Will the operating engine vacuum keep the choke open?

[juntjoo]

I have the wrong carb that requires a manual switch to operate the choke for my push mower vs the bubble pump action of the mower so I figure I can just rig a makeshift switch but I wonder if it can be one way choke-closed and let vacuum open it. Got me?

 

[Auto Doc's]

The choke is manually operated by linkage on most machines. The vacuum of the engine has nothing to do with it. Get the correct carburetor and quit trying to rig the wrong one. Gees!

 

[StarTech]

Toro 20065 - SN 280105976​

Briggs 124T02-0161-B1

Still unwilling to get the correct carburetor for that primer system I see.

 

[Craftsman Garage]

Toro 20065 - SN 280105976​

Briggs 124T02-0161-B1

Still unwilling to get the correct carburetor for that primer system I see.

It's not that hard

 

[FixItFrank]

Hey man, that's some creative thinking right there. I see what you're trying to do.
To answer your question, no, the engine vacuum won't open the choke for you. The choke plate is usually too heavy and isn't designed to be moved by air like that.
I've been down that road before, trying to make a wrong part fit on my old tiller. I think your idea of rigging a simple manual cable to the handle is probably your best bet if you want to make that carb work.
Honestly, sometimes it's just easier to get the right part in the first place and save the headache.
Good luck with the project, hope you get it running.

 

[StarTech]

And there the extra expense for parts for experimentation. That carburetor is meant to operate off a thermal control on the muffler which means a new muffler and linkages.

Getting the correct part is much easier besides if you haven't fueled that choke carburetor you always put it on eBay or Facebook marketplace for sale.