MG5 Dynastart electric starter.

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  • February 10, 2019 at 3:48 am #30325
    silverfoxfintry
    Participant

    The MG5 manual is quite specific, the impulse timing is set at TDC.
    Also I am using original specification spark plugs, properly gapped at 0.035″.
    I have obtained a replacement coil and I will fit it tomorrow.

    February 10, 2019 at 11:32 pm #30327
    wristpin
    Participant

    The MG5 manual is quite specific, the impulse timing is set at TDC

    So, where does that leave the timing once the impulse has tripped?

    February 11, 2019 at 8:59 am #30328
    expeatfarmer
    Participant

    The spring loaded impulse unit only engages at low revs holding the firing point at TDC, as soon as the engine starts and runs at 600rpm centrifugal force holds back the impulse latch so that it does not engage running the timing at 20deg, btdc.

    February 11, 2019 at 8:04 pm #30338
    wristpin
    Participant

    That makes more sense, so I suppose that the next step is to check that the impulse is actually tripping at TDC at cranking speed.

    February 11, 2019 at 9:47 pm #30344
    silverfoxfintry
    Participant

    Update.
    Well, I have replaced the Magnito coil. (Thanks to Neil Jarret) After a bit of mucking about I got it to start on Saturday.
    Once running, it performed perfectly. No misfires. A nice steady beat. Tick over was slow enough for the clutch to disengage. Acceleration was smooth with no flat spots.
    I took it for a short run round the yard before parking it up.
    Today I started it again. Still a bit fiddly, but a lot better than before.
    I am tracking down a Two Stroke post hole drill and I am going to see if it can be adapted to use as a starter.
    I will keep you all informed.

    February 12, 2019 at 8:19 am #30351
    silverfoxfintry
    Participant

    Just had a thought, Ransome 256. Posted his starting procedure. Neil, you don’t mention opening the choke after flooding. Do you start the Engine using full choke? Or 1/2 choke?

    February 12, 2019 at 8:50 am #30353
    ransomes256
    Participant

    Full choke, drop to half choke once started and easing off as engine warms.

    February 12, 2019 at 9:13 am #30356
    silverfoxfintry
    Participant

    I have always tried to start on 1/2 choke. As per the manual. I will try your method.

    February 12, 2019 at 9:26 am #30357
    expeatfarmer
    Participant

    I go full choke until it fires, if it does not start I go to half choke on second pull.
    My two stroke drill is a Stihl ex british rail.

    February 12, 2019 at 3:06 pm #30360
    andyfrost
    Participant

    Top job , it sounds as if your concerns are over.

    Andy

    March 10, 2019 at 7:24 am #30627
    silverfoxfintry
    Participant

    After a bit of research I decided to purchase a Hyundai post hole borer.
    Adapted it to fit a starting dog and tried it out yesterday.
    Success! Got to have a very firm grip on the borer until the Ransomes engine kickers over, but it started first try.
    I now feel confident that I can use it to extract logs from my Wood.
    Thanks for all the help and advice.

    Iain

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