1977 T140v Coils

Discussion in 'Vintage Classics' started by Eric Carruthers, Nov 16, 2023.

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  1. Eric Carruthers

    Eric Carruthers New Member

    Nov 16, 2023
    0
    1
    Newcastle upon tyne
    Hello all
    I've just joined the forum , and have a question.I've had a lot of bother with my project T140 running rough and back firing . I've replaced both coils and HT leads but now it wont start, seems like a weak spark. my question is should my bike have 2 x 12v coils ( as I have) or 2 x 6v wired in series ?
    Thanks Eric
     
  2. speedrattle

    speedrattle Senior Member

    Feb 19, 2021
    1,099
    243
    appalachia usa
    #2 speedrattle, Nov 19, 2023
    Last edited: Nov 20, 2023
    your 77 should have come with points and a mechanical advance. if youre still running that, then separately-wired 12volt coils are appropriate.

    if you have switched to an electronic ignition like boyer or pazon that fires both plugs every 360 degrees, then they will run better with series-wired six volt coils. but 12volt units in series will still work.

    i have a BSA i installed a boyer into and i kept the 12 volt coils because i am a lazy sod and the new 6volt coils are still in the box. it runs okay but i am not pushing high rpms out of it
     
    • Agree Agree x 2
  3. Eric Carruthers

    Eric Carruthers New Member

    Nov 16, 2023
    0
    1
    Newcastle upon tyne
    Thanks for the reply Speedrattle
     
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