Spark plugs burn out

Hi all, does anyone have an idea why the spark plugs burn out so quickly?
i replaced them 2 months ago when the bike ran poorly along with the air filter, and in no time it started doing so again and today on my way back from work it stopped.
i took the plugs out and they were all black at the tip and the ceramic had a yellow color ring, like they were 2 years old.
i think there is something causing this problem because i installed the standard NGK plugs.
your help is much appreciated.

Hi walidcheb,

Sounds like there is a small hole in your Fuel Pressure Regulator Unit in your scooters EFI system.

One more thing...Welcome to the forum.

walidcheb wrote:

Hi all, does anyone have an idea why the spark plugs burn out so quickly?

http://www.ngksparkplugs.com/tech_support/spark_plugs/faqs/faqread.asp

Which is closest to your spark plugs?

I switched to the NGK Iridium plugs and found they lasted longer than the original NGK plugs.

Tell how your plugs look by this link.

http://www.ngksparkplugs.com/tech_support/spark_plugs/faqs/faqread.asp



When both (recommended)plugs are look the same (bad),then you can 't blame the plugs.



Most likely the problem is in the air/fuel ratio.
Like Dennis suggests.

Iridium plugs do not solve a problem.
They only live longer.

Eddy

I agree that I sounds like the spark plug condition is a symptom of another problem.Are they the correct plugs according to the manual? Have there been any other modifications? I have not herd of any one having a ignition coil problem on a S/W but if you could borrow one for a few days it might be worth a try.  Howard

Thank you all guys for the advise, i too agree now that it is not a spark plug issue, as i replaced them last week and the problem reappeared in less than a week.
I will send it to repair next week and will post what was the problem, that is if the mechanic told me what was it, because sometimes they tend to get discreet.
Thanks again.