Results 1 to 9 of 9

Thread: Spark plug cap replacement

  1. #1
    Should Get Out More Pax's Avatar
    Join Date
    Dec 2007
    Location
    Hell On Earth
    Posts
    9,569
    Like
    3,301
    Liked 1,788 in 1,102 posts
    Blog Entries
    2

    Default Spark plug cap replacement

    Quickie - do I need to cut back the HT lead at all before screwing the cap onto the end of the HT lead? ZZR600

  2. #2
    At Work iansoady's Avatar
    Join Date
    Feb 2008
    Location
    Birmingham
    Posts
    1,110
    Like
    94
    Liked 244 in 131 posts

    Default Re: Spark plug cap replacement

    I always chop 1/4" or so off to make sure I get a good purchase on the core (copper core of course).

  3. The following 2 users liked this useful post by iansoady:


  4. #3
    Should Get Out More Pax's Avatar
    Join Date
    Dec 2007
    Location
    Hell On Earth
    Posts
    9,569
    Like
    3,301
    Liked 1,788 in 1,102 posts
    Blog Entries
    2

    Default Re: Spark plug cap replacement

    Idiot here didn't take a photo when I took the caps off weeks ago. I believe it's firing 1243, HT leads are labelled 1 & 4 on left coil, 2 & 3 on right.

    So that means 1 goes to far left, 2 crosses to 2nd cylinder from left, 4 crosses to third cylinder from left and 3 goes on fourth cylinder from left.

    I ballsed this up before years ago on a Bandit so I know what can happen (ran, but super rough), but I don't want to get it wrong as I don't want to run it without the airbox on, which is a PITA to put back on and will need removing again if I fook it up. Plus the bike hasn't run for ages so I won't know if it's just taking its time getting going, as well as having minor running issues anyway.

    Who the fuck dreamt this system up ?

  5. #4
    Should Get Out More Tomcat's Avatar
    Join Date
    Dec 2007
    Location
    Back home
    Posts
    33,493
    Like
    1,411
    Liked 1,888 in 974 posts
    Blog Entries
    11

    Default Re: Spark plug cap replacement

    Quote Originally Posted by iansoady View Post
    I always chop 1/4" or so off to make sure I get a good purchase on the core (copper core of course).
    Me too, since the screw thread inside the plug cap can chew up the (usually copper wire) core of the HT lead. That said it's been many years since I needed to change one, very reliable things IME.

    Firing order for a conventional IL4 is 1342. For a transverse engine I would expect the left-hand cylinder (viewed sitting on the bike) to be No. 1. However many systems these days are wasted spark, meaning the plug sparks at the top of both compression and exhaust strokes, so in theory you could have more than one combination of leads that would work. 1 and 4 fire together, and 2 and 3 together.

  6. The following user liked this post made by Tomcat:

    Pax

  7. #5
    Should Get Out More 1888's Avatar
    Join Date
    Mar 2010
    Location
    JockLand
    Posts
    26,295
    Like
    789
    Liked 2,562 in 1,862 posts

    Default Re: Spark plug cap replacement

    Yes i always snip also. If you look into your HT Lead you will now see a wee hole the cap screw left. Best getting a new snug fit. BTW if they are numbered 1 to 4 how can you fuck that up? Even Val could work that out

  8. The following user liked this post made by 1888:


  9. #6
    Should Get Out More Julian_Boolean's Avatar
    Join Date
    Jan 2008
    Location
    Nearly at the dawn of Britain
    Posts
    13,284
    Like
    756
    Liked 2,219 in 1,333 posts

    Default Re: Spark plug cap replacement

    Leads from one coil go to 1 and 4, leads from the other coil go to 2 and 3, doesn't matter which lead goes to which cylinder, but does matter which coil goes to which cylinder iYSWIM.

  10. #7
    Should Get Out More Pax's Avatar
    Join Date
    Dec 2007
    Location
    Hell On Earth
    Posts
    9,569
    Like
    3,301
    Liked 1,788 in 1,102 posts
    Blog Entries
    2

    Default Re: Spark plug cap replacement

    Quote Originally Posted by 1888 View Post
    Yes i always snip also. If you look into your HT Lead you will now see a wee hole the cap screw left. Best getting a new snug fit. BTW if they are numbered 1 to 4 how can you fuck that up? Even Val could work that out
    Because if the firing order isn't 1234 from left to right, then it makes it ambiguous whether you should just go left to right with the numbered cables, doesn't it? Hence me asking the question. Anyway, I found a copy of the Haynes to download and it looks like, only from the photo mind, as they didn't feel it was important to spell this out clearly (as opposed to clearly telling you which screw to undo ), yes, the leads will go 1234, as coils will go as Julian says. I will verify this by looking at the feeds to the coils, because I did write on the coils themselves what colour feeds went to which coil connector, managed to think of that.

    All I need now is a day that hasn't forecast rain, every day that I planned to do it has had intermittent rain, so I've kept putting it off.

  11. #8
    Should Get Out More a_morti's Avatar
    Join Date
    Jan 2008
    Location
    Gibraltar
    Posts
    11,617
    Like
    1,223
    Liked 923 in 596 posts

    Default Re: Spark plug cap replacement

    Quote Originally Posted by Pax View Post
    Because if the firing order isn't 1234 from left to right, then it makes it ambiguous whether you should just go left to right with the numbered cables, doesn't it? Hence me asking the question. Anyway, I found a copy of the Haynes to download and it looks like, only from the photo mind, as they didn't feel it was important to spell this out clearly (as opposed to clearly telling you which screw to undo ), yes, the leads will go 1234, as coils will go as Julian says. I will verify this by looking at the feeds to the coils, because I did write on the coils themselves what colour feeds went to which coil connector, managed to think of that.

    All I need now is a day that hasn't forecast rain, every day that I planned to do it has had intermittent rain, so I've kept putting it off.
    1234 isn't the firing order. It's the number cylinder counting left to right as you sit in the bike.

  12. #9
    Should Get Out More 1888's Avatar
    Join Date
    Mar 2010
    Location
    JockLand
    Posts
    26,295
    Like
    789
    Liked 2,562 in 1,862 posts

    Default Re: Spark plug cap replacement

    Quote Originally Posted by Pax View Post
    Because if the firing order isn't 1234 from left to right, then it makes it ambiguous whether you should just go left to right with the numbered cables, doesn't it? Hence me asking the question. Anyway, I found a copy of the Haynes to download and it looks like, only from the photo mind, as they didn't feel it was important to spell this out clearly (as opposed to clearly telling you which screw to undo ), yes, the leads will go 1234, as coils will go as Julian says. I will verify this by looking at the feeds to the coils, because I did write on the coils themselves what colour feeds went to which coil connector, managed to think of that.

    All I need now is a day that hasn't forecast rain, every day that I planned to do it has had intermittent rain, so I've kept putting it off.
    Sitting on the bike left hand coil, Short lead pot number one. One being LHS. Long lead pot number 4. Right hand coil. Longer lead pot 2 and you cant go wrong with the last lead.

Go Back to Forum My Forum