Topic: DEA8-L

[donny]

  I was going through the Honda Service bulletins, #27 says; for in town fouling, install D-8ES-L. My Honda guy never heard of it. What would it be sold as today?
Don

[spitfire]

Ther is a thread somewhere on this forum, think D8EA are the ones to go for.

Cheers

Den

[Jonesy]

Ther is a thread somewhere on this forum, think D8EA are the ones to go for.

D8EA is the standard plug. The D8EA-L has an extended tip electrode. (D8ES was the older numbering system)

[HondaMan]

The closest match to that plug today is the ND X22ES-u. This plug is approximately a "D7.4E" heatrange, where the extended-tip "-L" series plugs ran at D7 temps on their tips, with D8 heatsinking in their seals. The ND plug has a thinner, more extended tip, similar to the "-L" plugs.

I normally run the X24ES-u with regular gas on the highway (midgrade with heavy loads) and the X22ES-U on midgrade for commuting work, when there's lots of idling going on, to keep the plugs cleaner. In cold weather commuting, I use the X22 with regular gas to make it warmer and cleaner.

The D8E series is too cold for lots of idling (it fouls after 1000 miles or so), the D7E series too hot for highway use. Honda specifically asked NGK for this plug, in 1970.

The "-L" disappeared from NGK production in the mid 1990s. I miss that plug. 

[donny]

  ..thanks a bunch....

Don

[spitfire]

Thanks for that, I ordered plugs for the bike and recieved DR8ES-L (R for resistor), which kept fouling then I read a thread on this forum which recommended D8EA's so I fitted them, they worked much better, have just ordered some ND X22ES-U's so hopefully they will work even better.

Cheers

Den