I was just able to get the old ytm 200 to run. I know your float is sticking or the valve is cause this ytm 200 did the same thing. It was pouring gas into the crank case and I went to check the timing by the timing hole and lit a lighter to see and it blew up in my face
. I just about sh!t myself and burned a little bit of hair on my face. I'd fix that carb if I were you cause if the gas is leaking as bad as this was then it can ignite below the piston rather than in the combustion chamber. Not a good thing to happen and should be fixed quick. Just take your carb apart and adjust the float so that it seats right.