheel just turns it. I haven't run it more than a couple seconds with the starter engaged because I don't want to burn the starter out. The problem initially happened because the nut on top that holds the spring down came loose. I've tightened it very tight, but that didn't help.