Review on NGK Iridium IX DCPR7EIX Spark Plugs: Harley Davidson Twin Cam (Pair) - 1999-2016 Model Years by Jonathan Roloff
Had to replace and put back the old spark plugs
Worst spark plugs. I have always used NGK on my dirt bikes and on my boat. Put it in my Harley Elctra Glide Classic and it pops out on start up. The strength seems to have diminished. I reinstalled my Harley Davidson spark plugs. They had 8000 miles on them. The bike became smooth and rode normally. No pop at startup. The release on the NGK was ok.
- Decent performance
- I vaguely remember
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