Hi and welcome to fixya,
Nice bike. The problem with flappy or loose shifters can be caused by worn out shifter linkages. These are ball joints connected to a rod which enable play forward or backward. You mentioned an excessive play, I suggest you replace these shift linkages, make the necessary adjustments and you'll be surprised how responsive your shifter will be.
I highly suggest you check on this part first before proceeding with transmission problems.
Other related concerns relating to poor shifting:
-Clutch release
-clutch spring adjustment (center of the clutch cage)
I hope this helps
levibit
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