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.
GAP .030"
Champion Rc12yc...Denso Q16pru-11...NKG BKR4E
It depends on application, but .030-.035 inch would be average.
Champion 3071
It depends on the type of ignition. probably 32-35 for points type and 45-60 for electronic ignitions.
your dum
I"ve been trying to find an answer to this question myself and belive the Autolite 3924 corresponds to the Champion RC12YC.24-7423 - Champion RC12YC Spark PlugRC12YC Champion Replaces Autolite 3924, NGK BCPR6ES..
Toro Briggs & Stratton 6.0 77-7330 relace with: Champion RC12YC .030 gap
A champion RC12YC spark plug is 14mm thread diameter. The torque for this size is 18-22 foot-pounds (25 to 30Neuton·meters)
.035"
Champion RC12YC, NGK BKR5E-11
Should take a Champion: RC12YC