overheating or wrong temp?


Information and questions on GL1000 Goldwings (1975-1979)
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patsinterstate81
Posts: 47
Joined: Tue Jun 11, 2019 8:45 pm
Location: knoxville TN
Motorcycle: 1975 gl1000
1981 gl1100i

overheating or wrong temp?

Post by patsinterstate81 »



Hello Everyone,
I am trying to synch the freshly rebuilt carbs on my "75 GL1000 (she sat in a garage for 20 years).
However, after burping the radiator and settling into a stable idle the temp gauge goes all the way to the right hot pretty quickly (3-4 mins).
The Fan does not come on.
I double-checked the thermostat, fan thermo-switch on a stove in hot coolant and it's within specs, however, shorting the ground from the thermo-switch turns the fan on.
I'm afraid to overheat the engine.
What am I missing here?

Thanks.


1981 Gl1100 interstate, naked
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Rambozo
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Re: overheating or wrong temp?

Post by Rambozo »

Check the gauge sender with your hot water setup. You can check the temps of various parts of the cooling system with a thermometer or an IR temp gun. Are you getting good flow from the water pump?
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DenverWinger
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Re: overheating or wrong temp?

Post by DenverWinger »

Might have a bad 7 volt Regulator -putting out 12 volts. This will cause the temp gauge to read far hotter than the engine actually is. A quick way to tell is the fuel gauge will also indicate far more fuel than is in the tank.

Replacement regulators are sold on this site.
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patsinterstate81
Posts: 47
Joined: Tue Jun 11, 2019 8:45 pm
Location: knoxville TN
Motorcycle: 1975 gl1000
1981 gl1100i

Re: overheating or wrong temp?

Post by patsinterstate81 »

Where is the gauge sender located?
I don't have an IR thermometer.

How to check for good flow?

The manual says you can connect the gauge to the temp sender in a hot bath compare the values.
Can I open the speedo to get to the gauge?

It's got the original regulator and puts out 7 volt. A new one is on the way anyway.
1981 Gl1100 interstate, naked
patsinterstate81
Posts: 47
Joined: Tue Jun 11, 2019 8:45 pm
Location: knoxville TN
Motorcycle: 1975 gl1000
1981 gl1100i

Re: overheating or wrong temp?

Post by patsinterstate81 »

Ah, found it and remembered the reason why I didn't replace it. It did not move since it's been sitting in there since 1975.

Looks like it's time to take it all apart again :oops:
1981 Gl1100 interstate, naked
patsinterstate81
Posts: 47
Joined: Tue Jun 11, 2019 8:45 pm
Location: knoxville TN
Motorcycle: 1975 gl1000
1981 gl1100i

Re: overheating or wrong temp?

Post by patsinterstate81 »

I think the voltage regulator was the culprit.
Installed the new one I ordered here, new temp sending unit, new temp switch and cleaned all contacts.
It's not showing overheating any more, temp stays below the middle and even the fan came on.

The header on # is just warm, water pearls off instead of instantly evaporating like on the others.
Had a loose ignition wire there but rethreaded the cap, still only warm.

Old spark plug?
How to test more?

Thanks!
1981 Gl1100 interstate, naked
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winguyjo
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Re: overheating or wrong temp?

Post by winguyjo »

you could try swapping spark plugs with one of the good running cylinders and see if the problem moves. also, you could check for fuel in the bowl of the poorly running cylinder by opening the bowl drain screw.
patsinterstate81
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1981 gl1100i

Re: overheating or wrong temp?

Post by patsinterstate81 »

New spark plugs today, has spark and fuel coming out of the #bowl.
The header is still just warm.

:?
1981 Gl1100 interstate, naked
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LAB3
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Re: overheating or wrong temp?

Post by LAB3 »

You might want to check the spark plug cap resistance, it's pretty common for those to go bad over the years.
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MattMcCoy
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Motorcycle: 1983 GL1100A Aspencade

Re: overheating or wrong temp?

Post by MattMcCoy »

If you have good spark, I would lean towards a dirty idle circuit. You might give this a try:

https://www.motorcycleproject.com/text/ ... _bike.html
patsinterstate81
Posts: 47
Joined: Tue Jun 11, 2019 8:45 pm
Location: knoxville TN
Motorcycle: 1975 gl1000
1981 gl1100i

Re: overheating or wrong temp?

