I got a quick reply back from Tri Spark, a good sign.
Thank you for your interest in the Tri-Spark ignition. Your coils will be fine to use. The minimum resistance spec is 3 ohms for the Tri-Spark.
Regarding the kickback - we've been selling these kits for about a year now with the anti kick back claim and nobody has called or emailed to say they had a problem. In fact here's an email from a customer in the UK.....
Hi Steve - just to let you know that I fitted the Tri-Spark 'Classic-Twin' to my 920 Commando yesterday - it started easily first kick !!! - brilliant - it was always good with the 'old' Tri-Spark that I had fitted but this is just outstanding. The 'anti-kickback' system certainly works as I stopped and started it about thirty times during my 75 mile test ride and not once did I get any symptom of kickback.
Please let me know if you have any other questions,
Tel: +61 8 8371 1664
Fax +61 8 8371 0839
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From: Richard Cook [mailto:email@example.com]
Sent: Wednesday, 18 March 2009 6:31 AM
Subject: Tri-Spark website enquiry
Message from: Richard Cook <firstname.lastname@example.org>
I currently have a Norton Commando engine in a special fitted with a Boyer. It has two 12 volt high performance coils that are under four ohms together.
The Boyer tends to give me a starter kick back now and then.
Will your unit eliminate the kickback?
Will your unit work with my current coils?