Am I correct in assuming that by saying "she wants to go but then decieds not to" you mean that you crank it and you hear some cylinders firing occasionally but the bike won't start. I think that's typical behavior for when you're not getting any/enough fuel. For example I'm getting it when I run out of fuel. When refuelling the carbs are empty and the fuel pump is wired so as to only provide fuel when the engine is turning over so you have to turn it over a bit before the carb bowls fill up and the engine can start. In the mean time the engine is running lean (as the level in the bowls is not high enough to provide adequate fuel) and it sputters like this.
The problem is that you haven't run out of fuel. The fact that the bike has been sitting for a few weeks though suggests that the jets inside the carbs have gummed up and can't provide enough fuel to start. If that is the case I don't know what to suggest other than taking the carbs apart for inspection and cleaning. Have you tried starting her with some throttle? How much depends so you need to fiddle with it slowly when cranking to see if it makes any difference. The thing is that your carbs have three seperate circuits through which they draw fuel, each with its own jet (a small hole, through which gasoline fumes are drawn) and if only the idling circuit jet is clogged say, you may be able to start her up by drawing fuel from the pilot or main jet. You "select" circuits with the throttle so it might be worth a try.
You should check your fuel pump as well. You can feel it by sticking your hand under your fuel tank from the right side but you need to know where it is. If it vibrates it's working, if not then it's either dead or your carbs are full so it doesn't need to pump fuel. That's an easy check but it probably won't tell you much. The other obvious way to test it is to disconnect the fuel line from the carbs and crank the bike to see if any (and how much) fuel comes out of it. You should be ready to catch it in some container of course as it might be quite a bit.
Sorry about the lengthy reply but I have a thing against unjustified advice. Hope you get her started. Even if you do though cleaning the carbs would probably be a good idea.
