Engine starts but won't continue to run. Choke doesn't stay closed after starting. will stay running only if I hold choke closed manually.

Coleman engine starts runs short time quits Power ... - Fixya

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Coleman Powermate 6250 only runs with choke closed/air restricted ...starts and runswith full choke, but dies with choke off. ... some gas in the cilinder through the plug hole)and start the engine until it runs constantly. bestregards ... Ad ... I use a fuel stabilizer ... ...engine runs fine but produces no power at all to the breaker.

Coleman car starts but will not stay running Power ... - Fixya

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Question about Powermate Premium Plus 6250W Portable Generator ... squirt a little gas in the carb it will run until gas is gone doesnt seem to get gas from . ... ...starts and runs fine for about a minute, then dies as though starved for fuel. ... load up on fullchoke and stay running around 3/4 choke HI, Turn off the gas and take ...

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How to make Generac generator run bypassing the low oil sensor and ... Remove all; Disconnect .... My ...

Well your engine has a carb, so it could be dirt in the carb, or a vac leak, or several other possible causes.
Does the choke close when the engine is first started ? Have you checked the fuel line to see if the pump is providing gas ?

Well the choke has an electric part that heats up and makes the choke open in a few minutes. As soon as the engine starts the choke should open about 25 percent by way of a vac pull-off.
You can take the air cleaner off and watch the choke while someone starts the engine cold. If the choke does not open after it starts, check the choke pull-off. You can also open the choke with a screwdriver to see if the engine clears up.

Is the engine running at high idle or are you having to hold the throttle open to keep it running? If it stays at high idle on it's own be sure that when you push the choke back to the "off" position, check your linkages and be sure that the choke cam is returning to the low idle position, also be certain that your throttle grip operates without obstruction when returning to idle position. If you are having to hold the throttle open to keep the engine running you are probably going to find carburetor issues. Hope this help to get you looking in the right direction.

Normal starting practice is always done with the ignition on, primer as many times as it takes to 3/4 fill the bulb, move choke to full closed, crank engine until it fires once, move choke to half if there is a half position, crank engine until it starts and runs, move choke to full off.

main jet is clogged in carburetor. not getting any fuel.

Let it run with the choke for a while. There may be buildup in the cylinders that needs to be burnt out. In order to do that you need to let it get hot. Try very slowly opening the choke after its been running a while. Listen to the engine and if it sounds like its about to die, close the choke. You may also need to use starter fluid, it burns very hot and clean. You can pick it up at your local auto parts store. You may need to spray it into the carb the first few times to get it started.

You probably need a slight carburetor adjustment. Try to turn the L mixture screw (the one near the bottom of the carburetor on the air filter side, closest to the engine) 1/8 to 1/4 of a turn counterclockwise. These mixture adjustment screws ( L and H) have odd heads on them and conventional tools won't turn them. I use an automotive type plastic wire connector (around 22 gauge) with a ring terminal end which I can hold. Tap the plastic end of the wire terminal connector onto the head of the screw with a small hammer and this will enable you to adjust the L screw. This adjustment will increase you high speed side and possibly allow it to run off choke in a regular manner.

Make sure the governor linkage is clean and works freely. A lot of times when you put a load on the machine, use it it stopps the fluttering.

You have one of the infamous automatic choke Briggs carbs. These are supposed to close that butterfly that you describe, which is actually the choke until it is running, then it's supposed to keep it open. The problems is, if the diaphragm in the carburetor starts getting hard, or leaks, it'll kill the operation of the choke. They are known for their unreliablility to the point of where it's a shock to find one that actually works. You can fix it by replacing the diaphragm inside the carburetor, or by putting a spring on it that holds it open unless you manually choke it to start it.