The Russo-Japanese War instead becomes the American-Japanese War and unlike the Russian navy the American one is fully capable of sailing around the world to fight a war. A few years early and against a better opponent I think Japan will lose. Also should WWII not be butterflied away it will remove a lot of the mistaken notions that Japan and the US had about each other's military and industrial capability in OTL.
Er, where is the US navy going to be based, coaled and supplied? The British will presumably side with Japan as OTL. They don't even have a shitty deathtrap like Port Arthur to fall back on.
US is getting stomped in this scenario. No question.