Is this new spark plug electrode okay?

[user 140828]

Just received this WSR6F plug in the mail. The side electrode covers only about 40% of the center electrode. In my car repair days long ago spark plug side electrodes extended far enough to fully cover the center electrode. Are things different nowadays or is this plug defective?

 

[hotshot]

Probably made in China.

I’d get another with full coverage (correct length) and keep it for a spare.

 

[Wright Saw]

The side electrode not covering the center electrode completely is correct for a two stoke spark plug, it helps reduce carbon fouling.

 

[HarleyT]

Looks like it says China on the plug.
Where did you buy it?
Bosch quality has been poor for a long while.

 

[farmer steve]

Just went and pulled 2 new ones out of my saw box. Look just like that.

 

[HarleyT]

Is that your hair?

 

[HarleyT]

Looking at those 2 examples, looks like poor quality control.

 

[hotshot]

Looks like Bosch China is mixing full & half coverage designs & some in between lols, as I dumped out a new box of 10 & they’re all full.

Actually, either will run fine in saws, but the full coverage run hotter & provide more life as you’re not eroding the same place (or the side out of) the center electrode.

The half coverage exposes more spark to the chamber, as it’s not “hidden” by the ground strap electrode.

Keep it for a spare & buy a NGK, as they are all full!

 

[user 140828]

Hmm, just pulled the one in my MS361 and it's an NGK BPMR7A with the side electrode fully covering the center. Maybe I'm sparking up the wrong tree with the Bosch....

 

[Gugi47]

I use NGK in my saws but looks like the Bosh are like that now. Why? Who knows.
Check this out:

But again here is a other one . The way should be:

 

[HarleyT]

That bottom one is almost touching....

 

[HarleyT]

Hell, just buy Champion,
and only make posts on oil threads!!!!!!!!

 

[HarleyT]

Here is the guy in China that "clips" off the electrode pieces....

 

[Chainsaw Jim]

Here is the guy in China that "clips" off the electrode pieces....View attachment 675136

Damn Harley, it looks like you've been flossing with a molly.

 

[Little Al]

I read somewhere that modern thinking is with electronic ignition systems they work best if the ground electrode end is squared off with sharp edges & square corners as apparently the spark jumps easier/better from a sharp edge, the short ground electrode allows the spark to jump to a solid part of the centre electrode than arc down the side/edge of the centre electrode they reckoned a square centre /half length ground electrode worked best & that one of the plug manufacturers were currently testing producing them but not seen any for sale retail yet may be they are like the other wonder plugs that were going to change the world but the old type still rule Time will/not tell

 

[dmb2613]

and the price of eggs in China is

 

[trappermike]

Various manufacturers have used that design on 2-strokes since the 70's. NGK used to make a race plug for 2-strokes where the ground electrode was at the side of the center electrode. (B8EN). Champion plugs that had a J at the end of the number were this type- ex. J6J.

 

[user 140828]

So okay I'm convinced the one I got isn't defective, I'll keep it as a spare. Thanks everyone.

 

[Charles Bale]

I like NGK or ND plugs, Bosch would be my LAST choice

 

[farmer steve]

So okay I'm convinced the one I got isn't defective, I'll keep it as a spare. Thanks everyone.

Yep just run it. i've only had 1 of those plugs that didn't work. i put it in 3 different saws and had no spark. my stihl dealer gave me another,no problem.