Author Topic: NGK DPR8EA-9 plug Will it fit?  (Read 10607 times)

Offline dbethel

  • Jr. Member
  • **
  • Posts: 33
  • Country: us
NGK DPR8EA-9 plug Will it fit?
« on: May 14, 2011, 11:18:09 pm »
I bought 4 spark plugs from a local motorcycle shop, I asked for DR8EA's but when I got home they were DPR8EA-9's.  I called the shop, they say exact same plug, just the tip is 1MM longer.  I am a little skeptical right now, will the piston smack the plug, is the clearance that tight?

D.

Offline George R. Young

  • Moderator
  • Full Member
  • *****
  • Posts: 582
  • Country: ca
    • Concours 2001 Farkles
Re: NGK DPR8EA-9 plug Will it fit?
« Reply #1 on: May 15, 2011, 05:48:22 am »
Erroneous nonsense due to misreading original post deleted.
« Last Edit: May 15, 2011, 07:58:09 am by George R. Young »
65 CB160 (67-69), 69 350GTR (69-72), 72 R5, 73 RD350 (73-84), 82 XZ550 Vision (84-03), 01 Concours C10 (03-19), 89 EX250 (11-14), 00 SV650S (14-16), 03 SV650S (19-)

Offline T Cro ®

  • Administrator
  • Sr. Member
  • *****
  • Posts: 1734
  • Country: us
Re: NGK DPR8EA-9 plug Will it fit?
« Reply #2 on: May 15, 2011, 05:55:16 am »
If I'm not mistaken the 9 at the end is not to do with its heat range and the plug is no longer than the other plug but the projection of the tip is exposed more resulting in better fire.

Correction the 9 stands for 0.9mm (.036”) it's a wide plug gap.... And the P stands for projection.
Tony P. Crochet
(SOLD) 01 Concours Winner of COG Most Modified in 2010
Ask me about a set of Stick Coils & Harness or Precision Shift Linkage for your C10 Concours

Offline Steve in Sunny Fla

  • Full Member
  • ***
  • Posts: 1111
  • Country: 00
    • Shoodaben Engineering
Re: NGK DPR8EA-9 plug Will it fit?
« Reply #3 on: May 15, 2011, 07:18:13 am »
Tony's got it, the 9 at the end indicates a .9mm gap, which is WIDE. It might be ok if you're keeping rpms below 5000, but at higher r's it's going to misfire. Personally, I close all my plugs down to .025" and have no high rpm misfire issues. Steve

Offline gtr1000

  • Arena
  • Full Member
  • ***
  • Posts: 154
  • Country: gb
Re: NGK DPR8EA-9 plug Will it fit?
« Reply #4 on: May 15, 2011, 11:05:25 am »
When I fitted my NGK Iridium plugs a while back, it said on the box not to adjust the gap.

I've just watched the NGK "gapping" video (sad or what?) and they show how to gap an iridium.

Now I might just pull my plugs to see what gap I've actually got as I'm now confused  ???

Anyone know what the Iridium plugs are gapped at when they leave the NGK factory?
Paul OTP (near Windsor, GB).

06 C-10, 2009 to .....
A5 C-10, 2000 to 2009.

Offline medicevans

  • Full Member
  • ***
  • Posts: 137
Re: NGK DPR8EA-9 plug Will it fit?
« Reply #5 on: May 15, 2011, 12:45:17 pm »
My dr8ea plugs were all over the place from the factory. I gapped them all to .025". It takes a few seconds to check. Why not do it? 

I would at least check them. I know mine are standard and yours are iridium, but why not take 45 seconda and check?

Offline gtr1000

  • Arena
  • Full Member
  • ***
  • Posts: 154
  • Country: gb
Re: NGK DPR8EA-9 plug Will it fit?
« Reply #6 on: May 15, 2011, 02:34:24 pm »
My dr8ea plugs were all over the place from the factory. I gapped them all to .025". It takes a few seconds to check. Why not do it? 

I would at least check them. I know mine are standard and yours are iridium, but why not take 45 seconda and check?

Yes, I'm gonna pull the plugs just as soon as I've got through the current tank of gas. As we all know, it's a PITA to take the gas tank off when it's full due to the bloody weight  ::)
Paul OTP (near Windsor, GB).

06 C-10, 2009 to .....
A5 C-10, 2000 to 2009.

Offline DarrellB

  • Arena
  • Jr. Member
  • **
  • Posts: 68
  • If your going to ride. Ride. Forget the trailer
Re: NGK DPR8EA-9 plug Will it fit?
« Reply #7 on: May 15, 2011, 07:05:48 pm »
Yeah I remember the first time I decided to change mine. I had forgotten I just filled up on Friday afternoon. Wow what a weight.
02 Connie with 06 Skin