SV650 Bj 2001 no longer starts

Hello dear motorcyclists! My motorcycle was now almost 3 months out in the cold and in the rain, because unfortunately I have no garage. When I wanted to start it before the long break, it only started on a cylinder, because the front spark plug had got too much water. Last week I then (hopefully) successfully dry the spark plug. Unfortunately I lack the tool to get it out completely. I then built it in, tried to start and the engine actually ran for a few seconds before he went out again. After that I tried it again directly, but then the bike only cared for it. The engine didn’t work, but only cared for it. I then fully charged the battery, reinstalled it – again only on the organ. I read that it might be due to the carburetor, that it has become empty due to the long service life in the cold. I can’t imagine that it is due to the spark plug, since it still works last week I could call the ADAC, but this time I wanted to solve the problem alone (as best as possible, of course ). Maybe one of you will know what to do? How do I solve the carburetor problem, if it is at all? If I have to do this, I’m not sure how to solve the problem.