Plodding along 2 days ago around 55mph knowing I was due to refuel. Shortly , 10 miles later , I switch to reserve fuel. The bike momentarily regains composer. Moments later the bike begins to sputter as if running out of fuel???. I made the gas station 5 or so miles later ; refuled , spun the fuel knob back to "on" no more sputtering?. Perhaps the reserve portion of the petcock needs cleaned . Any suggeztions. TIA.