440 ex, spark plug question

[Honda_Matt]

Dustin075 is building up his 440ex,

He's got a 440 wiseco 11:1
HD Studs
Cometic Gaskets
HC2 Cam
Edelbrock Carb
Curtis Sparks X-6
& possibly doing an airbox / airfilter mod.

Should he run the stock spark plug, or go colder or hotter?

Switch to Iridium? What are you guys doing with your 440 spark plugs?

[REDRIDDER]

Iridium plug for an ex i dont think so? I would just stay with the NGKDPR8Z plug, just my personal preference.

[drew416ex]

dpr8z or dpr9z

[TRXRacer1]

Originally posted by drew416ex
dpr8z or dpr9z X2