Thanks for contacting us.
We produce a Smart Fire system for British unit twins with dual plug head (PD2TP).
The dual plug head version has a reduced advance range (32° full advance, instead of 38°).
The reduced advance is generally more suited to a dual plug head engine.
This system is also designed to drive two dual digital coils, supplied with the kit.
http://www.pazon.com/ignition-system/sm ... n-twinplug
Note that the advance curve ('map') is fixed in the ignition module, and cannot be changed.
This system is currently showing as 'sold out' (out of stock), as we are out of the rotors used in the digital twin systems.
However, we do have some old style rotors which have timing reference holes, instead of slots (as shown on the website).
Also, the trigger (pickup) unit that works with this style rotor is a little different to the later type.
Please see attached photos of the old style rotor plus compatible trigger.
The system works the same basic way as the later design, though.
Please see attached installation booklet for the old style system.
The main reason we changed the rotor design to slots was due to variations in camshafts and points housings with some bikes.
In a small number of cases this resulted in an excessive air gap between the top of the timing disc and the sensor on the underside of the trigger.
The later slot design allows for a wide variation of the trigger's position/height.
If you are able to wait a few weeks, we can email you we have new stocks of rotors in.
Alternatively, if you would like an ignition system much sooner, before ordering the old style system it would be worth taking a measurement, so we can check the air-gap will be within limits when our parts are installed. The main measurement would be the distance from the rim of the points housing (where the CB assembly sits), to the end of the camshaft.