Typically around .03, or 30 thousandths. But you need look in the manual for your specific engine as the gaps can be different from one engine to another.
.030 champion cj14 is best
GAP .030"
factory gap is 0.027" to 0.033"
The L76V is a surface gap plug. There is no measurable gap.
what to set gap on j8c spark plug
.025
Champion spark plug RJ19LM is for lawn mowers or similar equipment. The standard gap is .030 inches or 0.76mm.
It depends on the brand of plugs. If you use Champion plugs the gap is .035. You can check gap at Champion plugs or search another brand. Hope this helps. the gap is .035 on any plug you use.
.30
.30
.30
.040