B8ES plugs too big for the head on GS400

[Guest]

In countless spots online is says to buy B8ES plugs for the bike but both of my 400's run DR8ES plugs (smaller)

I bought some B8ES plugs and they cannot be used because the threads and overall girth of the plug is much bigger than the DR8ES that are on the bike.

These heads arent all the same or am I missing something here?

[BassCliff]

Hi

There are a few GS bikes that use D8EA plugs as opposed to the B8ES. "D" signifies 12mm and "B" signifies 14mm.

More info: http://www.sudco.com/spark.html#stand

General Suzuki Specs


Thank you for your indulgence,

BassCliff

[Steve]

By the way, the stock plug is a D8ES, not a DR8ES.

If you have stock plug wires with resistor caps, you don't want the resisitor plugs, too (DR8ES).

On the other hand, if you have aftermarket wires and non-resistor caps, go ahead with the resistor plugs.

.

[chef1366]

By the way, the stock plug is a D8ES, not a DR8ES.

If you have stock plug wires with resistor caps, you don't want the resisitor plugs, too (DR8ES).

On the other hand, if you have aftermarket wires and non-resistor caps, go ahead with the resistor plugs.

.

His AM radio won't buzz

[Nessism]

The Canadian Spec GSX400 (later model) uses an 4V/cylinder engine, so the 12mm plugs are applicable. It's the early 2V/cylinder engines that use 14mm plugs.

[Steve]

The Canadian Spec GSX400 (later model) uses an 4V/cylinder engine, so the 12mm plugs are applicable. It's the early 2V/cylinder engines that use 14mm plugs.

Yeah, I forgot that little detail, since I don't do much with twins.

I think the only "2-valve" GS engine with the smaller plugs is the 650.

Could be wrong (again), though.

.

[BassCliff]

Hi,

I just wanted to note; the NGK D8ES has been replaced by the D8EA.


Thank you for your indulgence,

BassCliff

[Mekanix]

DR8ES-L is what is called for in my 1981 gs40x supplement manual for the Canadian model's. Not sure why though

Even has factory plug boots with resistors.

I've always used them and not given a thought to it until I just read this post :P

Might switch over to d8's, Hope nobody minds a little EMI


Check this out http://www.ngksparkplugs.com/techinf...tnumberkey.pdf

Hi,

I just wanted to note; the NGK D8ES has been replaced by the D8EA.


Thank you for your indulgence,

BassCliff

That means the tip isn't the usual type and is a special design according to the chart.

I wonder whats so special about it?

[Dfrnt]

DR8ES-L is what is called for in my 1981 gs40x supplement manual for the Canadian model's. Not sure why though


I wonder whats so special about it?

It's actually a half heat range cooler, as in halfway between an 8 and a 9.

[Mekanix]

Makes sense. Thanks :-)