UPDATE: Thanks to kind comments from helpful viewers, I was able to successfully diagnose and repair this blower. You can check out the successful repair here:    • ECHO Leaf Blower Won't Start...FIXED!...  
DISCLAIMER: I am unsuccessful at repairing this backpack blower. I am honest about that from the start. I hope my process will nonetheless be helpful to you, as we determine that there are internal engine issues that aren't worth fixing. I invite your comments and questions.
This is why I rarely spend time working on these inexpensive 2-stroke engines. And this engine failure is why I believe many consumers are opting for battery powered equipment. It's sad, really.
But thanks for watching.
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CHAPTERS:
0:00 Disclaimer
0:18 Intro
1:34 Start with Clean Fuel
3:13 Attempt to Start
4:34 Test for Compression
6:10 Test for Spark
8:25 Will it "pop" on starting fluid?
10:08 Muffler removed
11:29 A peek at the piston
13:28 That's it, I'm done.