How to make motorcycle electronic ignition for £5 ($8) from a chainsaw or strimmer

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I thought I would share how I made a magneto ignition for an old 1940's WW2 motorbike from a chainsaw. It will only work on a two stroke of course and you can't advance or retard the ignition when riding. It does however work pretty well and will get you back on the road rather than just look at your bike. I know purists will moan but oh well. Keep on moaning and walking.