Post by patsinterstate81 »

Thanks guys,
Checked resistance across the coils, all good.
Pulled the idle needles and cleaned.

According to the Mike Nixon carb rebuild instructions, I've had the idle screws 3 turns out.
According to Randakk's it's only 1 3/8 out , which I've tried today and went for a 40 mile drive.
Photo shows the plugs after the drive.

She runs nice on the road. Doesn't idle well and the # 2 cylinder header is only warm.

The fairing doesn't look nice on the bike. I think it's too big. It is nice to be protected from the cold wind though, but riding into the sun you see all the scratches on it.
I wonder if there is smaller fairing for this bike.

Pulling the carbs out for another cleaning. :cry:
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1981 Gl1100 interstate, naked
patsinterstate81
Posts: 47
Joined: Tue Jun 11, 2019 8:45 pm
Location: knoxville TN
Motorcycle: 1975 gl1000
1981 gl1100i

Re: overheating or wrong temp?

Post by patsinterstate81 »

Fairing photos and spark plugs.
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1981 Gl1100 interstate, naked
MattMcCoy
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Re: overheating or wrong temp?

Post by MattMcCoy »

From the pic of the spark plugs, it looks like one cylinder is running rich. How’s compression and did you double-check float height and the rubber tip on the float needle?
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dingdong
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Re: overheating or wrong temp?

Post by dingdong »

Three plugs look way too lean and the other one is way too rich. Regarding "40 mile ride". Keep in mind that the idle screws adjust the idle only and not the off idle circuits. My first thoughts are float height adjustments are off.
patsinterstate81
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Location: knoxville TN
Motorcycle: 1975 gl1000
1981 gl1100i

Re: overheating or wrong temp?

Post by patsinterstate81 »

Double checked float height, rubber tip and did not find anything plugged up or dirty.
However, this is the carb that has a plug in the passage shown in the photo, the other ones do not have this.

Compression is 140 psi for #1 and #2, 135 psi for #3 and #4.
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1981 Gl1100 interstate, naked
patsinterstate81
Posts: 47
Joined: Tue Jun 11, 2019 8:45 pm
Location: knoxville TN
Motorcycle: 1975 gl1000
1981 gl1100i

Re: overheating or wrong temp?

Post by patsinterstate81 »

dingdong wrote: Sun Nov 07, 2021 9:14 am Three plugs look way too lean and the other one is way too rich. Regarding "40 mile ride". Keep in mind that the idle screws adjust the idle only and not the off idle circuits. My first thoughts are float height adjustments are off.
What could be the reason for the lean and rich difference? I checked the float heights and they are spot on.
1981 Gl1100 interstate, naked
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dingdong
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Re: overheating or wrong temp?

Post by dingdong »

Too rich/lean is usually a carb problem. Can you elaborate on the carb rebuild. Did you just clean, and how did you clean, or did you replace all of the rubber gaskets and seals. Too lean could be a vacuum leak or leaks. Have you checked for vacuum leaks? Did you replace the orings between the runners and heads. I doubt there is anyone who has done a carb rebuild on a gl1000 and got it right on the first try. Oh! You said she runs fine on the highway but that the runner on the one cylinder is cool. One doesn't go with the other. ???
patsinterstate81
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Motorcycle: 1975 gl1000
1981 gl1100i

Re: overheating or wrong temp?

Post by patsinterstate81 »

Hi, I used a Randakks rebuild kit with video and the book written by Mike Nixon. I did the vacuum leak testing according to Randakks instructions.
Checked all the jets per table for right size. Purchased new emulsion pipes from Mr. Nixon and new needles, seats and filter cups, vacuum and fuel hoses with fuel filter from wingovations.

The previous owner died and she was stored in his machine shop. Last registered 1985. Unfortunately fuel was left in there and congealed down to a molasses substance.
Had to thoroughly clean the tank and carb parts. MEK, Acetone and Muriatic acid to get the fuel tank clean.
Simple green warm bath in an ultrasonic cleaner, followed by a greased lightning bath and some berryman spray & carb cleaner for small orifices.
Cleaned all the water ways, new water pump and seal kit and rebuild the fuel pump.
New head gaskets and o-rings. Checked the valve springs and did a valve and head cleaning plus valve seat grinding followed by valve lash adjustment.
New o-rings on the runners.
Idle fuel mixture screw three turns out.
I used the old plugs first and they came out light brown. Funny that the new ones showed the lean/rich pattern. All I changed was the idle mix 1 3/8 out.

