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dbahr122
08-15-2007, 12:19 PM
what is the best sparkpjug to run in a 400ex
davetheslave
08-15-2007, 01:11 PM
The NGK they came with out of the factory
Nates400ex
08-15-2007, 01:55 PM
NGK DPR8z for putting around, DPR9z for high speed....

DENSO X24GPR-u putting or X27GPR-u for high speed.

From the maintenance manual....
CarGuy7a
08-15-2007, 06:37 PM
Originally posted by davetheslave
The NGK they came with out of the factory

mine came with a Denso X24GPR off the showroom floor.