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
The information transmitted in this message and its attachments (if any) is intended only for the person or entity to which it is addressed. The message may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon this information, by persons or entities other than the intended recipient is prohibited.If you have received this in error, please contact the sender and delete this e-mail and associated material from any computer.The intended recipient of this e-mail may only use, reproduce, disclose or distribute the information contained in this e-mail and any attached files, with the permission of the sender.
From: Richard Cook [mailto:firstname.lastname@example.org]
Sent: Wednesday, 18 March 2009 6:31 AM
Subject: Tri-Spark website enquiry
Message from: Richard Cook <email@example.com>
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?