MSD Pro Mag Information

Congratulations on selecting the MSD Pro Mag – the most powerful and reliable magneto available!

The following information will answer some of the questions you may come across concerning the

Pro Mag. If you need more assistance, please contact our Customer Support Department at (915)

855-7123 or drop an email to

msdforms@msdperformance.com.

INITIAL TIMING SETUP

A traditional “Buzz Box” cannot be used to set the timing of a Pro Mag because there are no

mechanical points. The Pro Mag incorporates a high output magnetic pickup that ensures accurate

timing and never requires adjustment. Follow these steps to

set timing:

1. Position the crankshaft to your desired timing.

2. Position the generator in the engine with the rotor tip

leading into the #1 terminal of the cap (Figure 1).

3. Start the engine and verify the timing with a quality timing

light such as MSD’s PN 8992 or PN 8991. and adjust timing as

needed.

CONVENTIONAL TIMING VS. THE PRO MAG

When converting from a “conventional” (non-MSD) mag-

neto to a Pro Mag, it may be necessary to review your tune up.

It is common for the ignition timing to accept a few degrees

of retard or an increase in fuel to prevent lean mixtures. Tak-

ing the time to test and tune with small incremental changes

will prove very beneficial.

CAP AND ROTOR MAINTENANCE

Due to the spark energy that MSD Pro Mags produce it is recommended to inspect the cap, rotor

and spark plug wires at closer intervals. The components that are supplied with the Pro Mags are

designed for strength and reliability but still require maintenance. Visually inspect for excessive wear

or carbon tracking. Cap and Rotors are available as a kit from your MSD Dealer:

Cap and

Rotor Kit

PN 7919 (Red)

PN 8119

Generator

Standard Chevy Generator, Pro Mag 12LT (4" cap)

Band Clamp Generators (4" cap)

(12, 20 and 44 Amp Versions)

Pro-Cap: 5" Cap - PN 7408 (red) or PN 74083 (black), Rotor - PN 7423, Base - PN 7456 (red) or

PN 74563 (black) and Rotor Terminal - PN 7411.

PN 79193 (Black)

Parts Included In This Kit:

1 – 44 Amp Pro Mag Generator

1 – Timing Tape, PN 8126

MSD 44 Amp Pro Mag Generator

Clockwise Rotation - PN 8130, PN 81303, PN 81305

Counterclockwise Rotation – PN 8140, PN 81403, PN 81405

Figure 1 Rotor Tip and Cap Alignment.

Distributor Cap

Terminal

Rotor Tip