As topic states, I began my spring clean up today. I put fresh gas and oil mixture in the tank w a new plug as well and it fired right up. I had it running perfectly fine for about a half hour and I made my way towards the pine trees and was trying to bag up all of the left over pine needles (what I couldn't rake up) and when I was done it began to make a whining noise and started to bog down. The noise almost sounded like a belt or bad pulley. I took the mowed in the garage and sprayed the pulleys down w some wd40 thinkin it was the needles that got something clogged up. It started back up and I ran it for about 10 minutes and at that point it started making the same noise. Any ideas?