Pour in a squirt of gas, like a soda bottle cap full in both sides. If you still have nothing, you cant possibly be getting a spark. If you get popping but no quick idle, then you need to look at the points and verify static timing. If it starts and theres an idle and responds to throttle before it dies, then the problem could be in the carbs.
A vacuum leak will cause problems yes. No matter what, if you are getting fuel and spark, you should eventually hear a pop or a backfire of some sort when you kick it over, even if the coil wires are reversed and timing is 180 degrees out.
Its totally a possibility that your battery has no juice.. These bikes need to have a battery to operate and it has to have good volts.
So I've done the gas in the spark plug hole test, on the second kick it ran for half a second or at least tried. I used less than a soda cup per cylinder, about 1ml per cylinder (half a cup) if it makes any difference.
I've checked on ebay and looks like there's a lot of cheap NOS breaker points, ill get a set.