I don't have any fast answers - just a couple comments.
When you buy a new bike its supposed to come with an Owner's Manual and a warranty. Every manufacturer provides them for every bike - the retailer is supposed to give you yours.

Its YOUR LEGAL RIGHT to expect one and the dealers RESPONSIBILITY to provide one.

Its YOUY RESPONSIBILITY to read and follow whats in the Owners Manual.

If you do that and the bike fails to perform properly - its the DEALERS RESPONSIBILITY to fix things at no charge to you for the first year and its YOUR LEGAL RIGHT to expect that.

If you DON'T do that and there are repairs required, the dealer is still expected to provide an estimate and cannot make any repairs without your approval.