.040
ALL Twin Cam engine plugs are a .040 gap
On a 2005 Harley Dyna Low Rider, the oil drain plug is located on the bottom of the engine's oil pan. It is typically a hex or socket-style plug, easily accessible from beneath the motorcycle. To drain the oil, you will need to position a suitable oil catch pan underneath the plug and remove it carefully. Always ensure the engine is warm but not hot for optimal oil drainage.
The oil drain plug on a Harley Davidson 003 Dyna Wide Glide is located on the left side of the oil drain pan. The right side contains the transmission drain plug.
on the bottom of the oil pan
The suggested spark plug gap for a 1973 Harley Davidson is 0.040. It is the suggested gap for most of the spark plugs of that era.
If it's points or a Dyna S ignition you set the plugs at 28, other wise you set the plugs between 38 - 40
.040"
The correct spark plug gap is 40 thousands on a stock harley plug
On a 1993 Harley Davidson Low Rider custom, the transmission drain plug is underneath the transmission. The filler plug is on the side of the transmission case.
Look underneath the bike by the kickstand spring stud.
.038 to .042 depends on spark plug brand.
The spark plug gap should be .040"