Opinions on these spark plugs

[Skinner]

Hi everyone,

I went for my first ride of the year today (finally!) and decided to change my plugs after I got home. I've never been good at diagnosing my engine based upon the colour and condition of the plugs. To that end I've attached a pic for your viewing pleasure - please feel free to give me your diagnosis. They are in order, cylinders 1-4, left to right.

Cheers!
K

[Brendan W]

How many miles are on them?
The one on the left is different They look reasonable but cameras can make the colours false.
Overfuelling, intermittent spark from cracked ht lead or lazy cap............

[Skinner]

Maybe 2500km. Taken with an iPhone, colours are pretty close to actual. I'm thinking the left one is running rich, but like I said, I've never been good at diagnosing this.

[azr]

1- too rich 2- maybe a tich lean, 3 & 4 look great but it's hard to tell exactly from the pics. You've really got to look down the porcelain to see the colour aswell

[Skinner]

What colour would a properly adjusted carb show, assuming all else is good?

[Chromedome]

Hi, this is the way I see them, 1 is to rich, by a mile, 2 is to lean, by a mile, 3 is also lean, 4 is the best by far, possibly ever so slightly lean.

[azr]

The porcelain will be white with spaters of tan. Basically as long as you look at it an it shows some form of tan it's good to go. Another good way to tell with your CV carbs is how it's running. One of the members on here has a good CV carb tune tutorial in his signature, just don't remember who.

[chef1366]

1 looks like oil
Check the vacuum line on #2 for leaks
3 & 4 are perfect

[Grimly]

Used to be (and in some areas with decent fuel, still is) you looked for various shades of tan. Now, with the crap that masquerades as fuel, you look for different shades of grey.