Kawasaki Concours Forum

The C10, aka Kawasaki Concours - The Original => Accessories and Modifications - C10 => Topic started by: dbethel on May 14, 2011, 11:18:09 PM

Title: NGK DPR8EA-9 plug Will it fit?
Post by: dbethel 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.
Title: Re: NGK DPR8EA-9 plug Will it fit?
Post by: George R. Young on May 15, 2011, 05:48:22 AM: Erroneous nonsense due to misreading original post deleted.
Title: Re: NGK DPR8EA-9 plug Will it fit?
Post by: T Cro ® 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.
Title: Re: NGK DPR8EA-9 plug Will it fit?
Post by: Steve in Sunny Fla 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
Title: Re: NGK DPR8EA-9 plug Will it fit?
Post by: gtr1000 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?
Title: Re: NGK DPR8EA-9 plug Will it fit?
Post by: medicevans 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?
Title: Re: NGK DPR8EA-9 plug Will it fit?
Post by: gtr1000 on May 15, 2011, 02:34:24 PM: Quote from: medicevans 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?

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 ::)
Title: Re: NGK DPR8EA-9 plug Will it fit?
Post by: DarrellB 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.