gl1100 rpm's high between shifting


Information and questions on GL1100 Goldwings (1980-1983)
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dlpwinger
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Motorcycle: 1983 GL1100 Interstate

gl1100 rpm's high between shifting

Postby dlpwinger » Sun Jul 14, 2013 9:16 am



I need some help. My '83 gl1100 rpm speed is slow to drop down between shifting gears. In fact when I let off the throttle and squeeze the clutch it even revs up a bit and then drops real slow (makes it hard to shift unless I wait). It also idles a little rough but runs really smooth at road speeds. I've adjusted the valves clearance and snyc'ed the carbs to within 0.5", new plugs also. Any ideas what to check next. I don't know how to time the ignition so need help on that also if that could be the prob. Thanks.



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Fulcrum
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Re: gl1100 rpm's high between shifting

Postby Fulcrum » Sun Jul 14, 2013 1:31 pm

Let me see if I understand you correctly. If you are cruising down the road say in third gear and you twist back the throttle and then pull the clutch lever the RPM jump up? If so I would check to see where my iddle setting is first and if it has a tendency of high revving and holding high RPM in neutral when revving it.

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virgilmobile
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Re: gl1100 rpm's high between shifting

Postby virgilmobile » Mon Jul 15, 2013 9:16 am

With a mirror in the plunum,check the slide operation.Are they sticking open or dragging.
They should snap shut after a quick rap of the throttle.

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SteveB123
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Re: gl1100 rpm's high between shifting

Postby SteveB123 » Mon Jul 15, 2013 4:41 pm

If the slides where stuck, I'd expect the revs would drop like a stone, as it would be super rich.

Makes sure the throtle plates actually move, no, makes sure they actually SNAP back when you release the throttle grip.
I'd wager something is binding.
Current:82 GL1100 Interstate, 60 Amp Poorboy, MSD coil
Previous: 93 GSX1100F Katana
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dlpwinger
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Motorcycle: 1983 GL1100 Interstate

Re: gl1100 rpm's high between shifting

Postby dlpwinger » Mon Jul 15, 2013 5:21 pm

Ok, I'll check the slides and plates and whatever else I can without removing the carbs. What's peculiar is it only seems to throttle down slowly when I'm riding, in the garage on the stand it seem quicker to slow down after releasing the throttle. Is there some relationship to the throttle position and driving at road speeds that isn't there when its parked and I rev it up in the garage? Hmmm??? Thanks for the advice.

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Johnyy Smoke
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Re: gl1100 rpm's high between shifting

Postby Johnyy Smoke » Mon Jul 15, 2013 6:44 pm

Clean the carbs-sounds like they are gummed up. Rebuild or replace- your option .Pleanty of diy articles to address this prob. A simple search would have found results. Regards, Johnyy

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virgilmobile
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Re: gl1100 rpm's high between shifting

Postby virgilmobile » Tue Jul 16, 2013 9:22 am

If the slides are stuck down it would run lean.stuck up it will run rich.
I wonder about the air cutoff valve too.

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dingdong
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Re: gl1100 rpm's high between shifting

Postby dingdong » Thu Jul 18, 2013 7:10 am

virgilmobile wrote:If the slides are stuck down it would run lean.stuck up it will run rich.
I wonder about the air cutoff valve too.


+1 on the air cutoff valve.
Tom

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Fred Camper
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Re: gl1100 rpm's high between shifting

Postby Fred Camper » Thu Aug 01, 2013 7:15 pm

Off topic, but so glad to see dingdong is the big site winner this month. Well deserved.

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echinus1988
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Re: gl1100 rpm's high between shifting

Postby echinus1988 » Sun Jul 19, 2015 6:28 pm

I am experiencing the same problem.

A 1982 GL1100 Aspenscade. I bought the Randakk kit to rebuild the carbs since the bike had been sitting for years. Put it back together and set low speed jets and synced the carbs. Other than the rpms revving when I pull in the clutch and the inability to idle when the engine is cold, it runs great. When I pull out the idle, the bike starts and revs up to 4,000+ rpms. I push it in slowly in increments because if I try to drop it too fast, the engine dies. Lastly, at higher rpms (roughly 4,000 and above) if I put on full throttle, the engine begins missing until I back down or downshift.

While I am riding, when I pull in the clutch the RPMs go up. They will not slow unless I reach down and physically push the throttle linkage so the rpms come down. My son feels I have a vaccuum leak but I don't know. I am getting starter fluid to test his theory. Is that a good thought, a leak in the carb or runner causing the rpm's to drop slower or stay up?

