I purchased a Toro lawn mower with a Tecumseh LEV 120 engine. The previous owner stated it wouldn't start due to a sticky valve. Upon further inspection I discovered a broken camshaft. I replaced the camshaft and re-assembled the engine and mower, cleaned the carburetor, added oil and everything seems fine. When I prime it as directed in the manual, it starts and then quits. It will start by priming the mower, but it won't continue running. It seems to be a fuel issue, so the carburetor could be the issue. When I separated the engine case, I watched closely as I could how things were installed internally. I wasn't 100% sure about the internal governor. I didn't see any timing mark on the gear like the camshaft and crankshaft timing marks. I made sure it was in the same location and the gear meshed with the camshaft gear. It didn't appear to have any type of internal adjustment. It looks like it has a couple of advancing weights for the throttle. Is there an adjustment? Would this be a possible cause to my issue? Is the problem carburetor related or governor related? I hope I was detailed enough in the description of my starting problem.

 

Do you still have the bolts out that hold the air cleaner box on? If so, put them in or it will behave this way. Otherwise, clean the holes in the carb bowl screw.

 

Cheese, Thanks for the quick reply. I have the mower assembled fully. I used some carburetor cleaner on the float nut, but will soak it a while and try it again. I'll post back with the results. Here is a picture of the carburetor and air cleaner for reference.
EDIT: While I had the float bowl off, I gave the underside of the carburetor around the float and near the needle and seat, a good blast with the carburetor cleaner. I hope this didn't cause the needle to stick to the seat?

 

Maybe this will help.

Disassembly of Tecumseh Carb 640017

 

Ok, remove the bowl screw and look for 4 tiny holes. The smallest one near the end is the one that usually gives trouble. Clear this one out. If this doesn't work, use a pick or safety pin and pluck out the plastic cover at the 8:00 position of the primer bulb over the float bowl. Then unscrew the jet from here and open the tiny hole in the end of it too.

 

Ok finally, I got it to start using your recommendations. I actually ended up using a bowl screw from another mower. I went to the website as posted by Airman (thanks) and was able to see what the screw should look like. Like cheese posted, the small hole near the end is the problem. I can't even see the hole in the screw from my mower, because it's so plugged up. The number on the screw I used from another mower is different from the screw removed from my mower, so I'm going to work on getting the original screw cleaned up and reinstall it. cheese and Airman, Your advice has been spot on. I really appreciate the time you took to solve the issue I was having with the Toro. Thanks again to both of you.