83 GL1100 killing plugs. Why?


Information and questions on GL1100 Goldwings (1980-1983)
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odin70
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Motorcycle: 1983 gl1100

83 GL1100 killing plugs. Why?

Postby odin70 » Tue Jul 20, 2010 6:17 pm



Hi, I have a 83 gl1100 that runs fine for a while, and then the plugs begin to fail. One by one. I put in new plugs, and shes running fine again, for a while :-( 20 min to an hour or so. first goes 4, then 3 and at this point I cant drive her anymore. So I really never checked out if nr 1 and 2 would get fouled the same way. Start out at low rpm, later on it wont fire at higher rpm either. The plugs that stopped working are black with carbon deposits, but the plug still working are looking good. Carbs are cleaned and synced, compression is good, plugs just goes black and then they stop working. Any ideas on what I should check first and how.

Odin, one frustrated norwegean



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MJSantos
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Re: 83 GL1100 killing plugs. Why?

Postby MJSantos » Tue Jul 20, 2010 7:01 pm

First instinct is that the spark is weak, possibly a coil going bad as it heats up or a connection to the coils dirty. I'd check the connections first. Check this thread out even though it's for a 1200 it basically the same
viewtopic.php?f=5&t=3060&start=0

odin70
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Location: Flora
Motorcycle: 1983 gl1100

Re: 83 GL1100 killing plugs. Why?

Postby odin70 » Wed Jul 21, 2010 6:13 am

Ok, I have gone over all the connections and cleaned them. The bike is operating fine for now under idle and all rpm's. But it is ofcourse new plugs in now so I wont know for sure before I have been going for a longer ride. But it is raining like @3$4 here now :evil: Question: Will a strobe test lamp blink if the plug don't work but coil is fine?

Odin

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WingAdmin
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Re: 83 GL1100 killing plugs. Why?

Postby WingAdmin » Wed Jul 21, 2010 3:22 pm

If the plug doesn't fire, there is no electricity flowing, and it normally will not activate an inductive pickup strobe light. The plug has to fire (spark) in order for current to flow through the wire, which is what the inductive pickup detects.

You might want to also have a look at the plug condition pictures on this thread: How to remove, analyze, gap and replace your spark plugs

odin70
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Location: Flora
Motorcycle: 1983 gl1100

Re: 83 GL1100 killing plugs. Why?

Postby odin70 » Thu Jul 22, 2010 7:53 pm

Ok, today I drove 130 km. It started to miss after about 50 km, especially at low rpm and when I gave it some throttle to increase the speed from low rpm on high gear. I am currently braking it in after a burned crank. Changed bearings, crank and one rod and pistonrings. So I have been taking it very easy on the road. Can this be the reason? That driving over long period with low rpm and "resistance" on the engine, have fouled the plugs with carbon deposit? Because, after I noticed the misfiring this time, I increased the average rpm to about 3000-3200 rpm, and generally drove it a little bit harder, and the misfiring disappeared. It is running fine now. Is the mix to rich for low rpm? Or is the spark to weak on 3 and 4, but is strong enough with higher rpm? only nr 3 and 4 are fouled.

Odin

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mortiki
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Re: 83 GL1100 killing plugs. Why?

Postby mortiki » Wed Aug 11, 2010 1:12 am

I would say your on the right track. These are not CX motors. They really like it between 3000 and 5000 RPM's. Under that and you will foul plugs. 3 and 4 are secondary cylinders and probably will show the affects a lot sooner. I do not think they are secondary enough with all things equal but combine that with possible a weaker spark and first in line for fuel and that would lead to fouling first. Too bad you did not just replace 3 and 4 plugs, then you would have found out if 1 and 2 would eventually foul. Keep the RPM's up and you should be good.
There is never enough time to do it right but there is always time to do it over.
Edmond Burke "The only thing necessary for the advancement of evil is for good men to do nothing".

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littlebeaver
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Re: 83 GL1100 killing plugs. Why?

Postby littlebeaver » Wed Sep 15, 2010 12:05 am

Maybe the negitive side of the battery is not grounding out good enough, clean up those washers or replace, at the frame and tighten that bolt and inspect the battery wires ...

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RBGERSON
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Re: 83 GL1100 killing plugs. Why?

Postby RBGERSON » Thu Sep 16, 2010 7:26 am

While running at low rpm's isn't what these bikes like it should run Ok and not foul plugs at 2500. I think you've other issues like bad/weak coils. both 2 and 4 are on the same one..swap the coils and see if the problem follows the swap. You could swap the wires if you change the whole system over at the ignition and spark wires ..easier if you know what you are doing. Inspect the coil for cracks, bubbles leaks etc. and wiring for shorts, breaks, corrosion.

Note these bikes run at idle just fine..950 RPM's until they heat up..and then a fan blowing on them will fix that. They are beasts and will run forever if treated right. Note at idle the plugs may get a perfect tan color but they won't foul up if all is right with the bike.


HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB


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