Rj19l
champion LM 19
Rj 19 lm
cj14 i just picked one up for it today
You may do serious damage to the lawnmower if the wrong spark plug is installed.
yes
Your owner's manual should explain that.
.030"
This is a Tecumseh engine. According to the Tecumseh web site all small engines have a 0.030 gap
yes
.030"
Depending on what lawnmower you have just simply take the spark plug out and tilt lawnmoer