No gas in the float bowl of the carburetor. - 2007 Yamaha V Star Classic

Probably your Carburetor float seal is leaking inside. Have someone check your Carb.

If mower has been put up for winter and old gas left in gas tank it will drain to carburetor and the float will stick. This will let the gas flow out the float bowl. Remove float bowl and use carburetor cleaner to clean the valves and move the float up and down when it you get it clean the gas should flow float down and turn off when pushed up.
B. J.

Remove carb float bowl. Check float operation. Float down gas flow, float up no gas flow. Clean float bowl. Observe bowl screw, see if there is a hole or holes thru the screw. Clean out with thin wire, bread wrapper works peeled back about an inch. Use wire to clean out center port of carb. Remove mounting pin of float, remove float and meter needle, clean out port up thru carb with wire. Reassemble try to start. Prime at least 3 times, ensure primer bulb is not cracked, replace if cracked. Replace air filter if dirty. Replace spark plug once a year. Fill oil. 30w. Mowers now have a low oil cutoff.

If there is gas in the oil the float valve is being held open either by a worn float valve and seat or dirt in the fuel line and possibly a hole in the float. You will have to remove the carburetor from the machine and disassemble the carburetor. Remove the float bowl from the carburetor and check for dirt in the bowl. Remove the float pin the remove the float and float valve. Inspect the float valve for wear it should be smooth all around the tip. Shake the float to see if there is fuel inside the float if so replace the float. with the fuel line off of the carburetor allow some fuel to flow into a clean container and allow any dirt in the fuel to escape.

Don't run it that way! Drain the oil....all of it. You have a flooding carburetor. Most likely a stuck float needle. Drain the gas out of it too for now. Unscrew the Bowl on the bottom of the carburetor AFTER you drain the gas. At the front of the bowl is a clip attatched to a small metal needle valve.Let the float hang down and spray with quick bursts some carburetor/choke aerosol spray cleaner upwards where the little clip holds the needle on. This may dislodge whatever, dirt or crud is not allowing the needle to seat all the way, once the bowl fills up with gas. It works JUST like the water fill valve in the tank of your toilet. Clean out the bowl of any water and debris. Clean the bolt that holds the float bowl on the carburetor. Do NOT scrape it with any metal objects.
If you don't want to work on the carb this way, then remove it, disassemble it and clean it well with carburetor cleaner. Depending upon the age of the machine, you may need to install a rebuild kit.

Most of the starts but dies problems are caused by dirt/water/debris in the carburetor float bowl.

You can try draining the gas out of the carburetor float bowl by removing the float bowl nut located on the bottom of the carburetor.

Make sure the hole in the float bowl nut are clean. If the problem persists after draining the float bowl nut you will have to remove, dis-assemble and clean the carb with compressed air and carb cleaner.

Most of the starts but dies problems are caused by dirt/water/debris in the carburetor float bowl.

You can try draining the gas out of the carburetor float bowl by removing the float bowl nut located on the bottom of the carburetor.

Make sure the hole in the float bowl nut are clean. If the problem persists after draining the float bowl nut you will have to remove, dis-assemble and clean the carb with compressed air and carb cleaner.

the engine is not getting enough gas. when you hold down the primer you are bypassing this problem. to fix this simply adjust the carb's fuel screw, located on the side of carb, a little at a time until runs smoothly.

Carburetors have a Float Bowl on the bottom. This float bowl has a small amount of fuel, that the carburetor uses. (The float bowl's amount of fuel, is replenished from the gas tank. The fuel is gravity fed from the gas tank, through the Fuel Line)

The float bowl has a Float Needle inside. The float needle is attached to the Float. The Float resembles a thick doughnut. On one end of this doughnut, is a flat piece of metal shaped like a U on the end. Looking at this -> U shape, there are two holes at the top. There is a metal pin that goes through these holes, and the pin is attached on it's end's, by the main body of the carburetor.

The flat metal U shape, and the metal pin, works together to form a type of hinge, allowing the float to pivot on it.
Where the U shaped hinge is attached, the float needle, clips to it.

The float needle has a tapered neoprene tip, and sits in a Float Needle Seat. This seat is a barrel shaped piece of brass, and has a tapered hole at the bottom. Fuel comes up through this seat, and the float needle regulates how much fuel can come in.

As the float drops down, it draws the float needle out of the float needle seat, and fuel comes in. As the float bowl fills with fuel, the float rises, and pushes the float back up, also pushing the float needle back into the float needle seat, cutting off the flow of fuel.

There is a specified height of the float, in relation to where the float sits in the float bowl. If the float sits too high, the float bowl fills up with fuel, and overflows. This overflow goes through an Overflow Tube, on the carburetor.
(If the float sits too low, the engine starves for gas)

A LOT of times, crud builds up in the gas tank, makes it's way through the fuel line, and gets into the float bowl. It can get in-between the float needle, and the float seat, thereby flooding the carburetor out, and fuel comes out of the overflow tube.

The float bowl is also attached to the carburetor with a brass main jet nut. At the bottom of the float bowl, this will look like a brass head of a bolt. Under the brass head is a small O-ring. This can leak. First step is too insure this is tight. (Do Not Over tighten! This is part of the main jet, and is expensive! It's Brass)

Where the outer part of the float bowl itself, attaches to the carburetor, there is another O-ring.
A large one. This O-ring, like the main jet O-ring, can deteriorate over time. Additives that gasoline has in it, heat from the engine, and heat from the sun does this. Plus just age. Neoprene breaks down after time.

It could also be that the neoprene tip of the float needle has broken down.

You indicated you adjusted screws on the bottom.
These are the Main Jet, and Idle Jet -> Air Mixture screws. All they adjust is how much air goes through these jets.
The amount of fuel going through, is predetermined by specific passageways, that are drilled through the main body of the carburetor.

This only comes into play when the engine is running. With the engine off, and fuel leaking out, you have crud under the float needle, or one or more of those O-rings has deteriorated.