NGK plugs are the best. Run them in everything.
Dennis - June 10, 2015
Bought these just because of age and mileage. The original plugs were a little rusty but not causing problems. These new NGK plugs work great. Same performance so far. Old plugs were original and 8 years old.
Bill - April 15, 2015
(Fort Myers, FL)
A Better Plug
I purchased these plugs for my Harley after having such good experience with NGK in my sportbike. The factory plugs have done well, but seem to have had some problems with more recent reformulations of premium gasoline. So, I'm looking to the NGKs to provide the same clean, hot burn in my Twin Cam as they've done for my 600.