86 yamaha yfm80 starter wont disengage. ive tried several things. Unhooking ground wire to starter, unhooking wite from start to starter solinoid, light knocking on starter, light knocking on where starter enters engine. It wont disengage. When i give it throttle it dies. Brand new starter. Removed starter from engine wired it up and hit the start button the shaft doesnt move in or out just spins. Tried to pull it wont budge. So is it supposed to stay engaged?