Need some help with a spark plug?

[hunda400ex]

I need a number for a 400ex spark plug so i can get a new one? prefferably NGK. Ca nanyone halp me out?

[marksuttonjr]

DPR7EA
9

OR

DP7EA
9

I personaly run the non resistor plugs in everything because they give a hotter spark

[Atreyu]

I use the stock # which is DPR8Z. For higher rev conditions go with DPR9Z.

[04'400ex'er]

I run the DP9EA. It i supposed to lower head temp.'s buy 5 degrees. That helps on a 400EX.

[cals400ex]

Originally posted by 04'400ex'er
I run the DP9EA. It i supposed to lower head temp.'s buy 5 degrees. That helps on a 400EX.


that is what the dpr9z is suppose to do too.


i actually don't know the exact difference between the Z and EA. my utility uses an EA while the 400ex manual says to use the Z.

[k2-dawg]

DPR9Z

D = 12mm Thread Diameter
P = Projected Insulator Type
R = Resistor Type
9 = Heat Rating Number (2 hot - 11 cold)
Z = Thick 2.9mm center electrode Firing End Construction

DP9EA

D = 12mm Thread Diameter
P = Projected Insulator Type
9 = Heat Rating Number (2 hot - 11 cold)
E = 19mm (3/4") Thread Reach
A = Special Design Firing End Construction

I hope this helps. Personally, I only run what the manufacturer or my engine builder recommends.