[Zomby]

Under "normal" circumstances, how long should spark plugs last before they need changed?

 

[Gonzo1970]

Ive seen plugs last 25k+ miles.

However, at $8 for all 4 of them (Champions) if they Look bad or I Feel like it, I will replace them. The cost just isn't high enough for me to penny-pinch on.

Some people clean them too.. This is another thing I tend not to do unless diagnosing.. then if I clean them and it fixes the problem, I replace all 4.

There is nothing wrong with cleaning them.. I probably would if the plugs cost $10 each, ya know? But at $2... nah

-Gonz

 

[Donut]

The way they are making them now days 100k plus.
In the old days I've seen them when the tip was actually burnt off an I havet not seen that in 40 years.
I don't plan on changing mine even past 100k. I just clean them with WD 40 and a small brass wire brush (found in stores in the welding area). Mine are on 27k and they look fine.

 

[thundrhd]

I'm running on about 45k on the plugs I have right now.

 

[Bassdude404]

Got 22k on the ones my bike left the factory with.....

 

[BigJon]

An easy way to keep them clean is to swap the plugs front to rear every 5-6K and run the piss out of it once a week. The majority of plugs are replaced due to fouling, not wear.