A friend and fellow MotorBiker gave me a iridium spark plug and a high performance plug wire. I gave away my last NGKB6HS on a customer repair so all I had left was a Denso plug, (junk.) So after I changed out my carb jet to a 64 and it STILL wasn't running right,(rich,) I was just gonna go get a B6HS. I put in the plug and changed the wire and WHAT A DIFFERENCE. The beastie still takes a minute to warm up, but once she does the little thing SINGS to me.
I always knew the plug and wire could make a difference, I just didn't know HOW MUCH untill now.
I was so happy I rode it over to my girlfriends house, (a 20 mile round trip,) to celebrate.