What is this part called and what’s it do? Engine won’t star

Mr. Sachs Sachs /
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Hi everyone,

You know the story, it was working great, then a friend borrows it and returns it not working.

I’ve replaced all of the following parts below and it doesn’t turn over. It has good compression and spark.

Cleaned tank

New gas

Pepcock replaced

Gas line

Gas filter

Rebuilt carb/cleaned carb

Carb starter spray technique tried

Tried to kick it over multiple times down a long steep hill.

1st Picture - This part is rusted and doesn’t work how it use to. It’s some interesting spring that disengages a rod from inside the engine, pretty sure it’s the choke and lets more air into engine when starting. I’m assuming I should replace it but where do I find the part? Thanks for any help

Second and Third picture - Know where I can get this part? Is it the solenoid or coil??? brand Boch

3) how hard it is to un-seize or redo a post one in a moped?

Thanks and any help or advice!

Mr Sachs

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