1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Help FZR250 Coils

Discussion in 'Yamaha 250cc In-Line 4's' started by GreyImport, Aug 10, 2018.

  1. GreyImport

    GreyImport Administrator Staff Member The Big Cheese Contributing Member

    Messages:
    7,524
    Likes Received:
    4,483
    Trophy Points:
    943
    Joined:
    Jun 14, 2012
    Gender:
    Male
    Occupation:
    Troublemaker
    Location:
    North by NW NSW Oztralia - Tamworth
    My Bike:
    *Kawasaki ZXR250C *Yamaha FZR250R 3LN1 *Suzuki GSX250 *Triumph Bonneville 750 T140V
    Does anyone know if this is an 'earth' point for the coils to the frame?

    IMGP1643 a (Medium).jpg IMGP1644 (Medium).jpeg
     
  2. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

    Messages:
    2,673
    Likes Received:
    1,995
    Trophy Points:
    823
    Joined:
    Dec 23, 2012
    Gender:
    Male
    Location:
    Thailand
    Home Page:
    My Bike:
    Yamaha FZR400 3TJ1, Honda MC22
    Much as I love making wiring harnesses, I will never know enough about electronics. Having said that, from the little I know those thingies are the cores for your secondary coils, or some such, and yes, they are earthed. I am sure someone will correct me if I am wrong.
    Here is some coil stuff I came across
    https://www.motorcycleproject.com/text/high_perf_ignition_coils.html
     
    • Like Like x 1
  3. my67xr

    my67xr Senior Member Staff Member Premium Member Contributing Member

    Messages:
    2,703
    Likes Received:
    1,616
    Trophy Points:
    798
    Joined:
    Jun 18, 2016
    Gender:
    Male
    Occupation:
    Panel Beater, Spray Painter, Custom Fabricator
    Location:
    Adelaide
    My Bike:
    Yamaha's, FZR250 3LN3 1990, XT250TS 57R 1986, IT200L 43G 1984
    I cleaned mine up with some wet and dry paper, then put some dielectric grease on the original coil's.
    But i don't think they are earth's, as the coil on plug conversion didn't need any earth's, it rely's on the TCI switching on/off for the earth.
    If it only has a single wire to the ignition coil then yes they're earth point's
     
    • Like Like x 1
    Last edited: Aug 10, 2018
  4. GreyImport

    GreyImport Administrator Staff Member The Big Cheese Contributing Member

    Messages:
    7,524
    Likes Received:
    4,483
    Trophy Points:
    943
    Joined:
    Jun 14, 2012
    Gender:
    Male
    Occupation:
    Troublemaker
    Location:
    North by NW NSW Oztralia - Tamworth
    My Bike:
    *Kawasaki ZXR250C *Yamaha FZR250R 3LN1 *Suzuki GSX250 *Triumph Bonneville 750 T140V
    Yea just going by the fact they are metal and have those metal clips held on of course with metal bolts to a metal bracket that looks to have no rubber grommets or such in the mounting points to the frame .... going on all that metal to metal contact led me to question it :thumb_ups:

    And those pictured are the ones off my bike ... and there was alot of surface 'rust' in that area on all those mounting points
     
  5. Andych

    Andych Well-Known Member Premium Member Contributing Member

    Messages:
    1,374
    Likes Received:
    881
    Trophy Points:
    448
    Joined:
    Oct 6, 2016
    Gender:
    Male
    Location:
    Sydney
    My Bike:
    1987 Yamaha SRX250, Honda 1975 CB400F
    Same mounting for the CB400 coils and they are earths on that bike..
     
    • Like Like x 1
  6. Murdo

    Murdo The Good Doctor Staff Member Premium Member Ride and Events Crew Contributing Member

    Messages:
    4,392
    Likes Received:
    3,567
    Trophy Points:
    923
    Joined:
    May 4, 2013
    Gender:
    Male
    Occupation:
    Retired
    Location:
    Tamworth, NSW
    My Bike:
    Maico 250, Royal Enfield 250, CF 250 V5 and 650TK, XL250, CJ250, CBR250, ZZR250 plus a few others.
    No, I think my67xr has it correct. There is a power wire (usually red) and an earth switched wire from the TCI (green or black) that causes the coils to fire. Won't hurt to clean them as the mounts/bolts will take a bit of heat from a hard worked coil.
     
    • Like Like x 2

Share This Page