The spark plug is a NGK CR6HS model with a heat range of 6, suitable for gasoline-fueled engines like the Honda CMX250 Rebel, Z50R, and ZB50 models from 1982 to 1988. It features a nickel alloy electrode tip and a 0.028" spark gap, with a 5/8" hex size imperial and a 16mm hex size metric. The spark plug has a 0.7mm spark gap metric and a 1/2" thread reach imperial, with an electrical resistance of 5k Ohms and a terminal configuration of threaded stud.