To wash it out I remove both needles and the diaphram side of the carb. Then I squirt fuel through the fuel intake and push down on the fuel inlet valve to let fuel through. Then squirt fuel in both jet seat holes. This usually cleans things out. Then I reset the needles to 1&1/2 turns out. Long ago I removed the internal screen.
The best filter I am told is the filter clunk you get from the chain saw shop for use in weed eaters. This requires a three line system to your tank. Brillelli has a 100 micron stainless steel that can be use in the fuel line. I use both. They are cheap.
If it still won't take the throttle try opening the LOW speed jet 1/8 turn.