i have an arctic cat 500 manual a 2000yr model, oil coming out ofcarb while running ,it happened to me 1 time took it to shop and said carb needed cleaning(they cleaned it and has new gas). lasted two weeks and a total of running it three times for maybe 20 min each, back to same problem. i took carb off cleaned it best i could put it back on still doing it. the motor has 600 hrs on it. any suggestions?? please help