there was a comment in your new member thread about premium gas
these bikes are tuned to run on the fuel octane listed in your owners manual (you can down load them free from yamaha if you dont have one for your bike).
On carbed bikes the jets are sized for the fuel octane called out. On your fuel injected bike the fuel/air ratio is mapped the same way. Unlike a car with a full closed loop O2 sensor feedback long term adjustment, the fuel injection on these bikes does not self adjust when you change octane rating, or change the exhaust, or put a bigger air filter on for more air.
I know it sounds backward but regular octane fuel has more energy per ounce than hi octane. If you put premium in a bike that is set up for regular, it will run lean - with the highest grade premium it will run very lean, stumble, sputter.
It sounds like what your bike is doing is more severe than that, so it might be more than just the premium gas. Checking your plugs like Les suggested is a good start, esp if you dont know the last time they were changed.
Also take a look at your air filter - it should be white like paper, not grey, not tan... If your air filter is dirty it would throw the air/fuel mixture the other way, acting like the engine is choked and it will run rich - but most noticable when the throttle is wide open. Your bike seems to be doing the opposite - idling rough but ok with a lot of throttle twist. So the odds are worn plugs or premium fuel.
If you want to check the fuel, pull the line off the petcock and drain it out into a gas can, put that in your car, and fill the bike with regular octane.
Last edited by KCW; 08-03-2019 at 04:18 PM.