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Thread: GS650 Dyna S

  1. #21
    Join Date
    Mar 2017
    Location
    Wales
    Posts
    13

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    Glad it helped ye KYdlux.
    Well after finally having the Gs running great I colour tuned the plugs and most were running very rich and now the plugs are a nice grey colour.
    I decided to take it for a short run but soon as I got it off the stand and into first gear with some throttle it slowly died.
    It struggled to start but was ticking over ok and went down the road and back and died again on the drive.
    I cant start it at now! so will have pull the tank off and start testing.

  2. #22
    Join Date
    Aug 2010
    Location
    Sebago,Maine
    Posts
    7,431

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    Well that's no good! I'd skip the colour tune stuff till the bike was running consistently - might be too lean now.
    my bike gets awoken today after its 5 month nap
    1981 gs650L

    "We are all born ignorant, but you have to work hard to stay stupid" Ben Franklin

  3. #23
    Join Date
    May 2011
    Location
    Vancouver
    Posts
    3,986

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    Quote Originally Posted by Allanc View Post
    Glad it helped ye KYdlux.
    Well after finally having the Gs running great I colour tuned the plugs and most were running very rich and now the plugs are a nice grey colour.
    I decided to take it for a short run but soon as I got it off the stand and into first gear with some throttle it slowly died.
    It struggled to start but was ticking over ok and went down the road and back and died again on the drive.
    I cant start it at now! so will have pull the tank off and start testing.
    I had similar issues with my 650G when I first brought it over from Salt Spring Island. Drove me nuts until I discovered that one ground point in the electrical chain had vibrated (?) itself loose...

    After sorting that out, it would start like a champ, but the idle would start high and slowly work itself down and die. That was sorted out by a good bench and vacuum synch but the idle issues didn't quite go away until I swapped in new carb boots.
    '83 GS650G
    '83 GS550es (didn't like the colours in the 80's, but they've grown on me)

    https://www.fuelly.com/driver/DrockVan/gs650g/sig-us

  4. #24
    Join Date
    Mar 2017
    Location
    Wales
    Posts
    13

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    Ye Tom I know what Ye mean and I may but it back to stock until I've sorted it out but I have done some testing and these are my results.
    battery voltage 12.57 no lights only ignition.
    voltage at coils 1.870 ignition on and Dyna connected
    voltage at coils when pointer is away from Dyna modules 1.870
    voltage at coils when Dyna disconnected 12.28
    Coils primery resistance 2.9 ohms
    Coils secondary resistance 12.60 left 12.64 right
    i have tried to static time it but obviously the light doesn't come on at all through full rotation of the plate.
    i have removed the plate and checked the advancer and rotor for smoth operation that's ok but need to somehow check resistance of the power and signal leads on the Dyna to see if I have a break but a fall in voltage from 12.57 to 1.8 seems like a short? i did check the regulated voltage some weeks ago when running and its was within the specs from the stator pages as some say faulty regulator can spike the modules.
    is there anyway to bench test the modules ? Or have I mist the obvious, thanks BigD 83 I will check the earths.
    Some time ago I got new carb rubbers and pet cock from Cmsl and fowlers ouch! and bench synched the carbs.
    What's strange is the bike was running lovely till I took it down the road.

  5. #25
    Join Date
    Mar 2017
    Location
    Wales
    Posts
    13

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    Well spending some considerable time checking and cleaning all the connections including the fuse box it wasn't in vain.
    I had the same battery voltage at the Dyna when connected but not attached to the engine but when placed onto the mounting the voltage dropped dramatical so I new it had to be a connection issue and finally found the culprits.
    when I orignally rebuilt the bike I had two block connectors behind the headlamp that had deteriated so I took the shortcut and fitted 8 blade crimp connectors, bad idear because these where the culprits.
    I have now fitted new block connectors using a ratchet crimp tool, wow what a fantastic piece of gear. And hay presto she sings again.
    The coils aren't quit up to to battery voltage (about 1.5 volt loss) so may have to do the coil relay mod in the future.
    I have also set the mixture screws back to stock 2.5 turns and will run her in and then colour tune the plugs if they are running too rich , thanks Tom.
    The moral of the story is do things right or they will bit Ye back!

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