u/Bright_Support1249

Found out you can get a NGK iridium DR8EIX and snug a same size nut to the bottom after removing the crush washer and it will fit in the CT90 1969-1975??? The newer 110’s 1981 and above can use it as is but it’s too long for the older ones. I added a simple nut from autozone and snugged it and it works great. Less fouling, easier starts and better performance definitely helps me as I ride my bike in the winter

https://www.ngk.com/ngk-6681-dr8eix-iridium-ix-spark-plug