What can cause oil and gas spew from the carburetor the carburetor .Yard Machine garden tractor with walbro carb on 14.5 Briggs and Stratton

Normally, you just go by the Briggs and Stratton engine and model numbers. B&G carbs

https://www.google.com/search?q=replacement+carburetor+for+a+18.5+brigs+and+Stratton

Or Walbro

https://www.banggood.com/buy/briggs-stratton-carburetor-walbro-697202.html

I would be surprised if Jack didn't have one!

Briggs and Stratton 31E707-0111-E1 Parts Diagram for ...

https://www.jackssmallengines.com > briggs-stratton > c...

Briggs and Stratton 31E707-0111-E1 Carburetor - Walbro &Nikki, Cylinder Head, Fuel Supply, Kit - Carburetor Overhaul - Walbro & Nikki Exploded View parts lookup by model. Complete ... (Carburetor Part Numbers 696179, 697202). $6.18.

https://www.google.com/search?q=Walbro+697202

..

Here's a replacement on eBay. $55


Carburetor Carb Engine Motor Parts For Briggs Stratton Walbro LMT 5 4993...

check for gas in yuor oil if does replace needle and seat in carb then chang oil filter if it has one make sure to clean bowl well on carb let me know what happen

You need to determine if you have a Nikki or Walbro carb. The Nikki bowl is held on by two phillips head screws and the Walbro bowl is secured by either a single bowl nut or a anti-backfire soleniod (two wires going to it). Your problem is probably the seat in the carburetor. We see very few float problems since most of them are plastic.

If you have a Walbro with the anti-backfire solenoid you will need to get a slim 1/2 open end wrenc the access the "flats" on the solenoid to unscrew it.

The brass seat is replaceable in the Walbro along with the needle. If it's a Nikki, you may need to replace the carburetor.

Hope this helps

When the float in the carb sticks, it allows fuel to drain into the cylinder, that runs pass the rings into the crankcase. When the crankcase is full the pistons cannot go down, and the starter won't turn the engine. Drain all the oil gas mixture, and refill with proper oil. Replace float, needle and seat in the carb bowl. Throughly clean fuel passages, and bowl. If motor won't turn, remove spark plug and turn over engine a few times to remove gas oil mixture from the cylinder too.

Replaced the carburetor had gas In oil. Changed oil, synthetic, 10/30 wt. Adjusted the valves. Started hard flywheel froze. Finally started then jackrabbit. Adjusted the carb throttle, was blowing blue black smoke now blowing white smoke through the exhaust. During one of restarts it didn't blow any color exhaust. Stumped. Riggs n stratton 18.5 riding mower. On fixed income need some close answers

If the float don't float, the needle valve stays open and gas runs into crankcase.

If float floats (has no gas inside) then the needlel is probably worn and needs replacement.

the float in the carb is stuck open, its flooding with gas. the gasoline is going past the rings and/or valves into the crankcase. you need to remove the float bowl and unstick and reset the float to specs, maybe a new seat and needle and change the oil before restarting.

Drain oil... it is full of gasoline due to a bad float pin and rubber gromet in your carb. When your float pin and gromet fail, gas just keeps flowing into your carburetor, eventually flooding your motor with gas and oil mix.

carb. float stuck open
Need to remove carb. replace float needle valve and possibly the needle valve seat,
change your oil also
saturated with fuel