I am guessing that is not a injected engine next time you ride, before you shut it down shut the fuel off and let it run minute. That will tell you if you have a needle and seat problem and fuel is flooding out the cyclinders after it is shut down.
Could be bad rings. Sled was known for this. Check compression to see, or remove exhaust and look at rings for flaking. Try giving it about 1/4 throttle when trying to start when warm.