I hav a B S 18 HP Vanguard V Twin Duty The engine has lost…

jeff h need help to clarify doubt about: : I hav a B S 18 HP Vanguard V Twin Duty The engine has lost power and is emiting black smoke out of the exhaust
The engine is in a Simplicity Landlord riding lawnmower. Total hours is 282. Well maintained. Both Spark plugs were fouled I cleaned and put back. The Engine Oil is dirtier now than when I started today. I cleaned the air filter and pre clean filter. Still the engine runs rough and is emitting black smoke. All suggestions are appreciated.

Try this:

Answer by ADY2CV
SOUNDS LIKE HEAD GASKET

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