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View Full Version : Need New Spark Plug


ahenicke
09-05-2005, 12:04 PM
WHAT IS A GOOD PLUG TO USE ON A 400 EX. IT HAS WHITE BROS EXHAUST, AFTERMAKET AIR BOX WITH K&N FILTER.
Colby@C&DRacing
09-06-2005, 10:36 AM
NGKdpr8z
Honda#4
10-02-2005, 06:50 PM
or try the dpr9z its hotter if u have the throttle pinned all the time.
Ginxd00
10-02-2005, 07:22 PM
Originally posted by Honda#4
or try the dpr9z its hotter if u have the throttle pinned all the time.
dpr9z is colder,
Higer the number the colder the plug on NGK's
Honda#4
10-03-2005, 01:32 PM
r u sure i thought the higher the number the hotter the spark but i could be wrong.
Colby@C&DRacing
10-03-2005, 01:46 PM
the DPR9z plug is a colder plug.
Honda#4
10-04-2005, 05:19 PM
o okay maybe i got it mixed up with something else
400exrules
06-06-2006, 08:03 PM
so does that mean the dpr9z would be better for riding hard for long periods of time when your engine gets really hot?