85 gl1200 will not go over 50 mph


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Poohman
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1998 GL1500 SE

85 gl1200 will not go over 50 mph

Postby Poohman » Tue Jun 05, 2012 7:31 pm



Ok My 85 wing will not go over 50 mph at full thottle in OD. I have replaced the Slider diaphrams and the front two were ripped and the had a piece of black tape on both sides. The piece of tape was about 1/2" Sqare on both sides. So I did replace the Rubber Diaphrams on all four carbs and it did not seem to help. It barely spudders in 1rst then smooths out and it run good in 2,3 and 4h gear, But when hitting OD that is when it seems to spudder and not go over 50 to 52 mph. What else can I check to find the problem. I dont have much money now that The Crappy Bike Shop JIM WALKERS OF DAYTONA took me for. I can use all the help I can get. I really like this Goldwing and would really like to get it fixed so i do not have to take my wife and friends advise and sell it. :(



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WingAdmin
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Re: 85 gl1200 will not go over 50 mph

Postby WingAdmin » Wed Jun 06, 2012 9:04 am

First thing I would do is change the fuel filter. If it is clogged, it may not be able to flow enough fuel to get you above that speed.

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Poohman
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Re: 85 gl1200 will not go over 50 mph

Postby Poohman » Wed Jun 06, 2012 11:08 am

There is a new filter on it as with new plugs, wires, fuel pump and Coils.

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Poohman
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Re: 85 gl1200 will not go over 50 mph

Postby Poohman » Wed Jun 06, 2012 11:33 am

Oh yeh also when I put on the Choke it does not rev up like it use to. It does not get over 2200-3000 rpms. When it was running right when the choke was on it revd up like it was full thottle.

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noycebj
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Re: 85 gl1200 will not go over 50 mph

Postby noycebj » Wed Jun 06, 2012 1:35 pm

I had the same issue to an extent. I pulled my air filter and ran unfiltered air to see if there were any restrictions. Also you may look in the air box for any debris that would prevent air, especially around the screens.

When you replaced the diaphragms, did you happen to check/clean the needles tip? I had the same issue, 2 of 4 had black tape with red RTV (crappiest job ever) as a patch. I inspected the needle tips and they too had deposits, almost like a calcium buildup, just scraped them off and it ran a whole lot better. You may have to pull the carbs and check them out; floats, jets, just to see that there is no debris/and or lacquer buildup in the bowls, jets, etc.

Good luck and keep us posted. I've got a similar restoration project going.

Ben

rcgreg
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Re: 85 gl1200 will not go over 50 mph

Postby rcgreg » Thu Jun 07, 2012 9:24 am

Run a quarter can of seafoam in a full tank pf gas - it will clean your needles in the carb - sounds like a fuel restriction problem - have you checked the fuel lines for leaks of air?

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noycebj
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Re: 85 gl1200 will not go over 50 mph

Postby noycebj » Thu Jun 07, 2012 9:28 am

I've heard a lot of people suggest the Sea Foam. Does it really work?

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Re: 85 gl1200 will not go over 50 mph

Postby WingAdmin » Thu Jun 07, 2012 12:48 pm

noycebj wrote:I've heard a lot of people suggest the Sea Foam. Does it really work?


Definitely does. I more than once had my 1100 sputter, or seem to bog down under heavy acceleration, or not start as well as it should. A tank or two with Seafoam added, and the problems vanished. Usually once a year, in the Spring after a winter hibernation.

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Re: 85 gl1200 will not go over 50 mph

Postby Ghostrider52005 » Thu Jun 07, 2012 9:34 pm

Also check for bad sealing top on your pelinieum . If the air box doesnt seal you will get to much air and it wont get out of its own way at full throttle.

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Poohman
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Re: 85 gl1200 will not go over 50 mph

Postby Poohman » Mon Jun 11, 2012 11:06 am

OK a quick question. I understand that I have Hydraulic lifters on my wing. If they, 1 or 2 of them are bad, will that make this running problem, a problem? and if so where can I get them.

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Re: 85 gl1200 will not go over 50 mph

Postby Ghostrider52005 » Mon Jun 11, 2012 2:15 pm

If you have stuck lifters it would be just like a car with stuck lifters and have dead cylinders. And they would make quite a whacking sound not a tapping sound. Most wings tap a bit.
U can probably find them used from a salvage on the net or possibly get new ones I dont know if they are availble for the 1200 now
I dont think you have lifter problems but instead a fuel delivery problem either in the carbs or getting to much air. Take some starting fluid and spritz it around the intake pipes the carb connections a little at a time. If its sucking air the bike will speed up when it picks up the starting fluid. Check your shifter side intake pipe and see that they put the little vaccum hose back on the rear most intake pipe just above where it goes onto the head also.

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Re: 85 gl1200 will not go over 50 mph

Postby Poohman » Tue Jun 19, 2012 7:00 am

Ok I took the starting fluid and sprayed all around the carb area's and the engine did not ramp up. So, I figured that I would take a long ride into work today and run the tank of Sea Foam through. Well Almost got to 60 going down a hill, but still does not have power in OD. It also back fires through the Exhaust, once it tach out in 2, 3, 4th gear. When I stopped at a gas station for coffee, When I went to start it back up it was like the Battery was dead. This is a brand New Battery. 2 months Old. But when cold it is a strong start. HUH ! ! ! ! I figured riding it to work and back (Roughly 52 miles round trip) it would either help or quit. LOL

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Re: 85 gl1200 will not go over 50 mph

Postby WingAdmin » Tue Jun 19, 2012 9:51 am

Just a long shot, but check your master (dogbone) fuse for cracks - remove it and inspect it, don't just look at it in the holder. If it starts to fail (and they can fail intermittently), it will prevent the battery from charging, and your bike will run only off reserve battery power - which can cause backfiring and missing, until the battery is drained.

