Bosch cdi 

Bosch CDI Repair and Restoration

Hard or intermittent failures in these units typically involve a failure of the main power components (high voltage discharge capacitor, power transistor, thyristor or open board traces).  

At the time of manufacture the units discharge capacitor used a technology that is prone to failure with age and use. Simply stated, this part will fail and may cause secondary failures when it does.  Also, components often get damaged by reverse or over-voltage events caused by faulty vehicle charging systems, over-charging  or jump-starting a dead battery.

Servicing the power components in these hand-wired units requires extensive dis-assembly. Defective parts are replaced with modern high-quality devices with performance ratings superior to the original 40-year old parts and as a matter of policy, service always includes replacement of the discharge capacitor with a device that is robust and does not deteriorate with heat and use. 

Contrary to popular opinion, it is not necessary to replace all components in these units.  With noted exceptions, the majority of components used by Bosch are not stressed, are high quality and generally do not require replacement. And, service now includes certain mods to 'harden' these units against voltage transients.  An additional-cost service is also offered to install a rev-limit feature in the unit.

If you suspect your unit is faulty, (or you're tired of crossing your fingers!) then contact  Bob@AshlockTech.com and arrange to send it in for diagnosis and repair.  It's the smart choice compared to substituting another 40 year-old used unit with questionable life expectancy.   Over 700 of my restored units are already back in reliable service!  

Here's what I offer:

CDI Repair and Restoration Service:  $279 plus shipping 

  • Repair, Restore and Test:  YOUR defective unit is repaired, stress-tested and returned to you with a 2-year warranty.  The repair price includes cosmetic restoration (cleaning, bead-blasting and re-labelling) to provide a ‘like new’ appearance as shown above.  FAST turnaround too!

Ready to ship Bosch CDI Units:  $439 plus shipping

  • No core to send in for rebuild?  In a hurry?  An inventory of restored units are kept on-hand for outright purchase and immediate shipment. Why spend over $400 for a salvaged, un-restored, questionable box when you can have one that has been rebuilt & restored, works perfectly and carries a 2-year warranty?  Inquire for availability!

I also buy Bosch CDI cores, working or not.  Offer varies based on condition.


1218 N. Lemon St.
Fullerton, CA 92831

Twin-Plug CDI by AshlockTech

Introducing the AshlockTech Twin-Plug CDI unit.  One box drives two coils! This is a completely new design tor TWIN PLUG 6-cylinder Porsche 911, 4-cylinder type-616 and the unique 4-cylinder Polo Motor applications.  And of course, it can be used in single-plug applications too!
Incorporated in the familiar Bosch housing presents a desirable, period-correct appearance.

Modern electronics to give strong, synchronous sparks.

High efficiency design runs cooler.  The majority of power consumed goes direct to the spark plugs, not as internal heat typical of traditional Bosch units.

Reverse-voltage and surge/dump protected design.

Internal components solidly mounted and resistant to vibration damage.

Familiar 6-pin connector design, or optional flying cable with 6-pin receptacle.

Consistent, regulated output across all rpms, normal input voltage ranges, as well as during cold-start/low-battery situations.

Built-in soft rev-limit programmed for your application.

Triggering by conventional points, electronic points eliminator, or reluctor pickup distributors such as the stock Porsche SC, or JB Racing distributors.

Optimal performance with the original Bosch CDI transformer-coil, or aftermarket CDI coils with similar parameters.

Available now. 

These are built-to-order, priced at $700, or $550 if you donate a core.  Inquire.

1218 N. Lemon St.
Fullerton, CA 92831


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