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Project 73 Suzuki GT380

Discussion in 'Other Projects - Other Bikes (non 250's)' started by kiffsta, Sep 7, 2019.

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  1. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Stick hand over carb throat whilst kicking. Should pull lots of fuel.
     
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    maelstrom, Apr 5, 2020
    #121
  2. gregt

    gregt Well-Known Member Premium Member

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    In the case of the Honda, I knew of a twin lead coil listed at a local auto parts mob - owned by Repco - that was very low ohms primary. I'd used it before.
    I think your setup uses all 3 coils in series so you're looking for a very low ohm primary single lead coil - X3.

    Most of the high performance auto coils now are around 2.4ohm primary AFAIK. Unfortunately the catalogues don;t specify.
    How well do you know a local auto parts guy ? Can you go in with a multimeter ?

    Any literature with the Boyer ? What do they specify ?
     
    gregt, Apr 5, 2020
    #122
  3. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    I had a look at the spec's for Boyer ignition on the GT380 and they say to use the standard 4 Ohm primary ignition coil's, same coil's you use for the point's ignition
    https://www.britishbikebits.com/boyer-mkiv-ignition-kit-yamaha-gt380-gt550-gt750-triples



    Found these coil's on ebay, they're cheap enough to be able to test and see if it's your issue ?
    Then you could sell them on if it isn't
    https://www.ebay.com.au/itm/Ignition-Coil-Kettle-Water-Buffalo-FOR-Suzuki-Gt750-Gt380-Gt550-GT-33410-31010/332690891697?_trkparms=aid=111001&algo=REC.SEED&ao=1&asc=20160811114145&meid=cd252a855f914983bf6e8a86b78981fb&pid=100667&rk=1&rkt=8&mehot=none&sd=332690891697&itm=332690891697&pmt=1&noa=1&pg=2334524&_trksid=p2334524.c100667.m2042
     
    Last edited: Apr 5, 2020
    my67xr, Apr 5, 2020
    #123
  4. Suzukititan

    Suzukititan Active Member

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    Or Or you could have gone down this path. This one is a 550. Love the Ducati ducktail.

    IMG_2093.JPG
     
    Suzukititan, Apr 5, 2020
    #124
  5. gregt

    gregt Well-Known Member Premium Member

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    I see what 67xr has posted and yes, the system does apparently work with stock coils.
    I would however point out that the stockers in OE configuration spark once per revolution.
    In series as it appears they are, 3 times per revolution - a modest 7000 rpm is 21,000 sparks per minute
    Which is pushing the boundaries of conventional coils. Let alone old ones.
     
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    gregt, Apr 6, 2020
    #125
  6. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    I'm surprised the boyer ignition doesn't run 3 separate coils, each triggered in turn by the respective trigger coil

    Now this might be out of left field, what about three low resistance coil's on plug in series, some are as low as 1.1 OHM from memory and you may just have a set to hand
     
    Last edited: Apr 6, 2020
    ruckusman, Apr 6, 2020
    #126
  7. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Do you have an earth running from the battery to the frame, and one from the battery to the engine ?
    Sometime's after powdercoating frame's etc the engine wont earth properly, some engine's are rubber mounted as well so no decent earth.
    I've heard of a few engine's than run for a while then lose spark as they're basically just using the clutch cable as an earth.



    I've also read that wasted spark is hard on spark plug's as you're firing them twice as much like the coil's @gregt mentioned many wasted spark ignition's recommend Double Platinum or Irridium spark plug's, they use less power and give a hotter spark so are less prone to buildup on the ceramic insulator's
    It may pay to check your spark plug's if they're the original style copper core's
     
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    my67xr, Apr 6, 2020
    #127
  8. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    I've also read that wasted spark is hard on spark plug's as you're firing them twice as much

    You are firing them more often, but I believe the plugs firing in an empty combustion chamber don't require as much "power" to form a spark. I thought 2-strokes needed a lot more "power" to form a spark as the charge has oil in it. Do 2-stroke spark plugs generally run a smaller gap? Ignore me as I'm just thinking out load.
     
