Quipper I have to believe that Yamaha will warranty NA sleds if a rod goes they have never personally let me down warranty wise. Nor have I heard of anyone with blown /broke motor even modded or aftermarket turbos that was not warrantied even out of warranty period as long as they had a decent dealer to help them. However I cannot vouch for them without some mistrust since they have deceived the public in more than one way recently. So far the good of Yamaha still outweighs the bad. If I was in your shoes I would take the chance. For many of us modding our sleds is a large part of snowmobiling and worth the risk. You only live once!