I have a 2014 Trailmaster 150XRS and it is solid. I also have a 2004 Hammerhead Twister, and they are very similar in construction. I like the idea the design has been around for a while. I am told the same company made both. The Twister still works like a champ.
I had same problem, replace the carb.
I had same problem with a 2014 Trailmaster buggy. The solution was to replace the carb. Also make sure your CDI is DC.