I didn't expect it to get right the first time but was surprised that she started right up without and any mis-firing or sputtering like the 81 gl1100 did.
I pulled and cleaned the 81 carb three times before she ran right.

The resistance across the coils checked out ok. I left the points as is. I still have to learn how to adjust these and I am leaning toward purchasing new coils and a dyna ignition.
1981 Gl1100 interstate, naked
MattMcCoy
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Re: overheating or wrong temp?

Post by MattMcCoy »

Are the needles and seats OEM?

Just curious — what’s the gap on both sets of plugs and were the originals resistor plugs too?
patsinterstate81
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Motorcycle: 1975 gl1000
1981 gl1100i

Re: overheating or wrong temp?

Post by patsinterstate81 »

Hi Matt,
No, the needles and seats he sent were not OEM, but he said those were the best aftermarket specimen he stocks.
I did not use the original plugs (they did not have resistors in it) but an aftermarket NGK with resistors that I stole off of my 81.
I used the book values for the plugs (0.6-0.7mm or 0.024-0.028 in).
1981 Gl1100 interstate, naked
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Brendan65
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Motorcycle: 1979 GL1000
2004 GL1800A

Re: overheating or wrong temp?

Post by Brendan65 »

For what it's worth, I was having similar problems and my plugs looked like yours.
I didn't figure it out until I bench tested the carbs, and found I had fuel leaking from the #3 carb.
The gas ran into the #3 cylinder but also into the plenum which eventually filled enough to flow back out to all the carbs.
patsinterstate81
Posts: 47
Joined: Tue Jun 11, 2019 8:45 pm
Location: knoxville TN
Motorcycle: 1975 gl1000
1981 gl1100i

Re: overheating or wrong temp?

Post by patsinterstate81 »

How did you bench test the carburetor?

I spent some time going through the carburetor again and especially checking the float heights.
It was a little off but not by much. Mostly the little clip that allows the bowl to drop was way off.

Installed the carb again today and I have the same situation. The #2 header barely gets warm.


I had some problems before when letting go of the throttle, it would not return to idle instead stay at 3500 rpm.
This time I made sure that the throttle cables are moving freely and that the spring returns making the "clack" sound.
But after firing it up and playing with the throttle, it did not go back to idle and stayed at 3000 rpm again until I pulled on the connecting rods to get it back to idle.

What is going on?
1981 Gl1100 interstate, naked
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Brendan65
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Re: overheating or wrong temp?

Post by Brendan65 »

patsinterstate81 wrote: Fri Nov 12, 2021 7:58 pm How did you bench test the carburetor?
I set it up with a fuel line, pop bottle and step ladder :


Can't help with the idle .. sticking slides ? Sticky cable ?
patsinterstate81
Posts: 47
Joined: Tue Jun 11, 2019 8:45 pm
Location: knoxville TN
Motorcycle: 1975 gl1000
1981 gl1100i

Re: overheating or wrong temp?

Post by patsinterstate81 »

Cables are brand new and I polished the slides.
Problem is, when it snaps back to idle, it's not at idle. I have to pull on the connecting rods to close the butterflies to idle.

Meanwhile, trying to get some riding time in, I installed a 1983 Gl1100 carburetor that I had rebuilt last year and it worked well on my 81 (yes, I've read Randakks carb matching article).
It idles well and revs up much better from idle, no more stumble and all headers are hot.
But it leaks fuel at #3. :twisted:
Had to pull that again to investigate.
The 1100 carbs are much harder to install in the 1000. Had to take the right top caps off and slide from the left. There is also much less space to get the throttle cables tightened up
and the vacuum advance obviously has to be plugged.
I wonder what else this carb needs to run decent on the 1000?

I thought I could use this set up for a while until I can figure out why the gl1000 carb doesn't fully snap back but no luck.

Getting tired of carb installs.


1981 Gl1100 interstate, naked
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