Denso or NGK spark plug, which one is better?

Answer 1

NGK has performed beautifully in all my bikes.
Denso I never tried.
AC was the best plug in my Mopar.
Champion does very well in my lawn mower, but no place else.

Answer 2

Sorry to disagree with you others, but I agree with Starman when it comes to plug longevity. I'm sure I've been through more spark plugs on my bikes alone than most of you will use on all your vehicles, lawnmowers, etc in your entire life. I've given NGK's and ND several tries but they've never come anywhere close to lasting as long as Champions (my favorite) or ACs. I got tired of the Japanese plugs misfiring beginning at 5,000-7,000 miles (on bikes). I've put over 20,000 miles on Champions that still ran fine, but I changed them anyway. True, NGK and ND are decent plugs and perform adequately for many people, but for my particular needs, driving characteristics and tuning modifications I make, they're a waste of money.

Answer 3

I have the most experience with NGK, have found them to be very tolerant as far as heat range goes. Denso, I do not know anything bad about them. Think you would be happy with either one. In general, they are much more tolerant than
Champion, as to heat range, and fuel fouling. One good thing about Champion, they can be cleaned in a plug cleaner many times, and get no worse on fouling.

Tomcotexas

Answer 4

Definately NGK Or Champion, they both are fine plugs

Answer 5

Depends on the application. Champion plugs are good, they tend to last longer than the others in a 2 stroke if the jetting isn't quite perfect. Choose what runs best for you in whatever you are putting them in.

Answer 6

I like two kinds of plugs and you named them however for some GM cars like Corvette I like AC rapidfire

Answer 7

CHAMPION. BUY AMERICAN.