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I have read that this is a common thing when the "swing head arm" is not set up correct with two screws and could bend when force act on the shaft.
Well! Monday reamed the bearings. I notice that bearings where not proper aligned. Could only reamed them from both sides and try to guide the reamer with a taper bush pressed in other side.To get the shaft freely spinning it need some more (looser) work. I have read that this is a common thing when the "swing head arm" is not set up correct with two screws and could bend when force act on the shaft.But! Yesterday turn a bush for my Kawa Z1 to fit original exhausts. I did not tighten the engine belt too tightly. Immediately noticed fewer vibrations in the swing arm and headstock! And after making the bush no warm area around the bushes!Only looking for a oil feed gun.
Well, I have read about twisted casting before started on this replacement. Other option was to get a second hand casting, but there you also not very sure if also has not the twist. For now it is wat better then before, so little vibrations. And with VFD controlled way more fun and earlier to work on the machine.New shaft between 19.14 - 19.17 mm.After reaming pulley side 19.20 other side 19.30 mm. 0.06 - 0.13mm play