    Frankster, Apr 6, 2020
    #128
  9. Murdo

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

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    If that is true, then the engine will never run. There needs to be timed spark to fire at the top of compression to each cylinder with a 120 degree crank, not at 120 before TDC (piston coming up to compression) or 240 after TDC (power stroke piston going down).
    When you put the points back in did you time them up individually to each correct cylinder?
     
    Murdo, Apr 6, 2020
    #129
  10. kiffsta

    kiffsta Senior Member

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    380 Timing is set from the centre pot at tdc, the weird thing about 380’s is that the timing plate runs off a counter shaft that is fed from the crank. Tomorrow the clutch cover is coming back off and I will do it again and see if I get any better results.

    I Found some coils but they have a 1.2 ohm primary , so scratch them . I have asked a couple of local bike shops what they would use and I was met with a blank stares . Seems everyone uses the Chinese coils
     
    kiffsta, Apr 6, 2020
    #130
  11. Damian_74

    Damian_74 Well-Known Member

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    I fitted these to the GT250 - bolted straight up to the OEM bracket. Not sure the resistance on the primary but can measure tomorrow if you are interested



    upload_2020-4-7_0-20-11.jpeg
     
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    Damian_74, Apr 7, 2020
    #131
  12. kiffsta

    kiffsta Senior Member

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    omg , my chambers are in country

    excited

    C3ABBC1F-87F9-487D-816F-AA463BFAC7E0.jpeg
    I did some work on the bike last week and reset the timing as per the manual, what I have noticed is that my points plate and points cam are mismatched as there were 2 different manufacturers , kokusan and denso. What I have learnt is that they dont mix. I will try and sort that out tomorrow in anticipation of the pipes arriving.

    I did loose a part that screws into the carb and holds the choke plunger and cable , I have checked the Suzuki parts diagram and it is not listed as a part you can buy , lucky I found someone with a spare one who is donating it to the cause.

    the end is near , I can almost smell it ( Castro’s tts)
     
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    kiffsta, Apr 14, 2020
    #132
  13. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    Same sort of issue with early SOHC Honda points apparently. Aftermarket items are a bit off on the back plate markings which creates havoc trying to troubleshoot.
    Still doesnt explain the issue with the Boyer ignition though... still thinking Coils??
    That bike is going to be very nice when it is finally all together... maybe in time for the VJMC Virtual Show and shine??
     
    Andych, Apr 15, 2020
    #133
  14. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    How were they sent @kiffsta? Getting anything sent anywhere right now is next to impossible.
     
    maelstrom, Apr 15, 2020
    #134
  15. kiffsta

    kiffsta Senior Member

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    Sent via a company called parcel to go, it was supposed to be 3 -5 shipping via airfreight , alas it has been 3 weeks but they are at least in country now
     
    kiffsta, Apr 15, 2020
    #135
  16. kiffsta

    kiffsta Senior Member

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    Hello , what do we have here

    BD62EFD5-BCC1-4C4C-AE6D-0AF60091D03A.jpeg 6CABD28F-BA07-48B1-85A7-60927870B015.jpeg

    Loosely fitted , need to find my exhaust gaskets , so excited I think a little bit of wee cane out
     
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    kiffsta, Apr 16, 2020
    #136
  17. Suzukititan

    Suzukititan Active Member

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    IMG_2119.JPG
    Looking very tasty Kiffsta. This has given impetus to my cleanup of the KV100. Your work floor is cleaner and tidier than mine.
     
    Suzukititan, Apr 16, 2020
    #137
  18. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Poor little Titan will be cast asunder, like some flotsam and jetsam, destined to drift aimlessly amongst the cadavers at MotoRecycle.
     
    maelstrom, Apr 16, 2020
    #138
  19. kiffsta

    kiffsta Senior Member

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    She is tucked up safe and sound at home , funnily Enough it is leaking oil from the oil tank... aarrgghhhh. Maybe on the weekend I will sort that out
     
    kiffsta, Apr 16, 2020
    #139
  20. Suzukititan

    Suzukititan Active Member

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    Gee, I hope not. I'll offer to buy it back from him, for what he paid me for it.
     
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    Suzukititan, Apr 16, 2020
    #140
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