There's definitely an issue with the starter-generator. I had the same issue when I was attempting to get my 107 to run. I tried to clean it, but nothing I could do would make it better. I ended up combining the outer piece of the original s/g with the inner core and ends of another one I had that spun the opposite direction. Works fine now, and even has better bearings. Maybe you can clean all the wear surfaces, replace the brushes, it may actually work better. My s/g did sit out for 30 years so I'm sure that didn't help it. Perhaps you'll be more lucky than I was with it.
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'70 107 with k301 engine swap
'71 106 with 38" deck
'70 147 R with factory replacement k321, 42" deck
'61 Original with 38" timed deck
'63 70 "pinkie"
1863 with 54" deck
'46 Farmall H, '50 Farmall Cub
105 x2 (parts)
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