I have a flooding problem with my engine. If the sled sits for a while without turning off the gas, the crankcase gets quite a bit of gas in it.
One of two things is happening. We had a similar problem on one of our sleds this year. A foreign particle hung up in the needle and seat in the float bowl causing the floats to stick. Gas was running into the carb and engine all the time. The solution was to pull the float bowl off the bottom of the carb, remove the floats and inlet needle. There above the needle we found a chunk of material that had caused the problem. We are to the point that before every season we are going to remove and clean the carbs on our sleds. Too many cases of “carb related problems” are showing up and this is cheap insurance. The other possibility is that the needle and seat have a poor seal and are slowly allowing the fuel to pass. Pull the carb on the offending cylinder and have it pressure tested (most servicing dealers should have a pressure tester).