My bike has been running perfect since I got it and made the free mods and jetted it a year and a half ago. Last week I was riding and it acted like it was out of gas by giving a short stall. I was close to a gas station so I pulled in and saw it had plenty of fuel. I rode back home without any other issues...without adding fuel. Yesterday I was riding a DS and 75 miles into it, it happened again, I thought I was out of fuel but was not. It seemed to stall for a few seconds and then it cleared up. My Valves have not been adjusted yet, but I don't think this is the issue. Any ideas??