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Need New Spark Plug
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Posted by: ahenicke

WHAT IS A GOOD PLUG TO USE ON A 400 EX. IT HAS WHITE BROS EXHAUST, AFTERMAKET AIR BOX WITH K&N FILTER.

Posted by: Colby@C&DRacing

NGKdpr8z

Posted by: Honda#4

or try the dpr9z its hotter if u have the throttle pinned all the time.

Posted by: Ginxd00

quote:
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

Posted by: Honda#4

r u sure i thought the higher the number the hotter the spark but i could be wrong.

Posted by: Colby@C&DRacing

the DPR9z plug is a colder plug.

Posted by: Honda#4

o okay maybe i got it mixed up with something else

Posted by: 400exrules

so does that mean the dpr9z would be better for riding hard for long periods of time when your engine gets really hot?