Thanks for the help.
Steve

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Re: gl1100 rpm's high between shifting

Postby 4wred » Mon Jul 20, 2015 6:43 am

You said if you physically push down on the linkage the rpm's drop,are your cables binding or frayed?? I have heard of vacuum leaks also causing that problem.Keep after it you'll find the problem sooner or later!!

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maintainer
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Re: gl1100 rpm's high between shifting

Postby maintainer » Mon Jul 20, 2015 10:59 am

The 1100 has both a push and a pull throttle cable. I would start there, they're cheap online. If they are ok, check actual throttle linkage (on the carb rack) for and interference and freedom of movement (snap back) to the idle stop with the cables disconnected.
Last edited by maintainer on Mon Jul 20, 2015 1:39 pm, edited 1 time in total.
1982 GL 1100 Interstate SOLD
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bigbugshurt
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Re: gl1100 rpm's high between shifting

Postby bigbugshurt » Mon Jul 20, 2015 11:59 am

I had that prob with my 1100. It went away after another carb sync. You might try a carb sync with the idle screw set at about 2000 rpm, and then idle it back down a little. The linkages and shafts wear, and a true sync at idle, may not be a true sync at throttle...it may not idle perfect at that point....but, might run better.
Also, if your vacuum advance has a leaking diaphragm, it may cause a false vacuum reading during sync-might try plugging, then sync.....?

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Re: gl1100 rpm's high between shifting

Postby WingAdmin » Mon Jul 20, 2015 12:43 pm

If you are rotating the throttle closed on the grip, and in order to get the RPMs down you have to push the linkage on the throttle body with your finger, then you have either a broken push cable, or it's severely maladjusted - and in either case, you probably have a frayed pull cable, as the throttle body return spring should be more than strong enough to pull the twist grip closed.

I would recommend just replacing both push and pull cables (they're relatively cheap, can be found even on Amazon) and see if it fixes it. See: How to replace your throttle cables

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echinus1988
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Re: gl1100 rpm's high between shifting

Postby echinus1988 » Mon Jul 20, 2015 6:56 pm

I need to be a lot clearer. All points have validity based on what I said. I try to be complete.

RPMs don't come down like they should. I close the throttle and the rpms drop very slowly or they stop at about 3000 rpms. If I push on the throttle, it doesn't actually move but the rpms will start dropping. But the throttle appears to be all the way down.

It could be cables but I don't think so and neither does my son. I can push on the throttle and it won't always drop.

I'll look for cables and I'll try adjusting them better. My son watched as I manipulated the cables and he didn't feel there was a problem. They appear to close like they should.

It's always so difficult to diagnose over the Internet. I appreciate all the suggestions.

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spiralout
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Re: gl1100 rpm's high between shifting

Postby spiralout » Wed Jul 22, 2015 2:22 am

echinus1988 wrote:I am experiencing the same problem.

When I pull out the idle, the bike starts and revs up to 4,000+ rpms. I push it in slowly in increments because if I try to drop it too fast, the engine dies.
Steve

What idle are you pushing and pulling? The choke?

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echinus1988
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Re: gl1100 rpm's high between shifting

Postby echinus1988 » Wed Jul 22, 2015 3:31 pm

Yes, I meant the choke. I hate being sick, slows the thinking process. I did mean the choke.

sw3dl1
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Re: gl1100 rpm's high between shifting

Postby sw3dl1 » Sat Aug 01, 2015 4:52 pm

I believe I would start looking for a vacuum leak. If the bike is not returning to idle when letting go of the throttle it's sucking aie form some place. I'd start with the intake manifolds at the motor and at the carbs. Pretty easy procedure, some folks use a can of carb cleaner and spray directly in the area you suspect to be leaking, of you get a RPM fluctuation, congrats, you found your leak. Now go fix it!

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echinus1988
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Re: gl1100 rpm's high between shifting

Postby echinus1988 » Mon Aug 03, 2015 8:48 am

1982 GL1100 Aspencade
Rebuilt carbs using Randakks kit.

Still having two problems. Found vaccuum leaks on 2 of the 4 intake runners. Applied a small bead of silicone seal around the base and sealed the rubber part also. No more leaks there.

I still cannot get a smooth idle, rpm's still increase when I pull in the clutch and I cannot set my idle speed.

I have to be missing something but for the life of me I cannot figure out what. This is my second carb rebuild and the first one went smooth and that bike still runs like a champ (1980 GL1100 Goldwing) except for overheating. I am going to remove the radiator and have it cleaned and replace the thermostat switch once more.

