MSD 8677 Installation

Adjustable Low RPM Module

PN 8677

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Parts Included:

1 – Adjustable Low RPM Module 1 – Small Screw Driver

This Adjustable Low RPM Module is designed to be used with any of the MSD Rev Control components or accessories that use the standard white MSD RPM Modules. It cannot be used on the MSD Engine Governor, PN 8725.

Note: Solid core spark plug wires cannot be used with an MSD Ignition Control or MSD Timing and

RPM Accessories.

OPERATION

The Adjustable Module has a screw in its side that controls the rpm amount. The range of limit is from about 1,000 – 3,000 rpm, depending on the application. One turn is roughly equal to 100 rpm. The Module is set at the factory with the adjusting screw turned all the way in which is the highest rpm.

Note: The adjusting screw is a multi-turn

pot. This means that it will still turn even when the minimum or maximum rpm is reached.

The best way to set the desired rpm is with an MSD Ignition Tester, PN 8998. The Tester will simulate the ignition running so the Module can be set without running the engine. If a Tester is not available, run the engine and set the rpm using a tachometer.

WARNING: High voltage is present on the coil terminals. Do not touch the coil terminals

when the engine is cranking or running.

ONE TURN = APPROXIMATELY 100 RPM CW = INCREASE RPM LIMIT CCW = DECREASE RPM LIMIT

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TECH NOTES

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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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FRM28991 Revised 01/12 Printed in U.S.A.