[all american boy]

Anybody know how long you have to run engine to get a new 'burn pattern'


on the spark plugs?


So you can take them out and read them.


Do know there are three running conditions or circuits in the carburetor.


Idle, cruising and acceleration.


Trying to figure out how to get the plugs to change to new patterns after changes in the engine.


Sure know what the spark plug chart from Champion looks like.


Use to see them on the counter at NAPA stores.


Always looked at them but never did enough spark plug checks.