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Is there any way to test out the primer bulb? I've pulled it out of the air box and there are no cracks or anything. No back pressure when using it, although there doesn't seem to be a lot of air flowing through.

All right, thanks. I guess that makes sense. I assume then that the primer bulb is the only thing that has an affect on fuel/air mixture at startup with this carb?

Thanks again Scrubcadet10. I'm not clear on how you can eliminate the governor from the problem since the motor fires up on the first pull when the carb intake is blocked off with a rag, or a shot of starter fluid is used, or the engine is warm. I appreciate your help.

So I doubled up the gaskets twixt the carb and the airbox to no avail. My gut tells me a new airbox isn't going to fix this. Anyone know of an aftermarket carb that comes with a manual choke for this, or any other possible ways to eliminate the governor from the equation?

See my other post w/model & engine info: https://www.lawnmowerforum.com/threads/early-style-auto-choke-for-b-s-190cc-engine.64874/post-398539 I cleaned everything up, including the air box and primer bulb, but still no joy. I think I may get a new air box base / primer. There seemed to be very...

I cleaned it up, primed the bejeebers out of it and it didn't give a hint of it wanting to fire after 10-15 pulls. Pulled the air filter off and hit it with one quick squirt of starter fluid and it started with one pull. Most aggravating. FWIW, the model number I found on behind the grass...

The only serial number I found is on a barcode on the mower housing, which I can't find any cross reference for on the web. Nothing is stamped into the engine; I checked multiple times. I'm guessing the previous owner must have removed it.

I have the airbox with primer and the air filter. I removed them to sort this out. I'll definitely test out the primer before reassembling everything. Thanks for the info!

Thanks for the clarification sir. I will clean out the various organics around the linkage and lube them up to see if that doesn't help the situation.

Wow, thanks for all the responses! As a newb to this forum I was hoping for 1 or 2 responses, especially on what I thought was a pretty obscure issue. In regards to some of your answers, my mower does have a primer bulb, which unfortunately seems to have little effect during cold starts...

I inherited a 2008 (according to the bar code) Toro Recycler 675 190cc walk behind mower. There is no model ID plate on it that I can find anywhere. Definitely nothing above the muffler. The butterfly valve in the carb is fully open, even when cold. This engine does not have a thermostat / arm...