It depends on the type of ignition. probably 32-35 for points type and 45-60 for electronic ignitions.
GAP .030"
Champion Rc12yc...Denso Q16pru-11...NKG BKR4E
It depends on application, but .030-.035 inch would be average.
.035"
Toro Briggs & Stratton 6.0 77-7330 relace with: Champion RC12YC .030 gap
The gap for the Champion RC12YC spark plug is typically set at 0.040 inches (1.0 mm). This specification ensures optimal ignition performance in various engines. It's always a good idea to consult your engine's manual for specific recommendations, as some applications may vary slightly.
The L76V is a surface gap plug. There is no measurable gap.
Champion spark plug RJ19LM is for lawn mowers or similar equipment. The standard gap is .030 inches or 0.76mm.
the spark plug gap is 0.7 to 0.8 for champion plugs
spark plug gap of 0.7 to 0.8 mm for champion spark plugs rc7ycc or rc9ycc
a gap of 0.7 to 0.8 for champion spark plugs
.30