Spark plugs

Discussion in 'Engine, Fuel and Exhaust' started by ryankesterholt, May 13, 2010.

  1. ryankesterholt

    ryankesterholt New Member

    1
    0
    0
    i have the screaming eagle triple platinum in mine. i got them for free is the only reason i use them. Do these type of plugs affect the ion sensor since they are made for harley i wouldtn think so but i dunno?
     
  2. Hoople

    Hoople Account Removed

    7,198
    0
    34
    Re: spark plug poll

    I would think as long as the plugs your installing have the same resistance as the standard 6R12 plug you should be OK. Now a standard 6R12 HD plug that fits my 2009 FXDL has 36.4K ohms. That is not a misprint and that is a bunch. If the plug your installing has that high a resistance, I would guess you would be OK and the ion sensor will perform properly..
     
  3. glider

    glider Veteran Member

    25,464
    108
    44
    Re: spark plug poll

    The fancy plugs have been known to set a code due to the ION sensing but usually after they have a few miles on them.
     
  4. Hoople

    Hoople Account Removed

    7,198
    0
    34
    Re: spark plug poll

    And the Ion Sensor needs to work properly so why take the risk of running anything but the right plug.. Take 1 look at some of these spark advance numbers from a stock factory map from my 2009. (If it displays correctly) the left column is RPM top to bottom and "engine load" is from left to right with far right being WOT.

    Look at all the high 30's and 40's of degrees of advance.Your engine could never live a long life without some sort of spark retard kicking in when you quickly twisted the grip from a light load map in the 3000 RPM range.


    Harley Davidson Community
     
  5. Jack Klarich

    Jack Klarich Expert Member

    18,544
    153
    399
    Re: spark plug poll

    Good place to post this it should get read here
     
  6. nvsteve

    nvsteve Member

    76
    0
    0
    Re: spark plug poll

    Between this post and your next with the attached ignition advance chart you've convinced me to at least check the resistance on the plugs I'm currently using. Although I've had no issues using other than stock plugs I may not be getting the best performance.
    Thanks
     
  7. nvsteve

    nvsteve Member

    76
    0
    0
    Re: spark plug poll

    Ok, I tried checking the resistance on several plugs and don't get consistent readings. Maybe I'm not placing the probes in the correct place?
    Where would that be?
     
  8. Hoople

    Hoople Account Removed

    7,198
    0
    34
    Be sure to start with your meter in the 200K range and work down. (you may not have to).

    Place 1 probe of your meter on the same contact point as the coil wire goes and the other meter probe to the center electrode (part that goes inside engine)

    Se what you read.
     
  9. nvsteve

    nvsteve Member

    76
    0
    0
    That's what I was doing. Possibly I was also touching the ground strap.
    Thanks
     
  10. Hoople

    Hoople Account Removed

    7,198
    0
    34
    Re: spark plug poll

    It would not matter if you were touching the ground strap at the same time.
    It should be a straight forward reading.

    When you say the readings are not consistent, what do you mean. If may drift a decimal point or 2 but that should not matter. The fact its happening on several plugs tells me it's either the range the meter is on or it's a problem with the meter itself. What type of meter is it.