MSD 7423 Installation

Pro Cap Rotor Tip

PN 7411

A new, modiﬁed Rotor Tip is supplied with the Pro Cap Kit, PN 7455, and the Pro Cap Rotor, PN 7423. This Rotor Tip must be used when the ignition timing of the Pro Mag is being retarded.

The modiﬁed Rotor Tip has a 90° corner on one side and a rounded edge on the opposite sid e. Installati on of the Tip depends on the rotation of the Pro Mag. The rounded edge of the rotor must point in the direction of the mag's rotation (the rounded edge is always the leading side). Note that there is also an arrow designating the rotation stamped on both sides of the new Tip.

The reason for this modiﬁcation is because voltage will travel to and from the sharpest point of the rotor tip. By rounding the leading edge of the Tip, the voltage will jump from the sharp point (trailing edge) of the tip which will be closer to the spark plug wire terminal when the timing is retarded. This will produce proper spark distribution even when the timing is retarded (which alters the rotor phasing).

CCW

ROTATION

CCW

ROTATION

The Figures show the Rotor Tip installation.

M S D I G N I T I O N • ww w . m s d i g n itio n. c o m • ( 9 1 5 ) 8 5 7 - 5 2 0 0 • F A X ( 9 1 5 ) 8 5 7 - 3 3 4 4

FRM28561 Revised 04/07 Printed in U.S.A.