View Full Version : Spark plug identification

04-26-2016, 7:46 PM
And done one tell me their opinion on this spark plug. The engine has no popping but the plug looks hot to me.Firestone Deluxe Champion 4-19

04-26-2016, 7:47 PM
Oops I pasted the wrong link. Here's the plug.http://i1146.photobucket.com/albums/o528/sdustin/20160426_212745_zpsswydonme.jpg (http://s1146.photobucket.com/user/sdustin/media/20160426_212745_zpsswydonme.jpg.html)

04-27-2016, 6:00 AM
Id say it looks pretty good, fuel wise.
Black ring = rich on the bottom end. Tan electrode = good mix up top. But the ground strap is tan all the way, you want the color on the strap to change right around the the middle/bend
Start tweaking the timing.
What bike is this in? And what have you done to it?

04-27-2016, 12:19 PM
Looks good to me too. A tan insulator (white part around the center electrode) is the desired condition.

If the bikes running great, I don't see any cause for concern.