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Help with dyna s ignition on 1977 gs750

  • Thread starter Thread starter bplubin
  • Start date Start date
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bplubin

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I hope some can help me I just purchased a dyna s ignition for my 77 gs750 and can't get the darn thing to time right.Sat on the phone on hold with tech asst. for over an hour with no response. timing instruction not to clear cut. I worked on cars for over 15 year but this thing is driving me crazy. i had the thing installed in less than a hour but can't get the thing to run right anyone help would be great Thanks in advance
 
Does it run at all?

EDIT: Deleted this instruction since the one I detailed below is clearer.


Hope this helps and good luck.
 
Last edited:
more info

more info

it runs at times but just won't run right. the directions said to use the washer only with newer models. I also said to hook up white to white black to black and the 12 volt wire to the orange wire of the coils. My problem is trying to figure out which way the plate goes at the start and which marks to start with and which marks to set at in both 1-4 and 2-3
 
I have a Dyna III installed on mine and the tricky part about installing mine was that I had to hold the mechanical advance unit fully to the right as I turned the engine with a wrench and lined up the timing marks, I dont know if this is required with the dyna s but if it is, then its possible you overlooked this step.
 
timing marks

timing marks

i guess i'm having trouble on which marks that should be used.
 
Put test light in WHITE wire firing 1-4 coil.

Turn the engine over with a 19mm wrench.

Test light should illuminate when the 1-4 F mark aligns with the mark on the crankcase.


Once you have this working, turn the engine over more until you find the mark 1/2 inch to the right of the 1-4F mark. This is the firing point when the centrifugal advance is in full advance.

Now grab the black rotor and twist it, the light should turn on when the rotor gets to the end of it's travel. Adjust as necessary.

If the rotor does not rotate freely, or pulls out and in easily, you need to adjust the end float on the rotor. That is what the washer is for (only it's not always the proper thickness, at least it wasn't on my bike).

Hope this helps.
 
Last edited:
bplubin said:
i guess i'm having trouble on which marks that should be used.
Click to expand...


The mark you need to align is on the side of the mechanical
advance assembly. |F1 is the static timing mark. Align the mark (|) with the arrow or mark on the engine case. If your bike does not have an engine case mark (and some dont), the case mark is the left edge of the 12 oclock breaker plate hold down screw head.

Connect a continuity light to the left crank trigger and rotate the breaker plate until the ight flashes on to indicate correct alignment of the trigger and rotor.

Ea
 
Just in case:

Left crank trigger, left coil and spark plugs 1,4.

Right crank trigger, right coil and spark plugs 2,3.


Earl
 
Go Mifune said:
I have a Dyna III installed on mine and the tricky part about installing mine was that I had to hold the mechanical advance unit fully to the right as I turned the engine with a wrench and lined up the timing marks, I dont know if this is required with the dyna s but if it is, then its possible you overlooked this step.
Click to expand...
Another thing to remember is that this is an ELECTRONIC ignition. So in order for it to work properly you need a well charged battery.
 
new info

new info

well i tried several things that everyone was very helpful and found that the rotor is sticking on the shaft. When i took it apart originally i found that the tabs at the end of the shaft were either worn off or stripped off. I didn't thing nothing of it. But after using all the steps everyone had stated found the rotor sticking at times i.e when in full advanced rotor was not turn the light back out quickly was staying on and m not move to turn back off. So i'm going to go to the recycle yard this morning and see if they have one I HOPE
 
Fixed at last!!!!!!

Fixed at last!!!!!!

Got back from the recycle yard found slightly rusty but operational mechanical advance . installed it and set the time. Started right up and ran great Someone that had the bike before me removed the two stops at the end of the mechanical advance and also found i was tightening too tight. Thanks for all the help.
 
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