Spark plug ? NGK DPR9EA-9


5 replies to this topic
  • slowxr

Posted December 19, 2005 - 10:40 AM

#1

This is the plug that I pulled out of my 03 650R. Apparently, that's not the plug the manual recommends.
I'm wondering if I screwed up or if that was a recommended plug that I read about some where? Anyone know?
Thanks

  • danny v

Posted September 18, 2007 - 09:15 PM

#2

i just bought a honda xr 600 r 1998.the plug is a ngk dpr8ea-8 the #9 used is one size hotter for riding in very cold weather good luck ! :thumbsup:

  • cleonard

Posted September 19, 2007 - 09:39 AM

#3

NGK plugs get "hotter" as the number gets smaller, so a 9 is one heat range colder than an 8. The "P" in the plug designation refers to a projected electrode. I know that it is important to run the projected electrode type in the aircooled engines, don't know about the 650R.

For extended high speed operation in hot temps a colder plug is recommended.

The 650R stock plug is a BKR7E-11. That's two heat ranges hotter than what you had in there. Otherwise the stock plug is missing the projected electrode, it has a different hex size, and the gap is larger.

http://www.ngksparkp...rtnumberkey.pdf

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  • martinfan30

Posted September 19, 2007 - 09:55 AM

#4

also, the heat range is just how quickly or slower the plugs radiates heat away from the head.

a plug doesnt generate any certain amount of heat.
:thumbsup: :thumbsup: :thumbsup:

also, the P stands for platinum. it does on ND plugs. by that chart it does for ngk too.

  • cleonard

Posted September 19, 2007 - 11:57 AM

#5

also, the P stands for platinum. it does on ND plugs. by that chart it does for ngk too.


It depends on where the P is in the part number. Before the heat range and it means "projected insulator type." If it is after the heat range then it means "premium platinum".

  • danny v

Posted September 21, 2007 - 09:21 PM

#6

SORRY,I WAS TOLD THE HEAT RANGE GETS HOTTER WHEN THE # IS HIGHER
MY MISTAKE.I PRINTED THE CHART THAT WAS ON THE NEXT POST,COOL STUF AND THE RIGHT INFO THANKS :thumbsup:





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