I was mowing at dusk tonight and my mower ran out of gas and stalled. I switched tanks and it would not turn over. Found a blwn fuse. Changed it and it acted like a dead battery. I jumped it and it started. I noticed a metallic grinding sound and could see sparks coming from under the the engine going towards the deck. I shut it down and I cannot get it started again. Any ideas? All summer I have noticed a delay when I pull the switch and the blades engage, especially when I have been mowing all day with the bagger.