How to adjust carburetor of echo SRM 3021 test

I found any materials on web about echo 2520 but about 3021 has less. So, I'm try to compile all that I founded about how you can make a adjustment in the carburetor of echo SRM 3021tes.

In the first step, you need know what the screw is the adjustment. Because is not easy to find.

Second step, do need a special tool:

Other things that you can do to improve the performance of carburetor is a deep clean.

clean the inside

The valves of petrol and diafragma