I have a 2013 500. I just adjusted the valves and changed all fluids except the engine oil. I am currently at 110hrs. I just did this last week and this past weekend I took my bike out and I am having issues. After riding on trails all day and getting to about half tank the bike starts missing and acting like it is running on bad gas. It idles fine if this happens and slight throttle works okay but any more and it starts missing and back firing. I took it back to my camp site, let it cool, filled up the gas with fresh gas, and also extra tightened my battery terminals. Next day runs perfect until about half tank again when it barely makes it back to camp. I have no messages display on the dash so I dont know if its a heat issue or if its going into limp mode. Any ideas what might be wrong? Also if it is messing up I can shut it off and sit for a little and then restart it, it will run perfect for a couple seconds under full throttle then start messing up again. Today I took it out and ran fan as far as I know however I didnt get near half a tank.