Could be the "permanently lubricated" needle bearing in the generator head has seized and spun. When it fails it lets the armature rub on the field poles causing drag/sparking.
To inspect, remove the thru bolts holding the generator head together then carefully pull off the end bell (watch for the pair brushes that will pop free as the end bell comes off). The bearing is pressed into the plastic end bell. Unfortunately when it fails it usually destroys the end bell.
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Today's Featured Article - The Rescue of a Fordson F - by Anthony West. Introduction I live in the UK and have for many years restored Fordson tractors (in the main model N's). I have also restored and shown model F's, E 27N's, Field Marshall Series 2, David Brown Cropmasters and the old rey Fergeson T 20. At one time I had seven restored examples which were shown and used in ploughing matches. As most restorers, I have a number of war stories I can relate on a range of topics that may help other like minded and interested people. Perhaps my first p
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