03-16-2014, 11:51 PM
Just my opinion
Honda calls for ridiculous early replacement on motorcycle plugs. Same type plugs (std NGK) in my ST were replaced at 25,000 miles (called for at 16,000) and looked new. Some on the ST forum have put over 50,000 miles on them. Same type plugs in my Honda Civic call for replacement at 110,000 miles.
These are fuel injected, and computer controlled. On a non modified bike they can't run lean, rich, or misfire. Every firing should be text book as the engineers designed it.
And while I'm harping, why of earth should a standard NGK plug cost $20 apiece?
I might replace mine at 25,000 miles if I feel it needs it. For some of us replacing every 8,000 miles could be twice a year.
Disclaimer: I am not an engineer .... YMMV
Honda calls for ridiculous early replacement on motorcycle plugs. Same type plugs (std NGK) in my ST were replaced at 25,000 miles (called for at 16,000) and looked new. Some on the ST forum have put over 50,000 miles on them. Same type plugs in my Honda Civic call for replacement at 110,000 miles.
These are fuel injected, and computer controlled. On a non modified bike they can't run lean, rich, or misfire. Every firing should be text book as the engineers designed it.
And while I'm harping, why of earth should a standard NGK plug cost $20 apiece?
I might replace mine at 25,000 miles if I feel it needs it. For some of us replacing every 8,000 miles could be twice a year.
Disclaimer: I am not an engineer .... YMMV