Troy-Bilt TB32EC Weed wacker not starting

[Amituofo]

Hi Expert,
My Troy-Bilt TB32EC Weed Wacker won't start. The whole carburetor assembly works on another weed wacker. I also replaced the spark plug.

This trimmer has been making squeaky sounds when it was working.

What should I check next?

Appreciate any help you can provide.

 

[ILENGINE]

Did you check for spark with a known good plug. After that then it maybe time to borrow a compression gauge and check compression. Below 90 toss in the trash.

 

[Amituofo]

The spark plug works in another trimmer. I presume it's good.

I think it's something to do with the engine...