constant spark

[jd3d]

I just bought a 78 GS550 that already had the Dyna S e ignition on it. Put a new battery in and when I turn the ignition on I get what sounds like a power arc inside the motor and I get constant spark on 2 and 3

[JEEPRUSTY]

You have a question?

[JEEPRUSTY]

If you mean it is sparking on both the power and exhaust strokes then it is a wasted spark ignition system I think.

[posplayr]

Did you install the Van de graaf version of the dyna s?

[Big T]

I just bought a 78 GS550 that already had the Dyna S e ignition on it. Put a new battery in and when I turn the ignition on I get what sounds like a power arc inside the motor and I get constant spark on 2 and 3

Seeing as this is your 1st post, a few hints

You need a through explanation of your symptom and questions, we're not mind readers

You have been BassCliffed

http://www.thegsresources.com/_forum/showthread.php?t=196338

Are you getting this only on 2-3, what about 1-4?

[OldVet66]

It's more likely you get a spark when you turn the ignition switch off, igniting whatever fumes are left in the cylinders causing a chuffing sound. It's perfectly normal for a Dyna-s, but might make you jump every now and again.

[jd3d]

OK The spark is just a constant arc across the plug electrodes on 2 and 3 after I turn on the ignition. When I crank the motor over the spark stops. Both 1 and 4 have good intermittent spark. I have ordered new coils not sure if that will solve the issue since 2 and 3 run off the same coil. I do not know if it is the Vande de Graff as the Dyna S was on the bike when I bought it. If you have any other resolutions I would appreciate them. Did find out from Dyna Tek that you cannot have a battery charger hooked to the battery or you do get the constant spark. I have disconnected the charger and still get the symptoms I have stated above. So really just looking for solutions as to why I get the constant spark out of 2 and 3.

[koolaid_kid]

The coils only fire when the ignitor tells them to. The ignitor only tells the coils to fire when the signal generator tells it that it is time to fire.
On the Dyna S, both are built into the one piece, which resides on the right end of your crankshaft.
In other words, it sounds like your Dyna S is faulty.

[posplayr]

The coils only fire when the ignitor tells them to. The ignitor only tells the coils to fire when the signal generator tells it that it is time to fire.
On the Dyna S, both are built into the one piece, which resides on the right end of your crankshaft.
In other words, it sounds like your Dyna S is faulty.

Apparently a known feature.

[MisterCinders]

Apparently a known feature.

Yeah. Hook a static timing light to that ignition wire (black IIRC). Turn motor. If the light stays on the whole time you have a bad Dyna.

[posplayr]

Yeah. Hook a static timing light to that ignition wire (black IIRC). Turn motor. If the light stays on the whole time you have a bad Dyna.

Quoting OP

Did find out from Dyna Tek that you cannot have a battery charger hooked to the battery or you do get the constant spark.

[OldVet66]

I run a battery tender all winter without a problem with my Dyna-s.

[lemonshindig]

Did find out from Dyna Tek that you cannot have a battery charger hooked to the battery or you do get the constant spark.

No... If that's what someone told you, they lied.

[BigD_83]

Did find out from Dyna Tek that you cannot have a battery charger hooked to the battery or you do get the constant spark.

I am trying to wrap my head around how that could possibly affect the generation of the signal from the Dyna S...I'd want more info from DyanTek about that nugget

[posplayr]

I am trying to wrap my head around how that could possibly affect the generation of the signal from the Dyna S...I'd want more info from DyanTek about that nugget

if a dirty charger caused conducted emissions that cause the pickup sense circuits to misfire.; Bad design if so.