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Electronic ignition (thorspark)

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Electronic ignition (thorspark)
Started at 06:46pm on the 8th November, 2018 by calv
calv Subject: Electronic ignition (thorspark)
Hi everyone. I have fitted Thor spark electronic ignition to my k2f magneto,and the Connie is running well. My only issue is when I go to restart the bike sometimes ie switch ignition on , I get a surge and smoke from the back of the carb . Sometimes a bit of a pop. I know that when I switch on,both plugs spark and it's probably igniting fuel vapour left in the combustion chamber. Has anyone had this trouble? And are other electronic ignitions the same. Many thanks calvin
Posted: 06:46pm 8th November, 2018
Mark M Subject: Electronic ignition (thorspark)
Yes, it's quite common. The system uses a 'wasted' spark so both plugs fire at the same time. This means that while one cylinder is on the firing stroke the other is on the inlet and as you say, there is sometimes enough fuel present to ignite and cough back. Even some bikes fitted with electronic ignition can sometimes do it, my 1980s BMW does now and again.

REgards, Mark
Posted: 07:42pm 8th November, 2018
calv Subject: Electronic ignition (thorspark)
Thanks Mark! If it's common I will learn to live with it. Have no problems at all when running . starting well ,idling good and grunts like a gooden. As long as no flames I'll be happy
Posted: 08:42pm 8th November, 2018
Mark M Subject: Electronic ignition (thorspark)
That is the only risk, a spit-back that ignites fuel. If you don't have a filter on you could try a bell-mouth with a gauze on it, these were used as flame traps back in the day.

REgards, Mark
Posted: 10:53pm 8th November, 2018

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