Got an 88 FLHTC. When I replaced the solenoid the bike would crank but wouldn't stop when I let go of the starter button. Long story short, I ground off 1/16" from the solenoid shaft that goes into the plunger and it worked. Since there are no adjustments to be made in this area I can't for the life of me understand why this problem surfaced. I bough tthe bike used but all the parts in the primary are OEM. Can you suggest what the core cause may be?