AC-CDI v10


  • Programmable AC-CDI
  • For ONE or TWO* cylinders
  • For [2 strokes engines] and for [4 strokes engines with wasted spark*]

    * On 4stk engines with 1 pickup on the crankshaft, one spark occur at compression stroke and one at exhaust stroke. Firing in the exhaust stroke is a wasted spark. Hence the name…

  • 80MHz MicroController control unit
  • Easy programming with USB connection and terminal console
  • Compatible Windows, Linux, Mac
  • One programmable ignition curve
  • Rev from 10 to 20,000 RPM
  • 0 deg advance from 1 to 500 RPM (to avoid kickback)
  • Adjustable timing in 13 steps from 500 to 20,000RPM
  • Soft rev limiter.
  • Stator can be half or full rectified (for more power and ground isolation).
  • 1 input for an inductive pickup (VR) or Hall type or Points
  • Pickup polarity can be set to Positive, Negative or Automatic detection.
  • 1 output for a Capacitive coil type.
  • Non volatile configuration
  • LED Indicator
  • Kill switch input
  • Power supply voltage DC 10 to 16 volts
  • Current drain: 100mA
  • Protected against reverse supply voltage
  • Available as a ready-to-use device in the SHOP section
  • Dimensions: 100 x 60 x 25mm (3.9 x 2.4 x 1inch)
  • Plastic box potted for Electrical insulation, Protecting components from mechanical shock and vibration, thermal shock or Moisture
  • 15cm(6”) 1.5mm2(16AWG) wires soldered with 6.3mm automotive female connector
  • Available as a naked KIT in the SHOP section
  • No box, no wires
  • Dimensions: 80 x 45 x 30mm (3.2 x 1.8 x 1.2inch)
  • Source not available
  • Made in France


If there is one separate pickup:
=> This AC-CDI works.
If there are 2 separate pickups (one for low RPM and one for High RPM):
=> This AC-CDI works.
If there is no separate pickup and the timing is done by using the High Voltage of the stator:
=> This AC-CDI will NOT works
If the engine works with Missing Teeth:
=> This AC-CDI will NOT works

* Twin-cylinders at 360° crankshaft angle:
The engine works with WASTED spark.
If there is ONE twin coil:
=> This AC-CDI works.

See: CDI compatibility

Remember that ignition coils are different from TCI to CDI system
– CDI coils have low inductance and impedance around 0.5-0.8ohm
– TCI coils have higher inductance and impedance around 1-3ohm

Remember there are AC-CDI and DC-CDI…


– 1 input for inductive pickup with 1 signal per crank rev.
– Pickup must puts out 3 to 30Vac
Points, reluctors, Hall sensor, optical sensors can be used as long as they give only 1 pulse per revolution.
– This CDI is not compatible with multi-pulses pickup or missing tooth wheel.

Rev Limiter:

The last RPM value you enter is the “rev limit” that stop all sparks.

Ignition timing

Draw the ignition timing in this XLS sheet.

Terminal console

Click here for more info
CoolTerm for Win/Mac/Linux
Teraterm, Putty, Kitty for Win
– Console commands for Mac:
ls /dev/*usbserial*
screen /dev/cn.usbserial-xxxxxxxx 115200 -L
screen /dev/tty.usbserial-xxxxxxxx 115200

– Console commands for Linux:
3 ways to find the COM-port:
tail -f /var/log/syslog | grep USB
dmesg | egrep --color 'serial|ttyS'
ls /dev/ttyUSB*

Config port:
sudo su
stty -a </dev/ttyUSB0
stty -F /dev/ttyUSB0 cs8 115200 time 10

cat /dev/ttyUSB0 & cat > /dev/ttyUSB0

HowTo setup

Setup ACCDIv10r1.pdf


Ready-to-use unit:
For Half-Rectification and Common ground.
For Full-Rectification and Isolated ground. (More power)

Kit unit:
For Half-Rectification and Common ground.
For Full-Rectification and Isolated ground. (More power)


Click here for more info


Click here for more info

Connection to the box:

Setup a ignition timing:

Change the ignition timing:

Test of an ACCDIv10:


Click here for more info

  • Version v10r0c0:

    • First Version.
    • 5 seconds temporization to detect console.
    • Wires come out at 90degrees.
    • LED on the length side.

  • Version v10r1c0:

    • Automatic detection of the console.
    • Wires come out at 180degrees.
    • Stator can be half or full rectified.

9 thoughts on “AC-CDI v10”

      1. I’ll be very interested in how it works out on the xt200. I have 2 of them I’m rebuilding and have been looking for a good cdi solution. Thank you so much for all of this.

    1. Hi Mark,
      Beware ! AC-CDI v10r0c0 dont use Wifi but use direct USB connection for setup.
      The 2 last prototypes are available now in the Shop and I going to order some new PCB for the modification I had to make. (AC-CDI v10r1c0) So the next sell will be in April…

      I had good feedback from the guy who tested it on Yamaha XT200 – 1982. Some videos will come soon.
      PS: ACCDI v9 was Wifi but it’s End Of Live now. ACCDI v10 is much more accurate than v9

    1. Hi,
      thanks for your interest. The last one will be available next week and before 31 of May.
      Then a period of 2 or 3 weeks for restock then a bunch of 10 should be ready for the 15th of June.

  1. Hi Thierry,
    I bought an AC-CDI v9 Last year that works pretty good in my XT600 but not really constant. So I want to try the new V10. When will it be available again?

    1. Hi Markus,
      thanks for your interest.
      Are you looking for a ready to use version (with box+wires+resin) at 70€ or a kit (all parts soldered on the PCB) but no box, no wires, no potting? The cost would be around 55€.
      I have one kit ready.

      you can also PM me at frtransmic [at]

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