What does my plug tell you

[wildman ben]

Judging from these pictures how does it look, the one side looks decent maybe a little overheated, but the other side has that black build up on it.

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[Efisher26]

Clean it, run it, keep an eye on it. I like Alittle light grey IMO

 

[blsnelling]

It's been used.

 

[1Alpha1]

Run it til it blows, then change heat range.

 

[astnmacgto]

Idk maybe it's just me and to each their own, I'm not here to bash anybody but as long as my saw is in good condition mechanically, starts and runs good and is tuned to perfection I don't worry about what the plug looks like when I change it, now there are definitely problems you can confirm by plug condition, but it's not like in automotive applications where any discoloration or foreign material built up on it is a sign of a problem, these are two stroke engines and are burning "foreign material" every time it goes bang, and like brad said it just looks like a used plug.

 

[drf255]

It tells me it should be changed. And maybe your brand of oil as well.

 

[Little Al]

It tells me it should be changed. And maybe your brand of oil as well.

Possibly more the quantity being used rather than the brand

 

[Little Al]

I"ve never considered a plug chop on a saw to be accurate as unlike a bike /auto it doesn't have a clutch That you have control over so on killing the spark a saw runs on by design so is not a true reading also the design of a saw diaphragm carb in most cases cannot have the adjustment afforded by a more sophisticated carb the 4 stroking out & cleaning up & 2 stroking in the cut is a more accurate setting than plug colour.

 

[vhmtach38]

your plug electrode color ought to match 2+ year old khaki carharts...I have been told.

 

[7sleeper]

That dirt must have fallen into the cylinder when taking out, juging by the amount of dirt on the outside "nut" of the spark plug.

7

 

[Mad Professor]

You need to have it in a good cut and kill it quick to get a good plug reading.

To me it looks a little rich. Should be tan not black

 

[bmwpowere36m3]

You should replace the plug... besides considering oil quality, mix ratio and/or saw operation (not enough sustained WOT/load). With pump fuel reading plugs is near useless. You should start with a fresh plug and kill the engine while at WOT under load. Also you're looking at the base of the porcelain not near the tip.