[Diver]

Have a 96 Yamaha that had a stuck float valve. I changed the carburetor and it runs for about 30 to 45 seconds and then dirty gas starts to shoot out of the crankcase breather hose into the air filter box.

[Frank7]

Did you change the oil when you changed th carburetur? The crankcase may be
Loaded with gas from the old carb.

[Diver]

Haven't done it yet, but that is what I suspected. Could there be another problem to look for should changing the oil not solve the issue?

[Diver]

I will do that next. Would anything else be something to look for?

[Frank7]

I should solve the problem.