The Pro Mag 44 uses a proprietary combination of rare earth magnets and windings to produce its ignition energy. A magnetic pickup mounted in the lower base accurately triggers the eight precision paddles on the reluctor, eliminating the wear and inaccuracy of points, and the assembly spins on a 0.500-inch shaft with sealed ball bearings for long life. When triggered, the signal routes to the Electronic Points Box, which controls spark duration and directs it to the 44's coil — each winding hand-wound with over a pound of copper wire for accuracy — before voltage is stepped up and distributed through the mag's cap to the correct spark plugs. The design supports optional accessories like a crank trigger, Timing Retard Control, or a rev limiter.
Specifications:
- Rotation: Clockwise (CW)
- Color: Black
- Cap Size: Standard
- Drive: Cross Drive
- Retainer: Band Clamp, Wire Retainer
- Shaft: 0.500-inch, sealed ball bearings
- Type: Magneto Generator
- Part Number: 81303
Compliance: This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).
FAQ
What does the MSD 81303 Pro Mag 44 generator do?
It's a magneto generator that produces up to 44 amps of primary current using rare earth magnets and hand-wound coil windings, distributing spark to the correct plug through its cap and rotor.
What shaft and bearing setup does it use?
It spins on a 0.500-inch shaft with sealed ball bearings for long service life.
Can I add a rev limiter or crank trigger?
Yes, the design supports optional accessories like a crank trigger, Timing Retard Control, or a rev limiter.
Is this magneto legal for street use?
No — it's legal for Racing Use Only vehicles that are not registered or operated on the street.
