The brass pin wears down and should be replaced.
Part # are for 84-93 , prices are online just to give you ballpark prices
GASKET,CRCS COVER2 (thats the middle gear case gskt)
3JP-15461-01-00 (replaces 3JP-15461-00-00) $2.68
SPRING,COMPRESSION
90501-06022-00 $1.90
POINT, NEUTRAL (the brass pin)
4UN-18542-00-00 (replaces 278-18542-00-00) $0.92
O-RING (that seals the neutral switch, its a orange o ring)
93210-29196-00 $2.82