I recently bought a used toro mower and it works great, but I am wondering what could cause it to have to pull between 7 to 10 times before it will start. It really gets my arm sore after pulling so many times. I'm a chick so I don't know alot about mowers. Any help will be much appreciated. I have it in neutral and I have the other lever on clutch just like i am supposed to. On my previous mower I could pump the gas button before I started it but this one doesn't have one. Also when it does start, it revs up and down for about 20 sec and then it is fine.