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Harley-Davidson uses .040" gap in their engines using this plug.
0.035 inch gap using Champion RN12YC Spark Plugs
NGK BPR6ES Champion RN9YC Champion Rn11YC4 [hotter plug fights carbon buildup
hello,a N2C is the correct one,N3C is the next hotter,gap at .025-.032.
A CJ8 Champion plug can be used with a 1974 lawn tractor that uses unleaded gas, however, it would be better to go with a hotter plug. The hotter plugs will keep the tractor running longer without needing to replace the plug sooner than expected.
Cj8 is hotter than cj7
H-D Brand: 5R6A Screamin' Eagle: EVS13S Accel: 2410A AC Delco: R44NS Autolite: 4265 Champion: RN12YC NGK: BPR5ES-11
THE FACTORY REPLACEMENT PLUG -R44T OR TS .. BUT MOST EVERYBODY RUNS NEXT HOTTER PLUG -R45TS!!!!
depends how long you leave them in the freezer. The best I can remember, the 5R6A is the colder of the two.
This plug is the Champion RCJ7Y.
Champion RCJ6Y
ngk Bm6a its the same plug