You didn't answer whether the servicing was done by the Dealer or if you did it as it would help to know the facts as Yamaha would have no obligation if either you did the servicing and used who knows what oil and filter or that your Dealer didn't use Yamaha products or didn't know what he was doing, in Australia we have what's called the ACCC and laws that Govern reasonable expectation of items we buy.
You may buy a new Fridge with 12 months warranty and it dies two years later the seller has to pick up the fridge and get it repaired or offer you a replacement.
AS long as the fridge is in normal condition for two years , if it looks like it's been carried about lying down with scratches and damage then of course it's not normal use and you will have trouble.
Items that we all buy have an amount of time most people expect said item to last, buy a cheap $25 Battery drill with 12 months warranty and everyone would be happy if it lasted past it's warranty, buy a $600 Battery drill and if it lasted only 18 months then you wouldn't be happy and would have expected it to last at least 5 plus years and nearly forever if it was just home use.
I would find out from Dealer if he used Yamaha products as he seems to be trying to sweep you under the carpet and should be pushing the issue if he did everything legit.
Otherwise if you did it yourself and didn't do things correctly then of course you can't expect compensation.
You can if the Dealer didn't do things correctly Sue him for the cost of repair or part thereof, it may cost you a few dollars but if you see a Lawyer first to see what the laws are in your State it may be worth it.