Back to the 1982, sorry I sidetrack. The idle speed will adjust down to proper speed (around 1000) and at the first light will be running back at 3300-3500 rpm. I adjust it down and it will either drop down too low or will be back up. It just will not sit at the speed I set it will either idle too low and die or race. I have tried making small adjustments and moved it as needed in small increments hoping it would set right but no luck. Last night, it kept wanting to die so I adjusted it up slowly until I had 1000 and took it out to test it. 2 blocks away at a stop sign I was running 3300 rpm. Got to my destination, took it down slowly to 1000 rpm and 5 minutes after leaving it was trying to die at every intersection.

Trying to shift is a pain. The rpm's drop very slowly, if at all. Usually they are running about 500 rpm faster than my engine speed so I pull in the clutch and the engine speeds up. I have tried synchronizing and it doesn't seem to help. I rev and let go, it comes down very slowly. Not the immediate drop I keep expecting.

Talking about synchronizing, the mercury sits almost at the bottom of the tool. I actually have to increase speed to get it up so I can read it accurately because it's sitting so far down I can't see all 4 tubes. This says I am missing something that is losing vaccuum but I just don't know where to look anymore.

I have replaced the hose from the pulse generator already so that shouldn't be an issue, I hope. New fuel lines and clamps. New fuel filter.

I know I sort of dragged on but I am trying to give necessary information because diagnosing online is difficult to say the best. Without the information needed, it is impossible. I hope this is enough to give everyone a good idea of what is going on.

Thanks in advance.
Steve

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Re: gl1100 rpm's high between shifting

Postby sw3dl1 » Mon Aug 03, 2015 9:43 am

I don't believe there is a problem with your clutch or transmission, (i.e. engine revs when the clutch is pulled in) i think that symptom is part of then carb problem. Usually when gears are shifted, the throttle is rolled back when the clutch is pulled in. If that is the case, it is the same as twisting the throttle and letting it go and the RPMs do not immediately return to idle when the bike is in nuetral.
The idle problem you are describing is classic vacuum leak. It is drawing air from some place. The extra air creats a lean idle condition which makes the bike idle faster. There will be no amount of idle adjustment on your setup that will cure this condition.
If there are no vacuum leaks that you can find from the outside, start checking the vacuum slides on the inside of the carbs, you may have a torn rubber boot in one of them. Another place to look is the very small rubber o-rings that are in th air-idle needle adjustment screws.
It's sucking air form someplace, you just have to find it.

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spiralout
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Re: gl1100 rpm's high between shifting

Postby spiralout » Mon Aug 03, 2015 12:23 pm

How, exactly are you trying to adjust the idle? You said before you were using the lever on the bars.

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echinus1988
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Re: gl1100 rpm's high between shifting

Postby echinus1988 » Tue Aug 04, 2015 6:51 pm

I'll answer in the opposite order.

I'm using the idle adjust screw to set the idle but it doesn't do any good. It's either too fast or too slow. I can't get it to settle.

As far as the air leak, I need to learn to listen to my son. He already said that so I was checking runners to see if that was the leak and yes, there were leaks in 3 and 4. I reseated those but still had leaks so I took them totally apart and tried again. I must have something not quite right because I finally resorted to using a silicone gasket inside the rubber part of the runner and a very thin bead around the bottom. That cured those leaks but it's obvious now that I have more.

I'm about ready to pull the 1980 Goldwing carbs and use those while I work on the 82 but my son is too anxious to get the 1980!

I'll start pulling things apart this weekend and check carefully the slides and make sure there are no tears.

Anyone have a good product that will flush out a radiator? My 1980 starts heating up anytime it's hot or I work the engine hard. Since I live right near the mountains that is fairly normal. I replaced my thermostat switch with a used one, two bad ones! So I now have a switch on it. Even when I run the switch, unless it's cool outside, the engine heats up. Gets into the high operating range if not up to the red. I am thinking of buying the one I saw mentioned in another post, it runs in the 200-210 range I believe.

Last, I have running lights on light bars around the back. I would like to look for LED to replace and drop the amperage. How do I tell if I need to add a resistor to the circuit?

Thanks again for all the help.

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Johnyy Smoke
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Re: gl1100 rpm's high between shifting

Postby Johnyy Smoke » Tue Aug 04, 2015 7:08 pm

I picked up a radiator core (used) on e-bay for $35, fixed my overheating problems.
I tried flushing my old radiator, etc , with no luck.
Got to be something up in the carbs as you have said, about the only thing you can do is to tear into them and go over em with a fine toothed comb.
Vacuum leak is most likely cause.
There is a lot of free info on Randacks web site on carb issues.
Best of luck! Regards, Johnny




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