MSD 89501 Installation

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MSD RPM Activated Switch

PN 89501 - 1-Cylinder, 4 Stroke 720° PN 89502 - 2-Cylinder, 4 Stroke 360°

1-Cylinder, 2 Stroke 360°

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Important: Read the instructions before attempting the installation.

Parts Included In This Kit:

1 - RPM Switch 4 - Self Tapping Screws

Note: RPM Modules must be purchased separately. See the chart on page 4 for part numbers.

PN 89501, 1-CYLINDER, 4-STROKE (720°) ENGINES

This RPM Switch is preset for an ignition trigger, that ﬁres every 720° of crankshaft rotation. This particular Switch may not be programmed for any other conﬁgurations. This unit is typically used on a multiple cylinder engine, which has a Coil-per-Cylinder ignition system.

PN 89502, 2-CYLINDER, 4-STROKE (360°) ENGINES OR 1-CYL, 2-STROKE (360°)

4 - Heat Shrink Caps

This RPM Switch is preset for an ignition trigger that ﬁres every 360° of crankshaft rotation. This particular Switch may not be programmed for any other conﬁguration. This unit is typically used on a waste spark ignition system equipped with a dual tower coil that ﬁres two cylinders. This coil is triggered every 360° of crankshaft rotation. This RPM Switch may also be used on a single cylinder, 2-Stroke engine.

Note: If an MSD Ignition is used in conjunction with an RPM Switch an alternate RPM Switch may

be needed.

The RPM Activated Switch can be connected to stock ignition systems or an MSD Ignition. When using a capacitive discharge ignition such as an MSD, do not connect the Switch to the coil negative terminal. Damage to the Switch will occur.

The Switch is capable of carrying 1.5 amps of current. If the circuit you are activating requires more current, an MSD Relay, PN 8960 or PN 8961 must be used. The MSD RPM Activated Switch is equipped with a “smart driver”. This circuit will protect the RPM Switch from damage by monitoring its temperature. If there is an inadvertent short or too much current is drawn through the Switch, the smart driver will sense the increase in temperature and shut the Switch off. However, once the temperature drops to a safe point, the smart driver will turn the Switch back on. It will continuously cycle On and Off as the temperature dictates.

If you experience a problem with your Switch not operating, turn the circuit off for a few minutes to cool then try again. If the circuit activates then shuts off, there may be too much current ﬂow. Check the device's Installation Instructions to ﬁnd its recommended maximum current.

The RPM Switch has two activation wires. The Yellow wire is Normally Open and will activate a circuit by switching to ground. The Gray wire is Normally Closed to ground and will open the ground circuit at the desired RPM (Figure 1). If no RPM module is installed, the Switch will not activate the circuit.

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2 INSTALLATION INSTRUCTIONS

Figure 1 Operation of the RPM Activated Swtich.

MOUNTING

The Switch may be mounted under the hood as long as it is away from direct engine heat sources. Keep in mind that the rpm modules should be easy to access for changes. The Switch can be mounted with the double-sided tape or with the four self tapping screws supplied. Use the Switch as a template and mark the mounting hole locations. Remove the Switch and drill the holes using a 3/16" drill bit then install the screws.

WIRING

Red Connects to a switched 12 volt source.

Black Connects to ground. White The rpm input wire. With an MSD Ignition, this connects to the Tach Output terminal.

Yellow This is an activation wire and is Normally Open and will switch to ground. It connects

Gray This is an activation wire and is Normally Closed to ground. It will open the ground

path of a circuit.

On inductive ignitions, it connects to the coil negative terminal.

to the ground side of the device you plan to activate.

Figure 2 Wiring to a 4-Cylinder, Coil-per-Cylinder Ignition.

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INSTALLATION INSTRUCTIONS 3

PN 89501 - MSD Unit must be used on single cylinder application.

PN 89502 - MSD unit must be used on 2 cylinder 4 stroke engine (waste spark).

Figure 3 Wiring to an MSD Ignition Control.

Figure 4 Wiring a PN 89502 to an inductive ignition.

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RP M Module Kits are supplied with ﬁve modules in a range of 200 rpm increments. There are even numbe r sets a nd od d number sets available. Example: PN 8746 includes 5,000, 5,200, 5,400, 5,600, 5,800 modules.

RPM MODULE KITS

EVEN INCREMENTS

3,000-3,800 4,000-4,800 5,000-5,800 6,000-6,800 7,000-7,800 8,000-8,800

9,000-9,800 10,000-10,800 11,000-11,800

PN 8743 PN 8744 PN 8745 PN 8746 PN 8747 PN 8748 PN 8749 PN 8750 PN 8751

ODD INCREMENTS

3,100-3,900 4,100-4,900 5,100-5,900 6,100-6,900 7,100-7,900 8,100-8,900 9,100-9,900

PN 87431 PN 87441 PN 87451 PN 87461 PN 87471 PN 87481 PN 87491

RPM Selectors feature a dial that allows you to choose between 12 different rpm limits in 200 rpm increments.

For rpm settings below 3000 rpm, MSD offers an adjustable Module,

RPM PART NUMBER

3,000 - 5,200 PN 8670

4,600 - 6,800 PN 8671

6,000 - 8,200 PN 8672

7,600 - 9,800 PN 8673

9,000 - 11,200 PN 8674

PN 8677

Service

In case of malfunction, this MSD component will be repaired free of charge according to the terms of the warranty.

When returning MSD components for warranty service, Proof of Purchase must be supplied for veriﬁcation. After the warranty period has expired, repair service is based on a minimum and maximum fee.

All returns must have a Return Material Authorization (RMA) number issued to them before

being returned. To obtain an RMA number please contact MSD Customer Service at 1 (888) MSD-7859 or visit our website at www.msdperformance.com/rma to automatically obtain a number and shipping information.

When returning the unit for repair, leave all wires at the length in which you have them installed. Be sure to include a detailed account of any problems experienced, and what components and accessories are installed on the vehicle. The repaired unit will be returned as soon as possible using Ground shipping methods (ground shipping is covered by warranty). For more information, call MSD at (915) 855-7123. MSD technicians are available from 7:00 a.m. to 5:00 p.m. Monday - Friday (mountain time).

Limited Warranty

SD warrants this product to be free from defects in material and workmanship under its intended normal use*, when properly installed and purchased from an authorized MSD dealer, for a period of one year from the date of the original purchase. This warranty is void for any products purchased through auction websites. If found to be defective as mentioned above, it will be repaired or replaced at the option of MSD. Any item that is covered under this warranty will be returned free of charge using Ground shipping methods. This shall constitute the sole remedy of the purchaser and the sole liability of MSD. To the extent permitted by law, the foregoing is exclusive and in lieu of all other warranties or representation whether expressed or implied, including any implied warranty of merchantability or ﬁtness. In no event shall MSD or its suppliers be liable for special or consequential damages. *Intended normal use means that this item is being used as was originally intended and for the original application as sold by MSD. Any modiﬁcations to this item or if it is used on an application other than what MSD markets the product, the warranty will be void. It is the sole responsibility of the customer to determine that this item will work for the application they are intending. MSD will accept no liability for custom applications.

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FRM28978 Revised 02/12 Printed in U.S.A.