I have a craftsman push mower with a 6.5hp B+S that is 3 years old that doesn't run. It all started when I hit a large rock and bent the blade last summer. When the blade started hitting the ground I turned it off and tipped it on it's side to check the damage. After I replaced the blade I mowed a couple more times with it then it wouldn't run anymore. While trouble shooting I took out the air filter and what looked like oil and gas mixed together (thick like oil but yellowish) started leaking out. It hasn't run ever since and I have no idea what the problem might be or if it's related to hittng the rock or not. Any ideas of what it might be or if it's fixable?