Hmmmm... Either I edited my info after coming home late on a Friday night or that is forum default lol. I don't remember putting that in there

When did they roll on the throttle for the pull?

Ok, pulled the plugs, they look vertually identical. The rear was ever so slightly darker, wouldnt have noticed it had I not been looking for it. Front plug was gapped at .037, rear at .040

https://lh5.googleusercontent.com/-C...2/IMAG0295.jpg

I find that with these new EFI bikes it is not so good to try and get a read on the plug color. Putting a sniffer up the pipes is the only real way to see if the AFR is where you want it.

Another thing you can do is shoot the cylinder heads (right next to the spark plug) with a infrared heat gun.

btw, saw your scraped turn signal and footpeg in the other thread....bet that was fun!

The plugs look fine, maybe just a a bit lean, but typical for EFI.

+1, Just as said. If you'd like to compare them.....heres a chart.

http://www.dansmc.com/spark_plugs/sp...s_catalog.html


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By the little bit i know about color i'd say your front is running correct and the back is running rich,so you can try to swt the plugs around so the 37thou is in the back and the 40 in the front,like guitarman023 said he runs his rear spark plug closed.what the hell could be a cheap fix.As a matter a fact i just put V&H Shortshots on my 09 nightster1200 and if it starts to run funny i'll have a look at that trick.

the pipes look good to me...the rear a little rich, which is good because the rear cylinder gets less cooling so you want it a little richer to help it run cooler...

If it was me I would crank the ViED's all the way up.