Digital CDI for Aprilia RS 125 MP

€136.90 *

* All prices incl. value added tax, excl. shipping costs

Ready to ship today,
Delivery time appr. 1-3 workdays


Information regarding the available types see below

  • cdi650-d-aprilia
Digital CDI for Aprilia RS 125 MP Manufactured 1995-98... more
Product information "Digital CDI for Aprilia RS 125 MP"
Digital CDI for
Aprilia RS 125 MP Manufactured 1995-98
  • The parameters of the CDI were determined by Mario Schröter, who kindly made his data available to us. The basis is an original Nippondenso QCA91 CDI (installed in the MP/SF/PY models), which was flashed on the ignition test bench.
  • Wiring plan: Link
  • The CDI is also available as a programmable version that can be configured and further customized by the driver.
Made in Germany
Our CDIs are produced in Germany and have evolved into a true success story over the years.
Digital Design
Our ignition boxes are DC-CDIs and a complete redevelopment of the original CDIs, where many analogue and meanwhile ancient parts were replaced by modern and more robust components.
Replaces the following
Two versions:Improved connector placement:Improved start behavior:
Nippondenso QCA91 dual-line and
The connector is positioned further away from the edge and is better protected against pressure from the seat bench. Ignition is possible for voltages down to 6 volts (e.g. battery aging, cold weather, or long idle times).

Advantages of our digital design

Modern Components

Our digital ignition boxes are DC-CDIs with modern components that have not been available yet when the original CDIs were designed. A sophisticated protection circuit using a special IC protects our CDIs against overvoltages. Thyristors connecting the ignition capacitor with the ignition coil to trigger the ignition were replaced with a modern IGBT. The bipolar transistor of the voltage converter was replaced with an FET with significantly lower switching losses.

Optimized for high-quality fuels

The ignition map of the original CDIs is conservatively designed for normal gasoline (91 RON) or worse. Our CDIs allow you to choose between the original map and another one optimized for high-quality fuels (98 RON). With this configuration, torque, power and efficiency of the engine increase noticeably.

Constant Charging Voltage

The charging voltage of the ignition capacitor remains constant even when the engine reaches maximum speed. In the original CDIs,s a significant voltage drop can occur since the time frame for recharging the capacitor between ignitions decreases.

Efficient Voltage Converter

Our built-in voltage converter is highly efficient. If the battery voltage falls below a critical threshold (e.g. due to cold temperatures, wear and tear, or long idle times), our CDIs compensate the low voltage with a moderate reduction of the ignition voltage instead of a rigorous increase in the resulting current.

Overvoltage Protection

Our CDIs feature an integrated protection circuit using a special IC. While the analogue CDIs can be critically damaged by faulty voltage controllers, our CDIs are protected against overvoltages, voltage reversals, and other risks (such as loose connector contacts).

Easy Fault Diagnosis

All our ignition boxes are equipped with an indicator light (LED) which lights up for 1 ms with every ignition. From about 2000 RPM upwards, the human eye perceives this as permanent light. When the LED lights up, it is ensured that the CDI is powered by the on-board power supply (fuses, ignition switches, kill switches, plugs etc. are therefore OK) and that the pulse generators function. An error in the ignition system can then be excluded with a high degree of certainty. One obvious conclusion would then be that the fault is in the gas/air mixture (test with start pilot recommended).


Two versions available

Our CDIs are available in two versions. Please select the version you want to order from the drop-down list above.

Type: dual-line

This is the "plug & play" version of our CDI - just install and go. In addition to the standard ignition map for 91 RON, the CDI comes with an advanced curve for higher-quality fuels (98 RON). You can switch between the two ignition maps at any time by changing the position of a jumper on the CDI (see illustration).
1) The standard ignition map corresponds to the original and is conservatively designed for the octane number of regular gasoline (91 RON). It makes sense to use this configuration if you are travelling abroad and use gasoline with a low octane rating.

2) The advanced ignition map is the recommended setting and is optimized for high-quality fuel (98 RON). In the medium speed range, the ignition is triggered earlier.


Type: programmable

For technically experienced users, we also offer the CDI as a programmable version. This version can be configured from the computer or laptop via the USB interface within predefined limits. Our software allows adjusting the ignition map, ignition voltage, pulse generator switching edge, sensor type and its parameters as well as the side stand monitoring. The CDI can in principle be used in all motorcycles where either a CDI system already exists or in which such a system can be installed. Both ignition maps of the dual-line version are also available for the programmable CDI via our CDI Tuner software.

(Example image refers to Honda Transalp)
CDI Converter USB cable Laptop/Computer with Windows
In order to program the CDI, it is connected to a computer with Windows operating system via a converter and USB cable. To do this, plug the converter into the six pins of the CDI and connect it to a USB port of the computer via the connection cable. We offer converters and cables separately in our shop, since only one set of accessories is needed for programming several CDIs.
The CDI is programmed with our software CDI Tuner. The software is freely available for download together with the required drivers and can be accessed without purchasing a CDI. There are predefined profiles for all supported motorcycles, which can be modified as desired. All profiles that can be selected in the dual-line version are also available in the programmable version. Links and further information can be found here.
Please check the legal situation regarding modifications. We do not assume any liability for damage or violations of the law.



The CDI has a blue wire jumper (see picture). The jumper must remain intact for motorcycles without side stand control. For other motorcycles, the jumper must be cut (e.g. with a side cutter) to activate side stand monitoring.
Just like with the original CDIs, spark plugs with an integrated resistor must be used, recognizable by an R in the designation (e. g. NGK DPR8EA-9).
The case dimensions of our CDI are different from the original. Dimensions (without plug): 90 x 60 x 20 mm (3.54 x 2.36 x 0.79 inches)


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