How to Find Your Evinrude EMM Part Number

Every Evinrude E-TEC carries a small computer called the Engine Management Module, or EMM. It runs the fuel and ignition, and it also holds the software map that sets your rated horsepower. Before anyone can tell you whether your engine can be reflashed to a higher HP, one thing is needed: the EMM part number. This guide shows where the module sits, where the number is printed, what it looks like, and how to check it against the upgrade options.

Where the EMM sits on the engine

The EMM is mounted on the powerhead, under the top cowling. Pull the cowling off and look for a sealed black module roughly the size of a paperback, bolted to the side of the block with a bundle of wiring harness connectors plugged into it. It is not the ignition coil pack and it is not the fuel rail. It is the boxed control unit that the main harness feeds into. On most E-TEC models it is easy to reach once the cowling is off, and you do not need to remove anything to read it.

Where the part number is printed

On the face of the module is a printed label, and that label carries the Evinrude part number for the EMM. That is the number we work from. Wipe the label clean if it is covered in salt or grime, because the digits can be hard to read on an engine that has spent seasons in the weather. Photograph the whole label with your phone rather than copying it by hand: a clear photo lets us confirm the number with no transcription mistakes. The part number identifies the engine block inside your powerhead, and that is the fact that actually decides whether a tune is possible.

What the number looks like

E-TEC EMM part numbers are short numeric codes, seven digits on most units and six on some of the older big block modules. Real examples from the blocks we tune:

• 5006040, 5006041, 5006042
• 5008164, 5008165, 5008558
• 586320, 586321, 5008557

If your label shows one of these, you are looking at a block we already have a mapping for. If it shows something else, send it anyway: the checker covers more numbers than the short list above.

Why the part number decides your upgrade

Evinrude built several horsepower ratings on the same engine block. A 15 and a 25 can be the same small block casting. A 40, 50 and 60 can share the mid block. A 75 and a 90 can share the big block. What separates the ratings is the EMM software, not the metal. Because the block is shared, reflashing the EMM to the higher factory map raises the rating without touching the hardware. The part number tells us which block you have, and therefore which higher rating it can reach.

One detail on the mid block: going to 60 HP needs a thermostatic water valve, which we supply as part of that upgrade. The step to 50 HP does not. Note also that the same part number is shared by the lower and higher variant of a block, so a single number can map to more than one target. That is why we confirm exact eligibility per part number rather than by rating alone. You can read the full path for your block on its own page, for example the mid block route at /en/emm-tuning/40-60 or the big block route at /en/emm-tuning/75-90.

How to check your number

Once you have the number, you do not have to email us to find out what is possible. On the tuning hub there is an instant part-number checker: type your EMM part number in and it immediately shows the upgrade options for that block. The steps are simple:

1. Pull the cowling and find the EMM on the powerhead.
2. Read or photograph the part number on the module label.
3. Enter it into the instant checker on /en/emm-tuning.
4. Review the target rating, then choose remote or mail-in.

Both remote and mail-in reflashes start at 199 euro ex VAT, so the part number decides the outcome, not the method you pick. If you want the background on how the reflash itself works before you check, read /en/blog/how-to-unlock-more-hp-evinrude-e-tec. For the number check, the hub is the fastest route.

Check your part number now

Find your EMM part number on the module label, then enter it into the instant part-number checker on /en/emm-tuning to see exactly what your engine can be tuned to. Over 100 EMMs tuned so far, shipped worldwide by DHL Express from our workshop in Nieuwkuijk.