Hey Belbowski,
Has it been sitting for a while?? Sounds like it could be several things..
1. The needle and seat in the carb may be dirty/clogged/sticking and not allowing a full flow of fuel into the float bowl.. when the bowl fills, it will run fine for about 20 - 45 seconds then "run out of gas.. it will restart and repeat this over and over.
2. The petcock/fuel tank may be stopped up/clogged/blocked and not allowing a full flow of fuel to the carb... causing the same symptoms as #1.
3. ..maybe..you may have a vacuum leak causing the fuel pump to not pump enough fuel to the carb. = Symptoms #1
4. Fuel pump might be bad. = Symptoms #1
Once you eliminate these items... repost with results.
SOURCE: 1992 kawasaki Vulcan 750 stops running
Sounds like what you realy need to do is remove the carb jets and give them a good clean , this if I am right is the twin V 8 valve engine with twin Klhein carbs , make sure also your air filter is not dirty and check tank fuel filter ,, other than that you may be intrested in the manuel obtainable from this site
http://www.haynes.com/products/sfID1/8/sfID2/9/sfID3/81/productID/399
hope this helps good luck .. and Live long and prosper lol .. Regards Vortash
SOURCE: 1992 kawasaki Vulcan 750 stops running
Check the intake manifold/s, even a small leak will make it run poor. Being stored for five years then putting it into use, you may have a blocked main jet. Sea-foam is a great product and I would have used that product to store the bike but not to get it running. It is slow acting so it doesnt work like carb cleaner.
SOURCE: 2006 kawasaki 750 vulcan will not idle , will idle with choke
ok buddy on the carb will be some sort of screw and idle screw turn this in 1/4 of a turn with the machine running until it idles at 1000rpm also the choke will stall the engine when warm the choke is only for cold starts get back to me more info or problems 
SOURCE: electric start cliking, lights flicker when running
if you have a volt meter, check the battery cables for voltage when its running. if you read above 12 volts, then your charging system is fine - replace the battery. if less than 12 volts, then you have a bad stator winding and will need to have the charging portion of the stator replaced. probably about a $300 part.
SOURCE: i have a kawasaki 750 brute force that cranks and
you need to reset the computer its under your seat there are 2 plugs by your fuse panal just unplug them and plug them togather turn key on wait 7 seconds them plug them back up right
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