OT: two stroke engine on rototiller

If you do not mind, I would like to ask for help with a small two stroke engine that drives
the tines on my Mantis tiller. I am frustrated
because I cannot get it to run with any power.
I cleaned up the plug, regapped it and put back
in place. I then emptied all of the old gas out
and refilled with new gas and oil (50:1). I then
adjusted the carb, following the manual instructions. I can get it running and it idles
well. When running I sprayed carb cleaner in the
carb to clean it up. The problem is that the adjusting screws on the carb seem to do nothing
when they are adjusted. When I go to throttle
the engine it has no power. I cannot get a smooth transition to full throttle without hesitation, then stalling. What would you guys
do? I am about to tear apart the carb and
see about cleaning it up. It seems like all of the small engines I have ever had only run
well for a couple of years (except chainsaw engines, which seem to run and run) then go south.

Thanks for any tips.

Tim, Ohio

The Echo motors had a gas cap vent arrangement that didn't do well with todays gas and can become glued shut.

You might check, or change the fuel filter in the tank.