Kohler V-Twin DSAI to MDI Ignition Upgrade
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 Published On Jul 10, 2022

Step by Step!

Today we'll be working on a Craftsman DGS6500 riding lawn mower that has a #Kohler #Courage #SV735 engine.

One of the engine's ignition modules failed, and is no longer producing spark. This is a V-twin, so the engine will still run, but will only run on 1 cylinder.

You may notice a loss of power, and white or black smoke coming from the muffler or exhaust. This is due to unburnt fuel in the cylinder going into the exhaust.

In this video, I explain how these older DSAI ignition modules work, why they failed, and I'll also take you through the process of replacing them with Kohler's upgraded ignition magnetos.

Skip to 7:50 to show the wiring, and skip to 20:31 for the installation of the new ignition modules.

The old ignition system is called DSAI for Digital Spark Advanced Ignition, and we'll be upgrading them to a MDI system, which stands for Magneto Discharge Ignition.

This is a complete upgrade kit, which includes newer, solid state ignition coils that are superior in design to the older ignition system.

Unlike the older Ignition Modules, that required 12v, these newer ignition magnetos do not require 12v power.

Since the new ignition system doesn't require 12v, there are 2 ways you can install this kit.

1. Leaving the original ignition wiring harness attached.
2. Removing the original ignition wiring harness completely.

I show you how to do both ways in this video, as removing the wiring harness completely may require you to connect the Fuel Shut-Off Solenoid to a source of 12v.

Either way, we'll be wiring into the Red and White wire.

Note: some engines have the Red/White wires located near cylinder 1, and others may have them located near cylinder 2. The steps are the same.

Additionally, some engines will have a separate 12v power wire going to the Fuel Shut-Off solenoid, which means you can disregard those steps in the video.

Here are the part numbers for the upgrade kit for various Kohler V-twin engines, it covers both the Courage and Command engine models;

CH/CV740 - 25 707 03-S
CH/CV750 - 25 707 03-S

SV735/740/840 - 32 707 01-S

These kits upgrade the old Ignition Module part numbers;

CH/CV740, SV735, SV740: Previous Modules 24 584 52, 24 584 63 24 584 53, 24 584 64, 24 584 89, (Upgraded Module with Diodes 24 755 172-S)

CH/CV750: 24 584 90 (Upgraded Module with Diodes 24 755 173-S)

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