Motorcycle Stator Bar Coils
Many older motorcycles, particularly smaller displacement enduro/off-road models, used what are called "Bar Coil" type stators. A bar coil is very simple, consisting of a metal 'bar' core in a straight or curved shape, with some insulation to protect the windings. Solid copper wire with high temperature insulation is then wound around the core in a single phase type winding, creating a bar coil. They can be wound for either ignition, battery charging, or lighting use, and can be configured for inner and outer flywheel/rotor use. The bar coils are usually mounted on a metal backing plate, which is then attached to the engine or sidecase, surrounding the crankshaft.