Spark Plugs

[FLCN72]

How much life have people gotten from their spark plugs?

I've got something like 4000 miles on my '02 and it seems a bit sluggish in the low RPMs. Perhaps a symptom of fouled plugs? Before I go tearing into them I thought I'd ask those who know more than me if 4000 miles is weirdly soon for spark plug replacement.

 

[Kevin in Va.]

The manual states to check them every 4000 miles(6months) and to replace at at 7500 miles(12 months).
I bought a set yesterday , got 6300 miles on it and I feel they need to be changed. Plugs at the local Zuki shop were 4.90 each.
Sure wont hurt the bike none!
Kevin

 

[Kevin in Va.]

Well after posting the last message I decided to change the plugs. They looked pretty good and appeared to be the right heat range, bike has 6300 miles.
Well, I would highly recommend changing the plugs at this mileage, the bike seems to run a whole lot better than it did !

First time I had the bike apart also , wasn't as bad I had thought it would be

Kevin