Here is the deal > the manufacturer can not control the way a bike is maintained in daily use. If the wrong oil was used then the piston could seize up. That is not the dealers fault. The other problems could and should have been taken care of during the standard dealer warranty service checks but it sounds like you did not want to pay for the maintenance checks. That gave the dealer the chance to say it is not their fault. The problems other than the piston siezeing are generally minor items. I would have gone to a different dealer when the original dealer did not fix the problems the first time. It sounds like your best thing to do is to sell the bike or trade it in on another brand of motorcycle. Sorry for the problems you have been having. Honda and Yamaha are good brands.