1. Some members were not receiving emails sent from XJbikes.com. For example: "Forgot your password?" function to reset your password would not send email to some members. I believe this has been resolved now. Please use "Contact Us" form (see page footer link) if you still have email issues. SnoSheriff

    Hello Guest. You have limited privileges and you can't "SEARCH" the forums. Please "Log In" or "Sign Up" for additional functionality. Click HERE to proceed.

Resistor plugs, caps or both?

Discussion in 'XJ Technical Chat' started by markie, Mar 10, 2010.

  1. markie

    markie Member

    Messages:
    975
    Likes Received:
    5
    Trophy Points:
    18
    Location:
    Suffolk, England
    I cleaned and gapped my plugs and noticed they were the correct resistor type (Resistor for UK models anyway) so i was curious about the caps. I checked them with a multimeter and they are about 12k ohms.

    I wonder if its not a good idea to have both but what is the general view?
     
    markie, Mar 10, 2010
    #1
  2. wizard

    wizard Active Member

    Messages:
    5,282
    Likes Received:
    26
    Trophy Points:
    38
    Location:
    DEVON ENGLAND
    not good & 12k? they are normally 5k, dump the caps or the plugs, I run 5k caps & non resistor plugs.
     
    wizard, Mar 10, 2010
    #2
  3. bigfitz52

    bigfitz52 Well-Known Member Premium Member

    Messages:
    21,283
    Likes Received:
    418
    Trophy Points:
    83
    Location:
    Rural SE Michigan 60 miles N of Motown
    Not all XJs are normally 5K.

    The 550s run 10K caps and non-resistor plugs, the bigger bikes generally use the 5K caps.

    Your 12K measured caps were/are probably 10K caps; you could certainly run non-resistor plugs without issue.

    What does the owners manual say? (I'm curious now, gotta go dig out the Clymer book.)
     
    bigfitz52, Mar 10, 2010
    #3
  4. wizard

    wizard Active Member

    Messages:
    5,282
    Likes Received:
    26
    Trophy Points:
    38
    Location:
    DEVON ENGLAND
    bet your boots the book will say 'R' plugs..........
     
    wizard, Mar 10, 2010
    #4
  5. RickCoMatic

    RickCoMatic Well-Known Member

    Messages:
    13,843
    Likes Received:
    66
    Trophy Points:
    48
    Location:
    Massachusetts, Billerica
    Resistor Plugs aren't going to cause you any Ignition difficulty.
    They're supposed to make listening too the AM Radio and CB a little more tolerable and less annoying.

    I don't know how Spark Plugs make listening to Talk Radio and hearing: "Breaker One-Nine for a Smokey Report" less annoying.
     
    RickCoMatic, Mar 10, 2010
    #5
  6. wizard

    wizard Active Member

    Messages:
    5,282
    Likes Received:
    26
    Trophy Points:
    38
    Location:
    DEVON ENGLAND
    If I run resistor plugs AND resistor caps the spark is noticably weaker, has anyone else noticed this?
     
    wizard, Mar 10, 2010
    #6
  7. KrS14

    KrS14 Active Member

    Messages:
    1,642
    Likes Received:
    9
    Trophy Points:
    38
    Location:
    St Marys, Ontario
    When i first got the 400 it had 5k caps and R plugs, spark was blah and orangish. Went to non R and get a nice blue crisp spark.
     
    KrS14, Mar 10, 2010
    #7
  8. markie

    markie Member

    Messages:
    975
    Likes Received:
    5
    Trophy Points:
    18
    Location:
    Suffolk, England
    The Haynes book says "R" plugs for UK bikes - but nothing about caps.
     
    markie, Mar 11, 2010
    #8
  9. bigfitz52

    bigfitz52 Well-Known Member Premium Member

    Messages:
    21,283
    Likes Received:
    418
    Trophy Points:
    83
    Location:
    Rural SE Michigan 60 miles N of Motown
    So I dug out the Clymer; it has a special section for the later (FJ and XJ600) bikes.

    Found out all sorts of interesting stuff about your bike, like the fact that the #2 carb has a different needle than the rest, and the #2 and #3 exhaust cam lobes have slightly more lift than cylinders #1 and #4. The "belt drive" shock adjuster is cool too.

    Not one WORD about spark plug type.

    Throw a set of D8EA's in there and see how it runs.
     
    bigfitz52, Mar 11, 2010
    #9
  10. skeeter

    skeeter Member

    Messages:
    491
    Likes Received:
    3
    Trophy Points:
    18
    Location:
    Iron Mountain, MI
    for what it's worth, i tried to get some non-resistor caps for my friends bike and got nothing but a bunch of grief, run arounds and "i don't think you know what you're talking about" from a bunch of local dealerships.
     
    skeeter, Mar 11, 2010
    #10

Share This Page