Topic: Installing D7EA vs x24ES-U CB750K1

[pjandrew99]

Switching to D7EA to try them out.
It seems to me like the x24ES-U snugs right up with a short tug. The D7EA gave me that "I could strip this if I'm not careful" feeling when putting those in. Has anyone else noticed that? I tightened them as much as I thought was safe but seemed like I could have gone a bit further.  Wasn't comfortable doing that.  Thanks

[Scootch]

I have used both. I haven't noticed anything. But like you I am very concerned and conscious of stripping stuff.

[grcamna2]

The threaded part of the Japanese 'Nippon Denso'/ Denso? sparkplugs has always been Solid and a great match to the threads;I think the quality of steel(Nickel)in the original Nippon Denso Japanese plugs(now NOS)was superior to all other spark plugs I had ever used. The authentic China Denso brand name plugs is as good as the NGK's imo.

[seanbarney41]

Could be what you are feeling is a difference in the sealing washer, but I don't know for sure as I have never installed a Denso plug before.  When you torque the spark plug, you are achieving a certain amount of crush on that washer.  So, if the NGK washer happened to have more "crush" to it, that is why you get that stripping feeling.

I recently bought a cb750 that had extremely tight spark plugs.  The 2 outside came out fine with some excessive force and showed to be Denso's.  I did notice the extremely high quality of the threaded portion.  Unfortunately, plug 3 was not a Denso, was a Champion, and had already been broken off by someone previously and just left in the hole.

[Don R]

 I despise Champions and have also been PO'ed at a couple ngk's in bikes, engines, or heads I bought.

[seanbarney41]

Good lord, champions are terrible crap even when they don't break.  Cant count the number of times fiddling with new to me vehicle and one or more cylinders are missing or it won't start period...go to check the plugs and bam...Champions.  Champions of the sucking ass olympics...