Instruct: Classify Amazon reviews into positive or negative sentiment
Query: poor engineering design

I got one of the engines that is just hard to start. Once it is running, the trimmer works just fine but grass and dust quickly clog the air intake to the filter. Constantly having to clean the air intake and filter. Be sure and don't hit anything that you don't want damaged. When trying to start the engine one day I got too close to a post and it chewed it up bad.