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Take a look at these plugs - darker one is for the rear.

2011 FLTRU with SE Ventilator AC, CVO slip-ons and de-catted head pipe. Using Power Commander V for tuning.

No power issues - no idle issues. No issues at all really other than doing normal maintenance and decided to check the plugs at 15k miles. Last replaced at 10k.

I am am happy with the front. The rear looks like it has carbon deposits on it.

Thoughts?

 

I agree

 

So what would cause this?

 

Your running fat on the one cylinder, the piston wash might tell another story however.

 

Check for a exhaust leak on the rear. Header pipe sometimes comes loose. Just put a wench to it and give it a turn until tight. Also check the front while your at it.

 

Thanks, but what do you mean by piston wash?

I will check them. Wouldn't an exhaust leak make it lean? I know an intake leak would but not sure what symptoms an exhaust leak introduce.

UPDATE: Checked the headpipe bolts and all is good! Not saying they couldn't be leaking but the bolts are tight!

 

What about EITMS? And how does that play with with the Power Commander? Since the PC adds a percentage of fuel, will it cause fuel to be added while EITMS has been activated?

I know this is turned on and with it being so damn hot here in Dallas, the rear cylinder has been shut down a few times at red lights

 

Has the bike been dynoed?
If not it could be leaned out some, but that might/probably make it run hotter yet.

 

It hasn't been dyno tuned. Before I do that, I would just pop for AutoTune to go along with the PCV. The only reason I haven't done that already is that I would have to replace the headpipe as the O2 sensors for AutoTune are different sizes than the ones on my bike (and they need to be closer to the head too, I believe).

 

I would think lifter or valve issue with the cylinder that has the carbon buildup?