Carb needle valve stuck open clean carb possible bad float dont run with gas in oil
SOURCE: 16 hp briggs ohv v
You could first try resetting the valve clearances. The B & S Website should provide the settings as well as a manual.
SOURCE: I have a b/s
If you have that much gas in your oil it's usually because the float valve in the carburator is stuck open. This allows gas to overfill the carb, it then goes to the cylinder and is thin enough to get by the rings and into the crankcase. It could be because there is something in the valve seat keeping it from closing or the float could be damaged.
SOURCE: Briggs & Stratton Vertical OHV Engine 18 hp
Check your oil.
If it is overfilled, milky, or smells like gas. Your going to need to change that ASAP. It sounds like the float has stuck in the past or is still sticking, and it has flooded the crankcase with gas, which has mixed with the oil. And because it is overfilled it comes through the breather hose into the carb. This also explains the smoke most probably because the oil is spewing in the carb through the breather and being burned.
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