http://www.motocrosscenter.com/shop/en/piston-rod-crankshaft-bearings/20208-complete-crankshaft-gas-gas-ec-125-01-08-me120112000.html
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Try to change the brushes in the starter motor. It is same as Honda Hornet 600, I have the part numbers if you want
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Check the charging coil, heat it up and see if it has affect on the resistance. My bike started to misbehave when one of the wire broke loose from the center of the coil.
EC 250 2001, FSE 450 2004
Oil hight comes in to play at the end of the stroke, more oil leaves less air to be compressed. But it has litle affect in the beginning of the stroke
EC 250 2001, FSE 450 2004