I have an Echo trimmer model SRM210 and it will only run after it has been choked. It will run for a few seconds at high speed and then die. Thiings I have tried after reading a similar post on this forum: 1. Cleaned the carb 2. Removed the exhaust and checked for blockage 3. Got a new fuel line kit I don't see any high or low speed adjustment on this carb. Any suggestions? Thanks

I have a Mantis tiller - only 4 years old. This spring it would only run by operating the choke repeatedly. Then quit altogether. Seemed obvious that it was a carburetor problem. Replaced fuel filter and installed carb kit with no results. Took it apart again and sprayed carb cleaner into all holes to discover there seemed to be a blockage that I traced to the "high" and "low" screws. In trying to remove these I wrecked the white "stop" cap. I searched online to find specs for how to install these again and thought I'd found the answer, but no success. So, I started experimenting and now have it idling perfectly. However, it now stalls as soon as load is applied. Any suggestions? Would it be the settings for these screws? or might I have some other problem?