iridium spark plugs good for how many miles,

[de dee]

  I HAVE 22,000 KM. ON SPARK PLUG, ON A 300I DT.  ON MY TOYOTA SIENNA i HAVE 200,000 KM. WHAT IS THE LIFE OF THESE PLUGS ON DIFFERENT ENGINES,.

[ophelia]

I think the only way to know would be to ask a Kymco engineer or to test yourself. What spark plug does Kymco specify for the Downtown 300i in the maintenance plan? Copper? Platinum?

[MotoRandy123]

The iridium will never wear away but the ground electrode will, of course it would take a long time.
I'd guess 1,000,000,000 miles! My car recommends 100,000 mile replacement mostly so they don't
get rusted into the block. So change em every 100,000 on that scooter and you'll be OK!

[de dee]

    Kymco does not say what make of plug just a number, I use Iridium because of good name of product, from cars trucks and so on ,. 120,000 miles on my van thats not to bad,. first time the check engine light came on, when I hit 250.000 miles,. miss fire in # 5 cylinder,. by my OBD meter,. So I will change plug on my downtown 300i every two years,  just so it will not seize in the block,. thanks too both of you guys the best to you all ,.   

[sissy mary]

They will last for (almost) forever. I would have one popped in each time you have a valve adjustment done. It's right by the valve cover, so you might as well have it replaced at the same time.

[kiki]

The mine has 24.000 km (=~ 15.000 miles). I asked some time before. The anwser was more or less 40.000 km...