If the bike is running well otherwise, I would say that there probably isn't much in the way of adjustment that will help. Lykos is really dead on with the suggestions.
the main tool you would need to do the work is an impact wrench, and an electric one can be had for cheap at harbor freight or similar store.
Is there a scooter shop anywhere close to you that could do the work if you can't do it yourself?
Smoak
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