ok I got gas last night, I put it in and... no good. it turns over, fires for a split second, keeps turning and just repeat the process for few seconds then backfires and shoots smoke. maybe the timing is off. but then I checked the oil and it was over filled. not sure how because I had filled it a few weeks ago right in between the fill lines. so I drained it back to were its supposed to be and know it doesn't shoot smoke or fire for a second. im not sure what is causing this.