.045
.030 is the correct gap.
.028 or .030 pick your favorite one.
The proper spark plug for 4hp Briggs & Stratton is a J8 which I use in all my motors.
what is the champion cross reference for a briggs and stratton spark plug 691043
It is probably a Briggs & Stratton engine. You will need to supply the model number from the engine to get a correct gap.
Champion Spark Plug QC12YC
Champion RJ19LM
Champion rj19lm
0.020
.030
0.030 is the gap for briggs and stratton 4.5 hp mower
what plug size fits a 3.75 briggs and stratton,and a 19.5 briggs engine and what is the gap. thank you