12,000 miles on original plugs...

[fazer.rider]

i've been meaning to change them but just gotten lazy and the bike runs fine. what are the symptoms when the plugs are starting to let go? thanks

 

[LERecords]

dunno, but i have roughtly 14k on my stock plugs.. bike runs fine...

 

[TownsendsFJR1300]

i've been meaning to change them but just gotten lazy and the bike runs fine. what are the symptoms when the plugs are starting to let go? thanks

Misfires, mostly under load....

 

[FZ6771]

i've been meaning to change them but just gotten lazy and the bike runs fine. what are the symptoms when the plugs are starting to let go? thanks

hard to start,cuting out , backfireing

 

[Gcontroller]

Got 20 thousand on mine. Plan to change them when I have the valves checked unless the bikes starts acting up. I already have a set.

 

[VEGASRIDER]

Got 20 thousand on mine. Plan to change them when I have the valves checked unless the bikes starts acting up. I already have a set.

I change mine out at 20k too. Hit the search and you'll find my pictures of what they looked like after 20k miles too. They were fine, and the bike was running fine too but I opted to upgrade them to the Iridium plugs. Which I understand have a longer life than the stock. So I imagine I'll get 40k on these.

 

[RJ2112]

23K and change.... starts and runs fine......