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[Screamin08]

I replaced my plugs yesterday, and noticed my rear plug was a lot worse than my front one. It had a lot of white crusty stuff on it. Should I run a colder plug in the rear

[longlast]

I replaced my plugs yesterday, and noticed my rear plug was a lot worse than my front one. It had a lot of white crusty stuff on it. Should I run a colder plug in the rear

   If your using the recommended plug for your motor. Be for mismatching pugs check the gap & see how much of a difference in gap there is. It's possible the rear plug gap was incorrect & not burning right causing the Aquitaine crust on the plug. 
   If you don't have the old ounces, recheck the new ones to be shore the gaps are correct. Run about 500 mi.= 804.67 km & recheck the plug. Then if it's got build up or showing of it I would take it the next step. But watch how hot you go you could do more harm then good over heating the pot.  By the way the crust is'nt going to hert
anything.
                     Good luck.   
                                       pete

[grc]

I replaced my plugs yesterday, and noticed my rear plug was a lot worse than my front one. It had a lot of white crusty stuff on it. Should I run a colder plug in the rear

If there is a significant difference in appearance between the front and rear plugs, you should determine the real reason for that difference and not just try to cover it up by changing heat ranges.  If you're running the correct plugs for your engine, the difference you are seeing is not caused by the plug.

Jerry

[Gettinold]

If there is a significant difference in appearance between the front and rear plugs, you should determine the real reason for that difference and not just try to cover it up by changing heat ranges.  If you're running the correct plugs for your engine, the difference you are seeing is not caused by the plug.

Jerry

[Screamin08]

Thanks to all that replied so far...Good Information....wasn't sure if the rear just didn't run hotter. Put SE plugs in from the dealer. I will check them after I have run them awhile. Im running a Thundermax tuner with auto tune.

[North Star]

Thanks to all that replied so far...Good Information....wasn't sure if the rear just didn't run hotter. Put SE plugs in from the dealer. I will check them after I have run them awhile. Im running a Thundermax tuner with auto tune.

I'm a big believer that if there is one part you should stick to OEM, it's the spark plugs. Ditch the SE plugs and just use the regular stock spark plugs that the bike came with.

[AXIL]

  A white crusty build up on a spark plug is probably excessive oil leaking passed rings and/or valve seals.

[Screamin08]

I'm a big believer that if there is one part you should stick to OEM, it's the spark plugs. Ditch the SE plugs and just use the regular stock spark plugs that the bike came with.

I told them at the dealership that I needed spark plugs for my 2008 screamin eagle road king with 110 motor and thats what they gave me??

[grc]

I told them at the dealership that I needed spark plugs for my 2008 screamin eagle road king with 110 motor and thats what they gave me??

The CVO110 engine uses the same plugs as all the other Twin Cam engines, there's nothing special required.  What they did was sell you a $16 plug (SE) instead of the $4 standard plug (6R-12).  There is no performance difference, but the platinum electrodes of the SE plug should last longer if you decide to not change plugs again for about 50k miles.  In the future, just ask for the standard plugs and change them every 15-20k miles.

Jerry

[Screamin08]

The CVO110 engine uses the same plugs as all the other Twin Cam engines, there's nothing special required.  What they did was sell you a $16 plug (SE) instead of the $4 standard plug (6R-12).  There is no performance difference, but the platinum electrodes of the SE plug should last longer if you decide to not change plugs again for about 50k miles.  In the future, just ask for the standard plugs and change them every 15-20k miles.

Jerry

Thanks for the info!!