Also the carb might be getting gunked up from the fuel over time. You can try to clean it with carb spray or an ultrasonic cleaner. Also, maybe your low and high speed mixture screws need to be adjusted. If they have special "tamper resistant" screws you can buy a whole set of various adjustment tools off Amazon for very reasonable. Or you carb is just worn out internally and getting a knock off replacement for ~$20 from EBay or Amazon is the easiest way to go. I've done this multiple times with various 2 cycle equipment and it has been very successful and easy. Check on Youtube, they have lots of videos on this.