Warranty,,, accept that it's purpose in life to absolve the dealer from their obligations under the Sales of Goods Act. They can do what they like, and ask what they like from a legal standpoint.

You do have legal rights under the Sales of Goods Act, and this is the supplying dealers responsibility (not yamaha).

Unfortunately, this case you have to go back to the supplying dealer, it is 'reasonable' to give them the opportunity to correct the problem (in regard to the law), so yes, you have to go to them if they ask. However, Warranty is provided by Yamaha, so you can in theory use any Yamaha dealer

The dealers comment regarding seeing the bike, although there is no obligation to use a main dealer, or the supplying dealer. They have a point, arguable yes, but as they haven't seen the bike then it's very difficult to disprove (if they had seen the bike, and done nothing then that would be different).

I would try a local Yamaha dealer, providing the service is in accordance with Yamaha's instruction, then they should honour the work.

Alternatively, bite the bullet and order a set of stainless spokes and pay to have someone fit them - because if you live by the sea the new ones are going to go the same way...

__________________
>-------<

Never underestimate the power of stupid people in large groups.