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Re: 85 gl1200 will not go over 50 mph

Postby virgilmobile » Tue Jun 19, 2012 11:01 am

Amuse us and stick a mirror in the plenum and rap the throttle.
VERIFY the slides do in fact rise up.I do know that the rubber was changed,however if they stick,it will starve your engine.
At least it won't cost anything to look.

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Re: 85 gl1200 will not go over 50 mph

Postby Ghostrider52005 » Tue Jun 19, 2012 6:39 pm

Low spark can cause the backfiring as stated though ive seen a few that would run fine on a dead stator till the battery got down to about 9 volts and then just quit. Im still betting on fuel delivery, either stuck sliders or clogged pilot or main jets. Or pulling air someplace you shoudnt be. Anyway it sounds like its running way to lean and that either spells not getting enough fuel or getting to much air.
The weak hot start is a known issue with 1200s. The starters on a lot of 1200's will begin to drag when the engine is hot. Like a dead battery. When its cold itll spin like a top. The brushes ground on some things they shouldnt when the engine is hot due to expansion.
Seen em run for years like that as long as the rider knew to let it cool down when it did it. Then shed crank right up. But probably a new starter or rebuild is in the crystal ball somewhere down the line. My wifes does it too now and then.

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baba67
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Re: 85 gl1200 will not go over 50 mph

Postby baba67 » Wed Jun 20, 2012 5:41 am

Hi Ghostrider52005.
I was just wondering if you had your timing belts checked?
I'm wondering if one of the cams might be off by a tooth....
Just a thought.....Good luck, Bob

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Re: 85 gl1200 will not go over 50 mph

Postby Ghostrider52005 » Sun Jun 24, 2012 10:08 pm

baba67 wrote:Hi Ghostrider52005.
I was just wondering if you had your timing belts checked?
I'm wondering if one of the cams might be off by a tooth....
Just a thought.....Good luck, Bob

me
Thanks bob. If you mean me and my wifes bike that drags a lil starting when its hot like the first poster, her timing belts etc are dead on.
The starter dragging on some of these old bikes is just a fact of life. My Son in laws 84 did it, know several other guys that have had it happen on theirs and now my wifes does it. Theres a plate in the starter that with age will loosen up that lets the brushes ground out a bit when then casing is hot due to expansion. May run like that for several years as long as the rider knows what is happening and doesnt just keep grinding away until the bike sits a cools for about 20 min or so. Otherwise over time you can actually melt some of the solder out of the windings if you just keep punching the button when its hot and taking one of those spells.
As far as running my ltd and her interstate trike will both get quite a bit faster than 50 :twisted: :lol:

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baba67
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Re: 85 gl1200 will not go over 50 mph

Postby baba67 » Mon Jun 25, 2012 5:46 am

I'm sorry ghostrider....
I should have addressed my post to poohman...
Sometimes when looking over these posts, I guess I forget who actually asked the question....LOL....just my old age showing....
take care...

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noycebj
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Re: 85 gl1200 will not go over 50 mph

Postby noycebj » Fri Jun 29, 2012 8:09 am

I ran a tank of SeaFoam through, at first it acted the same, no major differance to include after i put a fresh tank of gas in. But after the second tank and even to now, i've noticed a big difference. My 85 Interstate is running smoother, i'm able to get the RPMs well past 5 when shifting, able to merge at speed onto the freeway, even downshift and pick up to about 70 before she goes into OD. I've even noticed that my backfiring and stalling in early morning hours have all but gone away.
When I put the SeaFoam in, i put about 3/4 of the can in my tank and then the rest in my crank case, ran it for about 10-15 min winding through all the gears, then changed my oil. It definately broke up the sticky crap and pushed it right out. Replaced the filter, (looked like it was about 20 years old; just bought the bike) and filled her up. Even the oil change i noticed a difference. But its been just recently that i've noticed a remarkable difference with the way she's ran, even in this 2 week long 100+ degree weather.
I would definately suggest a can, or even two, not only through the gas tank, but throught the crank case as well. Let it break up any gunk that may still be there. :)

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Re: 85 gl1200 will not go over 50 mph

Postby rcgreg » Fri Jun 29, 2012 12:29 pm

Ta Da !!!


Great stuff that seafoam !

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Re: 85 gl1200 will not go over 50 mph

Postby gre_lauren » Sat Jun 30, 2012 3:14 am

Im new here but have a suggestion on your lack of power.

Have you checked ignition timing? In the first three gears and neutral the timing is dependant on RPM only. In fourth and OD the timing is dynamic and is regulated by both RPM and throttle opening. There is a vacuum tube from one of the carb bodies that goes straight to the Ignition box. Is that line good? The manual calls that the ported vacuum line. The manual also spells out how to check ignition advance.

What do your plugs look like when the bike is sputtering along at 50. Are they super-clean with no deposits on the insulators, or are they sooty. That can point you in the right direction.
Fuel starvation? Disconnect the outlet line from the pump to the carbs and put the discharge into a container and run the pump for 30 seconds. If the fuel just trickles out, clogged fuel filter or clogged pick-up in the tank.....or bad pump.

Timing belts off by a tooth will cause a low power issue.

Lastly some of the headpipes of the early wings were double-walled. If the inner pipe collasped and restricted your exhaust you will also have the same symptoms. You can check this with a vacuum gauge hooked up to the synch ports. A low vacuum reading would indicate a plugged exhaust.

George




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