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why does my 18 hps moter spark plug has black soot on it

 

Customer Question

why does my 18 hps' moter spark plug has black soot on it

 

Optional Information:
Make: briggs straton
Model: 356477

Already Tried:
replaced valve piston cleaned carb.new coils

Submitted: 338 days and 8 hours ago.
Category: Small Engine
Value: $24
Status: CLOSED

Accepted Answer

Picture
Expert:  Engine Tech replied 338 days and 8 hours ago.

Hello and thanks for using this service,


That happens when the engine is running too rich. Typically the air filter is plugged up and dirty. WHat can also cause this is the carburetor settings. If it is not adjusted correct and running too rich of a fuel/air mix...like when you have it on choke. Check the air filter first before anything.


PLEASE READ BELOW BEFORE LEAVING...Thanks

Expert TypeEngine Technician
Category: Small Engine
Pos. Feedback: 95.2 %
Accepts: 170
Answered: 5/10/2012

Experience: Over 20yrs of experience in small engine repair.

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