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Thread: coil gap

  1. #1
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    coil gap

    I thought coil gap was supposed to be 0.030" but I was reading on here last night about jetting and someone suggested more than that. Like 0.085 or something like that. Will more gap create a hotter spark or what is the benefit of increasing coil gap. Talking about clone/predator with ARC flywheel.

  2. #2
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    Won't burn your coil up.
    Due too the stronger magnets in the ARC flywheel .
    Last edited by flattop1; 01-11-2019 at 01:24 PM. Reason: add

  3. #3
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    Quote Originally Posted by flattop1 View Post
    Won't burn your coil up.
    I don't think it will. If anything it wont fire. I found a post here that shows a graph of the ign. timing retarding at high rpm with a closer gap. Opened the gap up and it stayed at the set timing. So I guess I will try some different things and see.

  4. #4
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    Arc recommends. 030 minimum.
    Reason 1 crank flex.
    Reason 2 coil failure.

  5. #5
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    We’ve always ran ours at .080-.085, plus the further from the magnet the less resistance.

  6. #6
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    Quote Originally Posted by flattop1 View Post
    Arc recommends. 030 minimum.
    Reason 1 crank flex.
    Reason 2 coil failure.
    Makes sense to me. Wander why they don't tell you maximum gap.

  7. #7
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    Quote Originally Posted by Kj26 View Post
    We’ve always ran ours at .080-.085, plus the further from the magnet the less resistance.
    Thanks. That's where I will start gapping ours.

  8. #8
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    Quote Originally Posted by T-roy View Post
    Makes sense to me. Wander why they don't tell you maximum gap.
    They might if you called.
    I checked the blog .
    Instructions come with new .

  9. #9
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    Crank flex is a big issue with these engines.
    .085" sounds right to me.
    I'd be interested in seeing the timing retard chart if someone has the link.
    I did this with the old flathead coils/flywheels 20+ years ago, and have been tempted to repeat this testing (when I can find time) with the LO206 (PVL) ignition.


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  10. #10
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    I don't know how to post a link, but I will try. May not have been a clone but mounted the same way. I think. HMMM

  11. #11
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    Okay. Its a Gx160 that is being tested but I think it still helped me understand.
    https://karting.4cycle.com/showthrea...y-a-bit-faster
    Last edited by T-roy; 01-11-2019 at 03:18 PM. Reason: Testing

  12. #12
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    Its confusing in the video and paperwork on installing the flywheel. Should say "Set gap to 0.065" to 0.085" (or whatever). But don't install the coil with less than 0.30"." Or maybe I misunderstood which is possible.

  13. #13
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    There was a post I saw on here a while back that said to start with the air gap out as far as possible to start . Then bring the gap down little by little until the engine starts easily . I set mine at about .060 and have never had an issue with burning up a coil . My buddy had one , that was set at about .075 or more , but still fried coils like crazy , so the flywheel got pulled , and haven't had any problems since .

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