Spark plug timing marks

[yellow rose]

My concern would be with the dark spots on the insulator.
That is a sign of detonation.

My guess (a WAG type guess because I'm not seeing it under magnification) is those spots you are seeing is oil specks from detonation knocking the ring seal loose. Not enough detonation to pull aluminum yet.

When they are aluminum they will be shiny and look like little balls under magnification.

Again, that's looking at a picture with a naked eye and no magnification.

It's definitely on the edge though. I'd be scared. And I like to run right at max kill and hope for the best, but that's over the line for me.

 

[famous bob]

A good sparkplug reader: SPARK PLUG READING AS I SEE IT.

2 stroke ????????

 

[Mattax]

A good sparkplug reader: SPARK PLUG READING AS I SEE IT.

Always a few different perspectives on this topic. IMO its worth reading them all.

My concern would be with the dark spots on the insulator.
That is a sign of detonation.

My guess (a WAG type guess because I'm not seeing it under magnification) is those spots you are seeing is oil specks from detonation knocking the ring seal loose. Not enough detonation to pull aluminum yet.

I agree.

Another perspective on spark plug reading from Bruce "Shrinker" Robertson in Australia.
Here's a direct link to the PDF from the Tuner/Shrinker Innovate Forum Archives.
http://gallery.myff.org/gallery/1486369/Sparkplug+reading.pdf
Get it now before since the hosting was taken over and the link may go poof any day.

 

[512Stroker]

Always a few different perspectives on this topic. IMO its worth reading them all.


I agree.

Another perspective on spark plug reading from Bruce "Shrinker" Robertson in Australia.
Here's a direct link to the PDF from the Tuner/Shrinker Innovate Forum Archives.
http://gallery.myff.org/gallery/1486369/Sparkplug+reading.pdf
Get it now before since the hosting was taken over and the link may go poof any day.

Great read for race tuners

 

[yellow rose]

Always a few different perspectives on this topic. IMO its worth reading them all.


I agree.

Another perspective on spark plug reading from Bruce "Shrinker" Robertson in Australia.
Here's a direct link to the PDF from the Tuner/Shrinker Innovate Forum Archives.
http://gallery.myff.org/gallery/1486369/Sparkplug+reading.pdf
Get it now before since the hosting was taken over and the link may go poof any day.

Damn that's the forum I couldn't think of the other day. Don't know why I can't remember innovate forums. Lots of good info on that forum.

 

[Mattax]

Damn that's the forum I couldn't think of the other day. Don't know why I can't remember innovate forums. Lots of good info on that forum.

Maybe because Innovate killed the forum.
Fortunately one guy saved a bunch of the threads somehow and reposted the archived version using myfunforums.
But since Tapatalk took over MFF they've made a mess of things...