how often should plugs be changed?

[400EXride]

I have a 400EX and wanted to know how often should the spark plug be changed?

i had mine for 2 years and a **** ton of hours and never changed it once from the stock one that came with it. Im doing the same thing with my 450r

[quader400]

i just pulled mine out for the first time since it was bought in 99(6 years later). it was dirty but still works fine

[Sjorge450R]

damn, I change them after every race.....

Originally posted by Sjorge300EX
damn, I change them after every race..... do you know why?

[desertrats]

I change mine every month along with oil and oil filters and all that stuff. I dont know if it helps at all but it just makes me feel more comfortable, thought I do notice it starts quicker.

[Sjorge450R]

Originally posted by MixMasterMike
do you know why?

just so in case it is or is begining to foul out. Also to make sure that I am running right.

Originally posted by Sjorge300EX
just so in case it is or is begining to foul out. Also to make sure that I am running right. how often do you change the plugs in your vehicles? everytime you go somewhere? Doubtful, plugs last a long time if your engine is running right. ESPECIALLY if you are running good spark plugs. I like NGK's iridium...your wasting your money every race

[Old Head]

I'm sure the pro's change their plugs for every race. I doubt you have to but it would be one less thing to worry about. personally I change mine about 1 time a year.

[JOEX]

Originally posted by MixMasterMike
how often do you change the plugs in your vehicles? everytime you go somewhere? Doubtful, plugs last a long time if your engine is running right. ESPECIALLY if you are running good spark plugs. I like NGK's iridium...your wasting your money every race
I ran the same plug for a couple of years also, when I did change it the motor seemed to run better;)

[Rip_Tear]

Mines still from stock... The one from my 95 300 is still good too. Just take a wire brush and clean the end off and it should be good to go... I'm in the process of getting a spare incase, but don't plan on needing it.

[Sjorge450R]

the other reason I change it is because when I raced my 90 we always had to change it so I figured it was the same on the bigger quads.

[coolex]

my stocker on my 250ex is goin on 4 years

[Honda TRX250ex]

I change mine when it wont run on the old one anymore.