Spark Plug

[Chin_Chilla]

I've been using the stock spark plug since I got my 2002 EX, sometime around October/2001. I'm looking to upgrade to a better brand/more spark, spark plug. Any suggestions and opinions would be appreciated. Also, what is the number of the spark plug, thanks!

[Wheelie]

DPR8Z.

IMO, it's hard to beat NGK. I don't think anything can/will be gained by simply changing to a high dollar plug.

[Chin_Chilla]

I've heard Iridium spark plugs are supposed to be awesome? Are these made for ATV's and more specifically a 400EX?

[lpmaster]

yes dpr7iex-9 i think is the iridium plug for it i've used it and its killer!