Plug chop

[Voltaire]

Now that lead has been removed from fuel does the plug still show the range of colour? ie from scary bone white through to sooty black with the optimum being a nice light chocolate tan? Exhaust pipes now look black no matter what the F/A ratio.

On my old race BMW tending to be looking at plug base ring color to determine mixture and electrode arm to determine heat range.

Once a plug fouls its bin time.

[jellywrestler]

Once a plug fouls its bin time.

have you tried an ultrasonic cleaner?

[Voltaire]

have you tried an ultrasonic cleaner?

👍that’s a good idea.

[Cosmik de Bris]

the rear doesn't *have* to be on the ground.
reading won't be hunnits as it's not under load. but should be close.

Plug problems usually occur under load so revving it up on the paddock stand isn't going to tell you much.

Cheers