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Spark Plug question

Discussion in 'Motorcycle Tech Talk' started by Lynard, Dec 21, 2013.

  1. Lynard

    Lynard Member

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    Winter time here and doing the little things already to be ready for spring.

    I recently moved up from a soft tail to a 2011 Street Glide. with the 96 motor. Doing what I can in the maintenance dept. Currently it has the stock HD plugs, 6R12, it was suggested to use Autolite when I change them out.

    Question is is the XS4164 Autolite plugs an acceptable swap or should I be using something else?

    Thanks for any help.

    Lynard
  2. hotroadking

    hotroadking Super Moderator Staff Member

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    You can run a compatible plug but understand that the HD ECM uses the spark plugs and wires as part of the knock sensing ION system, if you get plugs that the system doesn't work well with it can retard timing or not run very well.

    HD SE plugs are known to help eliminate false knock signals, if the system is sending false signals the ECM takes a ton of timing out even when not necessary and can lower the power out put of the engine.

    If you change change to the HD SE plugs, it's not much more, they go a long way I'd doubt seriously if the plugs you have now even need changing...
  3. Lucifer

    Lucifer Well-Known Member

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    Here's a cross ref chart...Like HRK said though,I doubt they need to be changed yet...unless you fouled one;)
    HD 6R12 plug is not expensive and you'll know using it and stock wires your Ion sensing system will work properly...The other plugs will most likely work fine too,but if the plugs resistance is a little different than stock plugs it could retard timing.... No performance gain with different plugs and as long as they provide a sharp bright blue spark to ignite the mixture,you're good to go

    http://www.harley-performance.com/harley-spark-plug.html
  4. FLHTbiker

    FLHTbiker Moderator Staff Member

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    I think that comes from the older bikes that people did. Like HRK said the newer bikes are better matched to the Harley plugs.
  5. hogcowboy

    hogcowboy Active Member

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    Can I piggy back a plug question? I don't have a Harley maintenance manual but do have a Clymer. Needed something quick to understand how to change fluids. But in that manual they have a plug gap of, if I remember right, from .035 to .044 or something like that. It's a wide range they suggest. Question is, is there a big difference going say .038 over .040? It seems to me I remember way way back there in my shade tree mechanic days that I would go a little wider gap to get a little hotter spark. Was I all wet then and it really didn't do a thing? I know plugs have changed some since the 60's.
  6. cardboard

    cardboard Well-Known Member

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    I ran the Autolite XS4164 in my bike for 2 1/2 yrs,. Just went back to the Autolite 4164 gapped at 40.
    Great Plugs.
  7. Lynard

    Lynard Member

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    Thanks for the replies, much appreciated.

    Lynard
  8. hotroadking

    hotroadking Super Moderator Staff Member

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    split it at 40
  9. Lucifer

    Lucifer Well-Known Member

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    .038-.043 is HD spec for plug gap....You can run a tighter gap on high comp motors....I just set mine at .040" and wait until the gap widens/wears to .043"....Never had it happen yet,so I just replace them every few years or so 'cause I got tired of waiting for them to wear out;)
  10. hotroadking

    hotroadking Super Moderator Staff Member

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    yeah one of those need something to do projects, you could always check your inner cam bearings for wear :p
  11. Lucifer

    Lucifer Well-Known Member

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    :hilarious:haha
  12. kenfuzed

    kenfuzed Administrator Staff Member

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    I've always used the NGK DCPR7EIX (Iridium) on my Street Glide and same on my sporty. They are pre-gapped at .040
  13. joshbob

    joshbob Well-Known Member

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    Speaking of inner cam bearings . . . How can you tell if you need to replace? I'm replacing my cam soon . . . can the bearing be removed and a new one put in without taking the motor out of the frame?
  14. Lucifer

    Lucifer Well-Known Member

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    You'll have to ask CB about that one;)...Usually though,if you replace cams you should replace inner bearing(Torrington B138 )and lifters...You'll need a blind hole puller to remove the old bearing and you can use your OLD cam and shim to install the new bearing using a soft dead blow hammer...
    I searched the www and found some pics of a guy changing one on an Evo...same deal for your Shovel(same bearing too)
    Apparently you can borrow the puller from Autozone or Tattoo would probably have one...
    http://www.hdforums.com/forum/engin...2822-how-to-remove-evo-inner-cam-bearing.html
  15. hotroadking

    hotroadking Super Moderator Staff Member

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    I would replace your's JB, no telling what the heck
    the guy that built it did, as said above you need a puller
    it's pretty simple to do...
  16. FLHTbiker

    FLHTbiker Moderator Staff Member

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    That was an excellent link with photos Lucifer, you always have such good advice and information. :)
  17. kenfuzed

    kenfuzed Administrator Staff Member

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  18. hotroadking

    hotroadking Super Moderator Staff Member

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    Yep you don't want to hammer it in and bust out the backside of the case...
  19. joshbob

    joshbob Well-Known Member

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    Thanks, guys . . .
  20. Lucifer

    Lucifer Well-Known Member

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    lol, No, leave the 20lb sledge for fixing the kitchen taps...

    Unless you're pressing the bearing in ,you have to tap it in...you can warm the case and freeze the bearing and it goes in pretty easy...

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