The steering heads and front ends are fully assembled by Kawi. They don't touch that, on the 300 I think they need to bolt on one handlebar. The bikes are full of fluids except fuel, they test them on a dyno at the end of assembly line.
Old, worn tires that have cupped can also cause the decel wobble. That is why new ones solve some of these complaints.
Some bikes have it brand new, some tires bring it out on others, Triumphs and V-stroms seem to commonly get wobbles from certain tires. Contis in particular and that is the brand I have on the 300 now. That was why I swapped the original 400 mile old IRC back on.
I'll see if I can find the time to get a wheel balancer set up just to rule it out completely.
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