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Try taking the fuel jet out and blowing out the little hole that goes through it. Just a little bit of dirt will not let the engine run. While you got the jet out take the fuel bowl off and clean that as well. Be careful and don't mess up the float when you do this as sometimes they are hard to get back in. I find a lot of small engines I get in has a dirty fuel bowl and jet That's all i do in a lot of machines to get them running again..
Many times with a gas mix, after sitting for a while, the mix separates and gums up the carb. Taking the carb off and soaking it overnight in a parts or carb cleaner and running carb cleaner through the tank and gas lines will cure this.
Being springtime, I'm thinking you may have had your saw sitting all winter with last years gas in it. If so, you'll need to clean the carburator and spark plug real good, then put fresh gas in it. Always remember to run your saw out of gas before putting it away. Gas only stays fresh for a few weeks and will foul up your sparkplug as well as plug up the inside of your carb when it gets stale.
The Virago's have a tendency to clog up the carb. quickly due to sitting for a short amount of time, say a month or 2. Try and run some SEAFOAM in the carb. Remove the fuel line from the tank and force the seafoam into the carb with a turkey baster. Run the carb.s dry as best you can, force the seafoam into the carb. and let it sit for a day or so.Then try and start the bike off the seafoam, it will run and make a lot of smoke. Then hook the tank back up and see if that did the trick. Sometimes it will sometimes not, you may have to pull the carb.'s and clean them by removing the bowls and soaking them in a pan of the seafoam or something similar.
You say you cleaned the carb. If you did that by spraying cleaner in through the choke, that's good, but it doesn't get to the root of the problem. The problem is getting the gas into the carb. Try this. drain the gas. Put a small amount of carb cleaner and gas in the tank (about 1:1) Start it up, but don't run it dry. Let it sit for an hour. Then start it up and run the tank dry. Then try just a little gas to see if that fixed it. If not, repeat.
Good luck
Al K
Did you also drain the carbs when you drained the tank? You may have a vacuum controlled fuel valve which won't let the new gas into the carbs. If you can crank the motor long enough it should open and fill the carbs. Otherwise you can **** on the vacuum hose for half a minute and open the valve to fill the carbs that way. If it was sitting for a year or more it will likely need a carb cleaning, but it should run on new gas if it ran on old gas. Also if there is a fuel pump make sure it is working and any filter or screens in the tank fitting or inline that they are not blocked.
Sounds like there may be trash in the carb. when the gas bowl is full it runs until the gas runs out then it dies. Take the breather off get it started and then put you hand over the intake on the carb. sometimes this will allow the trash to be sucked on through do this several times take your hand off before the motor shuts down and then do it again until you clear it up. If this does not fix the problem you can take the bowl off the carb an see if it is getting fuel with the float hanging down this opens up the needle valve to let gas fill the bowl. there should be a steady stream of gas coming out. when the bowl fills up the float floats up and closes the needle valve. If there is not a steady stream of fuel coming out with the float hanging down with the bowl off you may have to remove the float and needle valve and clean out the needle valve jet with something like a sewing needle. If you are getting gas steady and fire to the plug it should run.
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