Guido, your plug looks just about right. Maybe just a tad on the rich. But nothing that you should concern yourself about. If it runs great to you, then just ride on.

 

Thanks Lear-J. The thing is, I look at the published charts of plug pictures and they always have just one picture of a "normal" plug, one with a fairly light ceramic bit, and 6 or 7 pictures of really sketchy plugs. They never show a range of "nearly normal" plugs - a little rich, a little lean. It's either crapped out or "perfect".

Thanks again for your assessment. I think I may futz with it a little more but then, yeah - go ride.

 

ill have to post some pics. im going to switch pliot sizes here soon, if i remember ill do before and afters.

 

That would be good. I'm sure a lot of people would find that educational.

 

One other thing about plug readings is how they get done. By that I mean the only way I've heard that you can get a reliable plug reading is at steady throttle positions. An engine must run at a steady speed and throttle position for several seconds...the longer the better. Then you must kill the ignition and chop the throttle simultaneously, while also pulling in the clutch. If the engine continues to spin a bit, it can still draw fuel from the carb, and the hot plug's reading can change even if it's not firing. Plug readings at idle and transitional throttle positions, like when accelerating and changing gears, are nearly impossible to discern unless the jetting is very, very rich or lean. I tend to agree with those who put a heavy reliance on the performance characteristics of the engine vs. trying to read the plug. That may sound weird, but if you can detect the differences in how the engine transitions from different throttle positions and whether you get detonation, this usually works about as well as anything. I guess the absolute best way is to use an oxygen sensor in the exhaust like FI does. That would be kind of cool. I saw an instance on Thumpertalk where a guy used a dyno and an oxygen sensor. Now that's some serious jetting...LOL!