21 hp briggs & stratton Platinum

[greek1953]

I have a 21 hp Briggs & Stratton Platinum starts easy. It started popping & cracking I put new carburetor,new air filter.fuel filter,new spark plug, & set valves! Spark plug seems to foul quickly. Does anyone have any ideas on what else it might be.

 

[bertsmobile1]

I have a 21 hp Briggs & Stratton Platinum starts easy. It started popping & cracking I put new carburetor,new air filter.fuel filter,new spark plug, & set valves! Spark plug seems to foul quickly. Does anyone have any ideas on what else it might be.

Re: 21 HP Platium popping & cracking

first idea is to check the timing key in the flywheel.
Too far retarded will cause the plugs to soot up and the engine to run bad when the throttle opens up & the revs increase
Check that the choke is fully off when the engine is at full throttle.
This will also cause the engine to run bad and soot up the plugs.
Check the oil .
If it is thin & smells a bit like fuel then the float valve in the carb is not cutting off the fuel.