Re: Smoking Briggs & Stratton engine

First thing check that valve cover isn't leaking & dripping oil on muffler,after that check all the way around where head meets block,look for oil leakage,this would indicate a blown/leaking head gasket(both common problem on many 12-16 hp briggs)if head gasket bad you may hear a chugging sound at low speed with load on eng,also check valve clearances intake .003-.005",exh .005-.007",as far as knock it may be something internal,worn rings/rod,bearings etc,eng would have to be torn down to check this,remove air filter,check for for oil in air filter assembly,this would indicate blow/leaking head gasket or blow-by caused by worn piston/rings

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