Or it could be.... My 04 WR25F had very low miles, but sat for quite a while. When I began to ride more, I noticed that the overflow was always draining. I assumed it was the float and cleaned it out. Twice! Took it to the shop. Expensive adjustments. One ride, and here came the gas again. What I traced it to was the gas valve on the tank. The rubber was deteriorating over time and small chunks of rubber were sticking in the carb.. It is easy to check/fix. Good Luck.