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Mine wasn't gas cap - as mentioned it's not a vented cap design, pulls air through a hose that's filtered from air filter. I think I have finally fixed the issue. @bertsmobile1 had suggested it was fuel related early on. I ended up replacing the screw in shut-off valve and the problems...

I'm positive it's not the plugged tank. The rather large air line is clean ... and even when you take the gas cap off it doesn't make any difference in how it runs. An external tank doesn't seem to fix the problem either. I need to run it some more to be sure, but I replaced the valve cover...

I adjusted the governor (though I think it was already tightened as much as it would go per the video) and I also replaced the intake seals on the manifold (someone mentioned that was a common source of vacuum leak). Neither really made any difference unfortunately. It ran for ~25 min and...

It's a good callout, but this one doesn't have a vent cap. It's a commercial model that has a separate vent tube which is ultimately connected through the air filter - so it only pulls in clean air.

I have not gotten it fixed yet. I just set the governor... although per the video above it was already tightened and I don't expect any change. I also searched around for common vacuum leaks and replaced the two gaskets at the intake manifold to engine. When I removed them originally they...

Not much to adjust; however given it runs fine for about 30 minutes and warmup should happen well before that, I think something else is going on. Adjustment in the manual just talks about bending the arm a little one way or the other if necessary.

I know this has a metal 90 degree elbow with a shutoff valve. I cleaned out the tank as thoroughly as possible while troubleshooting everything last time, and also used a small pipe cleaner (the kind kids use in school projects) around that elbow. At this point willing to try about anything...

So I thought I had this sorted out. But I fired up the mower again today and while it lasted longer (ran about 30 min) it then started to hunt and stall. Video of problem I've replaced pretty much everything. After it stalls, choke it, will start right back up again. B&S VTwin's 22...

Well, I finally got the external tank (it was about 3 days late). Decided to replace the fuel line as well and try it with the new tank. Ran fine for about 20 minutes (had to fill the small tank twice. So I blew out the old tank with an air hose real good, stuck an inspection camera down...

It's a commercial mower, so just using regular unleaded that's supposed to cap out at 10% ethanol; however I did hear that during some of the gas price/shortage issues there was a waiver to allow 15% for awhile... so certainly possible that may have some something. I always use Stabil in...

Choking it (either via choke or changing carb inlet) will make a minor difference for just a couple seconds but it'll hunt and stall either way. It's hunting so much that it's hard to tell if it's making it better or worse for the short duration. When I had the intake manifold off (mine is...

The issue started with the original Nikki carb. It wasn't really excessively dirty but I decided to clean and rebuild it anyway. Also bought a Kohler replacement. Both behave the same way. Pretty sure the carb isn't the problem as the issue exists in both exactly the same. Air filter...

I ordered a small tank to try it out. Be a few days before I can report back on that one, but fortunately at 6 min don't have to wait too long once I get the tank. I can rule out the small children factor though, haven't had those in awhile. :) If that is it I'll have to figure out how to...

Brand new carb - bowl is clean.

I can certainly give that a shot. Given the tank is completely sealed and the vent is through the filtered air I have no idea how anything would have built up. I also did drain the gas tank and nothing came out except gas.

Normally pretty good with mechanics, I've got one that's totally stumped me. My Briggs & Stratton VTwin 22HP will run for about 6-7 minutes, then the governor starts hunting and it eventually dies, even under no load. What's odd is that if you choke it, it'll start right back up (hunting...