Topic: Anyone have some leftover plugs?

[HondaMan]

I'm looking for (4, natch..) X22ES-U Nippon Denso sparkplugs. These were the "Hot-U" ND plugs for the CB500/550, crossing to the NGK D7ES equivalents. Except they have the extended electrode and U-Groove grounding arm.

I don't even mind if they're used, if recoverable.

Also mildly interested in some X24ES-U, if someone has some of those left...

I can PayPal you for 'em...   

[Zane]

Try these guys Hondaman.

http://www.midwestmoto.com/Merchant2/merchant.mv?Screen=CTGY&Store_Code=MM&Category_Code=dirt-elect-plugs-denso

Although there appear to be none for sale currently on E-bay (I just checked) I have often seen the old California ND Honda Motorcycle TuneUp Kits for sale.  In fact I just got one (with the ES24s however) for my 400F.  I won it for 15 bucks or so, but it came with points and condensors.  I think the same guy had a similar kit with the es22's in it, but I can't seem to find it.

Regardless, maybe you can get them for a couple of bones apiece from midwestmoto.

Good luck.

[Tim.]

What's so special about these plugs?  Pardon my ignorance - I've just always used the stock NGK models.

[Terry in Australia]

Dunno if this is the same item mate, someone slid a "Z" in there, but check it out:

http://www.camskill.co.uk/products.php?plid=m18b230s1387p5500

Cheers, Terry.

[Zane]

This guy might be worth emailing as well (although it looks like this might be old - and "expired" information).

http://www.wctc.net/~wings/plugs.htm


And you've probably already tried these turkeys   http://www.densoaftermarket.com/contact.shtml   I found their website kinda pretty, but almost useless.  I say "almost" only because you can enter your zip code in the "Find a Dealer" section, and it'll give you something pretty close.

[HondaMan]

What's so special about these plugs?  Pardon my ignorance - I've just always used the stock NGK models.

The X22 plugs are like a D7.4E plug: slightly colder than a 7, slightly hotter than the D8E, perfect for heavy in-town driving. They also stay cleaner and give a bit of a midrange torque boost because of their extended tip design. The X24ES-U stays cleaner than the D8E, without the extra heat.

They've long been the perfect ones for my 750, but now very hard to find.   

[Zane]

I wonder if the "U" shape of the ground electrode actually helps make these plugs a little unique?

I do notice in my Chilton book, that the gaps (for a 400F) differ marginally between NGK and Nippon Denso.  You can go a bit wider with the Densos.  I'm looking forward to trying the (wide set) X24's with my GL1000 coils and double sprung ND points.

And while I was looking for ND plugs on ebay, I found this item.    8395686191        I wonder if it would make my motorcycle go even faster yet ..... :-l

[Jonesy]

I read somewhere that the reason why they are better is the notch in the ground electrode. Sparks like to jump from sharp corners.

The way the SOHC coils run, the current flows through 2 plugs- "down" one plug from the secondary winding, through the case, then back "up" the other plug and back to the secondary. In the case of the plug where the secondary current runs "down", the spark jumps from the center electrode to the ground electrode, as conventional sparkplug design intends.

But, for the plug where the current goes "up", the spark is trying to jump from the ground electrode to the center electrode. The broad, flat face of the ground electrode is not the ideal surface for spark propogation, although it does work. The groove in the ND ground elecrode offers a better condition for the spark to jump. This is most beneficial at idle speeds, when coil voltage drops along with alternator output.