I’m hopeful someone can give me some direction in giving me an idea on what to do to fix this engine. This is a Snapper rear engine 281123BVE, that I bought used with a bad motor. I found a company that sold me this motor and it is a real problem. I bought it in October, one year ago. I installed it and it fired right up, but I couldn’t get the rpm’s much over an idle. I spoke with the companies technician 4 or 5 times with no change. They told me I had to take it to a Briggs & Stratton authorized repair facility. So, one year later I finally get it back and the rpm is no different and now it runs extremely rough when cold. The repair facility spoke multiple times with either them or Briggs and this is what I have. The repair guy said they never should’ve sold me this motor to be used as a lawnmower even though they told it would work. The only way I can see to adjust rpm is with the governor and that is real touchy. As I said it’s a Briggs, model 31R577 0027 B1. if there anyone familiar with this engine or able to give me some ideas, I would really appreciate it.