Convert Tomos 25 km/h Ignition To 45 km/h | Electronic Ignition Guide

Estimated read time: Calculating... | Originally published: December 27, 2022 | Latest update: May 12, 2026

Convert a Tomos 25 km/h electronic ignition setting to 45 km/h

Do you want to convert a Tomos with a standard 4-coil electronic ignition from the 25 km/h “snor” setting to the 45 km/h “brom” setting? Then the ignition base plate needs to be moved to the correct timing mark.

In this guide, we explain how to adjust a Tomos electronic ignition without pick-up, which timing marks to use, and which tools you need to remove the flywheel safely.

Quick answer: This adjustment only works for a standard Tomos electronic ignition without a pick-up module. If your ignition has a pick-up sensor near the flywheel, this is not the correct adjustment method.

When this adjustment works

This guide is for a Tomos with a standard electronic ignition, also known as the 4-coil ignition. With this ignition type, the snor or brom position can be adjusted by rotating the ignition base plate.

Important: this adjustment only works for ignitions without a pick-up module. The pick-up is a black sensor block mounted at the lower right side near the flywheel. Not sure which ignition you have? Read our guide about the Tomos A35 ignition with pick-up.

Important: If your Tomos engine is still completely standard 25 km/h specification, only moving the ignition usually will not be enough. First make sure the correct parts for a 45 km/h brom setup are fitted.

Snor position and brom position

On the crankcase next to the ignition plate, there are two marks. These marks indicate the snor position and the brom position. A 25 km/h Tomos is normally set to snor position, which is the lower mark. If you want to convert the moped to a 45 km/h brom setup, the ignition needs to be moved toward brom position.

Tools and parts needed

Besides standard tools, you need a few specific items to remove the flywheel and adjust the ignition base plate safely.

Tool or part	Why you need it	Link
Flywheel puller M26x1.5	Used to safely pull the flywheel from the crankshaft.	View flywheel puller
Piston stop M14	Used to lock the crankshaft so you can loosen the flywheel nut and use the flywheel puller.	View piston stop
Socket wrench or ring spanner	Used to loosen the crankshaft nut and operate the flywheel puller.	View socket set
Allen key or screwdriver	Used to remove the kickstart cover and loosen the ignition base plate bolts.	View tools

Note: If an aftermarket electronic ignition is fitted, the base plate may not have a clear timing mark. Check this before you start.

Remove the flywheel

First remove the flywheel cover or kickstart cover so the flywheel is visible. Loosen the socket screws, remove the kickstarter, and then remove the cover.

Next, unscrew the spark plug from the cylinder head and screw the piston stop into the spark plug hole. Carefully turn the flywheel counterclockwise until the piston rests against the piston stop. This locks the crankshaft so you can loosen the flywheel nut.

Use a 10 mm socket to loosen the crankshaft flywheel nut. Once the nut is removed, thread the flywheel puller into the flywheel by hand.

Tomos flywheel puller threaded into flywheel for ignition adjustment

Now turn the bolt on the flywheel puller with a ring spanner or socket wrench. The flywheel will come loose from the crankshaft. Place the flywheel down carefully with the magnets facing upward.

Tomos flywheel removed with flywheel puller

Set the ignition to brom position

With the flywheel removed, you can see the electronic ignition and its four coils. The base plate is held in place by two bolts. These are often Allen bolts or crosshead bolts. Loosen them slightly so the base plate can be rotated.

Tomos four coil electronic ignition and base plate

Look to the left of the base plate. You will see two marks on the crankcase and a mark on the base plate. The lower line on the crankcase is the snor, or 25 km/h, position. The upper line is the brom, or 45 km/h, position.

The mark on the base plate shows the current ignition position. By rotating the base plate clockwise, you can move the ignition setting toward the brom position. This adjustment is quite precise, so move the base plate only a little at a time and test the result.

Tomos ignition timing marks for snor and brom position

Work carefully: Test the result after each small adjustment. Do not rotate the base plate too far in one step. TomoShop is not responsible for damage caused by incorrect installation or adjustment.

What parts do you need for a 45 km/h brom setup?

Want to convert your 25 km/h Tomos to a 45 km/h brom setup? Adjusting the ignition is usually not enough by itself. You also need the correct engine setup.

Continue reading: Check which parts you need here to convert a 25 km/h Tomos to a 45 km/h brom setup.

If you use your Tomos on public roads, always check whether your setup matches the local rules for inspection, insurance, registration, and road use.

FAQ: Tomos electronic ignition adjustment

Does this adjustment work on a Tomos ignition with pick-up?

No. This guide is for a standard Tomos 4-coil electronic ignition without a pick-up module. An ignition with pick-up uses a different type of timing control.

Which mark is snor position and which mark is brom position?

The lower line on the crankcase is the snor, or 25 km/h, position. The upper line is the brom, or 45 km/h, position. The mark on the base plate shows where the ignition is currently set.

Do I always need a flywheel puller?

Yes. Use the correct flywheel puller to remove the flywheel safely. Do not try to pry the flywheel off with screwdrivers or incorrect tools, because this can damage the flywheel, crankshaft, or ignition.

Is adjusting the ignition enough to convert a Tomos from 25 km/h to 45 km/h?

Usually not. If your Tomos is still completely standard 25 km/h specification, you also need the correct engine parts and setup for a 45 km/h brom conversion.