Denso alternative to NGK D8EA

[hank2]

I've read of people saying that the non resistor NGK D8EA spark plugs are getting harder to find. I did find some sellers that still had them but the NGK site says they're history. They refer you to the DR8EA. Looking in the manuals for my GS650G, I noticed that the Denso X24ESU was the alternative. I found those on Rock Auto, they're now called Denso 4099. You can still find them by X24ESU. I got 4 of them at $1.31 each plus $3. postal shipping. Not bad.

This may be common knowledge but I couldn't find any posts about Denso plugs. I realize they're not the Nippon Denso of old quality. The box stated that they're made in Indonesia with Japanese and Indonesian parts. In my case, I just wanted to have some spares for later.

 

[rphillips]

Denso X24ES-U. I don't guarantee my info. Look up cross reference chart for your plug.

 

[fbody_mike]

Or, just run the DR8EA and remove the resistor in the boot and replace it with copper or welding rod. Honestly I doubt you will notice a difference if you double up on the resistance by leaving the resistor boot and also using a resistor plug.
I noticed Suzuki changed their catalog for my 85 GS550E from the original D9EA to DR9EA, I can still get the D9EA from NGK and the local shop so I don't know why they changed it other than maybe it is also out of production.
For electronically controlled iginitions (non-points) I do not recommend going resistor-less.

 

[Gorminrider]

Honestly I doubt you will notice a difference if you double up on the resistance by leaving the resistor boot and also using a resistor plug.

yes, I've used both and I can't notice any. I believe "resistance" is not what many people think it is, in this application. It's not a DC circuit like the headlamp or turn signals.

But the D8s are not yet so rare. Stock up! if you feel a pinch. The result of a run on the D8s may cause a surge in demand and encourage the manufacturer to make more

 

[hank2]

All very good information but personally I'll use the factory recommended and cheap Denso 4099. For as long as they may be around.

 

[850 Combat]

Gee whiz. I've been using B8EP. I'll gave to recheck the manual

 

[Cipher]

I have used resistor plugs and had no negative impact. Same coils same ignition 37 yrs 80000 kms in all kinds of weather.

 

[Gorminrider]

They work , I'll use the resistor plug in a pinch-does no harm- but the manual's "correct" plugs make me feel better. The stock plug (resistorless) in theory will have a better spark...
as to mods that reduce the OEM "resistance", I read that apparently Race bikes don't want any resistance/reluctance they don't absolutely need because higher rpms don't allow the best Dwell for the best spark(ie: "reluctance" has a time factor)... but I also read it's harder on the ignition system too and don't want to risk my old TCI boxes!