troy-bilt intek 18.5 briggs&stratton[31p777-0293] carburetor flooding

i have gas coming into the engine and into the oil i have drained and cleaned the gas tank took some of the carburetor apart and cleaned it. bowl float ,needle valve and several ports and rotated the flywheel to remove any gas in the head removed and cleaned all gas lines replaced gas filter with paper one put new bowl gasket on .drained oil replaced oil filter.started mower it smoked pretty bad. i assumed it was burning off any excess gas in the motor. parked it next day the gas that was still in the gas tank had drained into the motor and contaminated my oil.pulled spark plug and gas ran out of hole. when i took the needle valve and float apart everythaing looked fine. do i need to go ahead and replace float and needle valve? or is there somethaing else it could be .i never took the seat out, the needle valve has a black tip. could the seat be damaged?I sprayed everythaing generously with carburetor cleaner.again its a 18.5 briggs&stratton intek model#[31p777-0293]any help or videos with this particular problem would be helpful thank you.

 

at least change the needle.

 

Does this have a Nikki carb? If so, the float is probably attached to a white plastic insert in the carb. Look at the inlet where the needle goes on the backside of the white plastic insert. There is an o-ring there on most models. Usually when I have one of these carbs leaking gas into the oil, this o0ring is the culprit instead of the needle/float.

 

Check the fuel solenoid. Mine did the same thing on my Poulan. It started sticking in the open position and would fill the throttle body and breather and then spill over into the cylinder. Took it off and cleaned it (had started to gum up and a little trash was in it) and it works perfect now.

 

Just to keep others from getting confused, I will state that the fuel solenoid has nothing to do with this problem. Whether it works or not will not cause fuel to get into the oil.