Had the darn bike running really nice. Started right up, idle nice at 1100, and accelerate well. Now, it runs okay but it won't idle. The rpms go lower and lower until it finally dies. It's like it's running out of gas, and yes, I checked the fuel level and the petcock. I took the screen out fo the petcock and it was clean and the bowl was full. I put a spark plug tester on and both sides are getting spark.