1985 Aspencade only running on 2 cylinders after stator


Information and questions on GL1200 Goldwings (1984-1987)
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gsbuilder
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Motorcycle: 1985 GL1200 Aspencade

1985 Aspencade only running on 2 cylinders after stator

Postby gsbuilder » Mon Apr 25, 2011 7:22 pm



I just finished replacing the stator in my 1985 GL1200A, and cleaned the carbs at the same time. Now it only starts and runs on cylinders 1&4, 2-3 are not firing. The plugs are new as well. I checked the spark plug wires and they are not switched, if I'm correct that 1 coil fires 1&2 and the other coil 3&4. Any help would be appreciated. Thank you



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WingAdmin
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Re: 1985 Aspencade only running on 2 cylinders after stator

Postby WingAdmin » Tue Apr 26, 2011 8:28 am

What you're describing is not possible.

On Goldwings, as you mentioned, each coil fires two plugs:

Goldwing coil wiring
Goldwing coil wiring


It uses what is called "wasted spark". The right coil has its primary coil which induces a high voltage in its secondary coil. Each end of secondary coil connects to one plug: plugs 1 and 2. The spark travels from ground, across plug 2, through the coil, across plug 1, and back to ground. When plug 1 fires, plug 2 fires. The reason it's called "wasted spark" is because one of those pair of plugs is always firing during its exhaust cycle, which doesn't do anything, so that spark is wasted. It means that the bike can get away with two coils & associated firing/timing circuitry, instead of four.

You're saying plugs 2 and 3 are not firing. If this were the case, then by definition plugs 1 and 4 would not be firing, either. The fact that plugs 1 and 4 ARE firing, means that 2 and 3 are also firing - so if you are not getting power from cylinders 2 and 3, then the problem is not spark.

A simple way to confirm this is to remove the plug wires from cylinders 2 and 3. This will cause the engine to not start or run at all, as plugs 1 and 4 will not be able to spark.

IF you remove the plug wires from cylinders 2 and 3, and cylinders 1 and 4 continue to spark and run, then you have got plug wires mixed up.

gsbuilder
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Location: West St Paul
Motorcycle: 1985 GL1200 Aspencade

Re: 1985 Aspencade only running on 2 cylinders after stator

Postby gsbuilder » Tue Apr 26, 2011 8:39 am

They are not FIRING, they are SPARKING however. There is no ignition of the fuel-air mixture. I'm going to pull the carbs back off and see if I missed something in there.

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Re: 1985 Aspencade only running on 2 cylinders after stator

Postby virgilmobile » Tue Apr 26, 2011 8:46 am

First thing is to identify the cylinder number (See the pix in the previous post) then pull all the plugs.Attach all the plugs to the wires and lay them on the engine.Crank the engine over and look at each plug for a crisp spark.Lets narrow down why the cylinders don't fire.It's spark,fuel,compression.All at the right time.Look and smell each plug for condition,eg:gas soaked,sooted black,light tan.and which cylinder each came out of.A weak spark can be just a poor battery.

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Re: 1985 Aspencade only running on 2 cylinders after stator

Postby stever » Tue May 31, 2011 5:17 am

Make sure you don't have the washer that between the timming belts backwards, it has an F stamp on it that has to face out.




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