Think it's carb?


Information and questions on GL1100 Goldwings (1980-1983)
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83 goldwing az
Posts: 9
Joined: Thu Nov 28, 2013 10:08 pm
Location: Tucson, AZ
Motorcycle: 1983 GL1100 Interstate

Think it's carb?

Postby 83 goldwing az » Thu Nov 28, 2013 11:34 pm



Just bought 83 interstate 500.00 runs great till
#2 plug fouls. 4 is getting black as well. New plugs and cleaning carb by me.
I don't know much about carbs, but a few parts and cleaner for the
gas left in it for over 2 years, I went to balance them and it
started running rough. Plugs on 1&3 pretty as a pic.
Any ideas?



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RBGERSON
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Location: SCOTTSDALE, AZ
Motorcycle: 98 SE GL 1500
had every year from 75 to 83

Re: Think it's carb?

Postby RBGERSON » Fri Nov 29, 2013 7:33 am

weak spark?, bad plug wire, bad cap, timing, flooding, could be any or all of these. If 1 and 3 look good probably not coil issue. check with plugs out, gas off block plug holes, plugs on block look at spark should be nice fat white or blue. Next pull air box look for flooding in the plenum on the 2/4 side. Next check timing and then belts/cam wheel for correct setting.
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

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RB

83 goldwing az
Posts: 9
Joined: Thu Nov 28, 2013 10:08 pm
Location: Tucson, AZ
Motorcycle: 1983 GL1100 Interstate

Re: Think it's carb?

Postby 83 goldwing az » Fri Nov 29, 2013 10:41 am

Thank you , it gives me a start. Can the floats cause flooding?
I guess YES! Will check spark to rule a few things out. Bike was running flawless up untill plug foul.
This gives me pause, any more ideas would be helpful as I am very new
to bike repair. All I have is wrenches and common sense.

83 goldwing az
Posts: 9
Joined: Thu Nov 28, 2013 10:08 pm
Location: Tucson, AZ
Motorcycle: 1983 GL1100 Interstate

Re: Think it's carb?

Postby 83 goldwing az » Fri Nov 29, 2013 11:14 am

Thank you , it gives me a start. Can the floats cause flooding?
I guess YES! Will check spark to rule a few things out. Bike was running flawless up untill plug foul.
This gives me pause, any more ideas would be helpful as I am very new
to bike repair. All I have is wrenches and common sense.

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RBGERSON
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Location: SCOTTSDALE, AZ
Motorcycle: 98 SE GL 1500
had every year from 75 to 83

Re: Think it's carb?

Postby RBGERSON » Fri Nov 29, 2013 4:45 pm

bad float needle or seat/crud more likely the cause of flooding if the floats are set correctly they won't change unless you fool with them..it could be binding on the float pin..again crud build; up tapping on the bowl can loosen the float and allow it to work properly..but a carb cleaning or rebuild would be in your future..
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB

83 goldwing az
Posts: 9
Joined: Thu Nov 28, 2013 10:08 pm
Location: Tucson, AZ
Motorcycle: 1983 GL1100 Interstate

Re: Think it's carb?

Postby 83 goldwing az » Fri Nov 29, 2013 7:53 pm

Spark good. In the process of taking carbs off. Will be checking floats are they set at 15.5mm?
I take it they are adjustable, screw or tab bending or ......?

indianakid
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Motorcycle: 83 GL1100 I

Re: Think it's carb?

Postby indianakid » Fri Nov 29, 2013 10:31 pm

500 for a 1983 interstate is a good deal ...................

but i have to ask why ????????????????

spark would generally affect the front (1 and 3) or rear (2 and 4) cylinders. carbs could affect any or all cylinders or only 2 and 4 as the problem you have. but it could also be caused by a PO having troubles replacing belts, lightly bumping the valves, finished putting it together and selling it ............(could explain "good deal")................

have you checked compression???? i would. just so you know what you are starting with and put an end to the bad PO myth.

83 goldwing az
Posts: 9
Joined: Thu Nov 28, 2013 10:08 pm
Location: Tucson, AZ
Motorcycle: 1983 GL1100 Interstate

Re: Think it's carb?

Postby 83 goldwing az » Sat Nov 30, 2013 1:32 am

So lost! The plugs 2 and 4 are getting black and 2 is the one that I think is the worst. I put in new plugs all around and this bike came to life like a newborn. With a great sound and smooth when reved.
As I was listening to the great sound and smiling , I pulled out the carb sync kit, was putting it together and it started running rough. I pulled the plugs and found the same two plugs looking black .
This is what I am trying to resolve.
All help appreciated!!!
Any thoughts? I hope explanation of symptoms will help.

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RBGERSON
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had every year from 75 to 83

Re: Think it's carb?

Postby RBGERSON » Sat Nov 30, 2013 8:42 am

Did you look at plenum to see if you can see gas flowing to 2 and 4 if so not good, have you checked the valves? fouling plugs = bad plugs/wire/low spark, low compression, rich mixture or timing off.
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB

83 goldwing az
Posts: 9
Joined: Thu Nov 28, 2013 10:08 pm
Location: Tucson, AZ
Motorcycle: 1983 GL1100 Interstate

Re: Think it's carb?

Postby 83 goldwing az » Sat Nov 30, 2013 11:23 am

I will check compression hopefully today. How do you adjust mixture per carb? The bike ran great hence -eliminate timming, plug wires, low spark, bad plugs.
Where and what is the plenum? Looked it up... still confused.

83 goldwing az
Posts: 9
Joined: Thu Nov 28, 2013 10:08 pm
Location: Tucson, AZ
Motorcycle: 1983 GL1100 Interstate

Re: Think it's carb?

Postby 83 goldwing az » Sat Nov 30, 2013 11:25 am

Haven't checked valves.

83 goldwing az
Posts: 9
Joined: Thu Nov 28, 2013 10:08 pm
Location: Tucson, AZ
Motorcycle: 1983 GL1100 Interstate

Re: Think it's carb?

Postby 83 goldwing az » Sat Nov 30, 2013 11:29 am

Do I still check carbs for proper float setting?

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80-GL100-INT
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Re: Think it's carb?

Postby 80-GL100-INT » Sat Nov 30, 2013 12:48 pm

83 goldwing az wrote:I will check compression hopefully today. How do you adjust mixture per carb? The bike ran great hence -eliminate timming, plug wires, low spark, bad plugs.
Where and what is the plenum? Looked it up... still confused.


The idle mixture is adjusted with the screws located on the bottom of each carb right in the front of bowls. They (should) have a tab on them that only allow approx. 360* of turn.

The plenum is the large aluminum "box" that the carbs attach to, if you remove the air filter you should be able to look directly down into the plenum. You should be able to see gas pooling on the 2-4 side if it is indeed getting too much fuel (stuck or mis-adjusted needle)(yes the floats adjust by bending the tab) an extending mirror can be helpful.

indianakid wrote:500 for a 1983 interstate is a good deal ...................

but i have to ask why ????????????????

spark would generally affect the front (1 and 3) or rear (2 and 4) cylinders. carbs could affect any or all cylinders or only 2 and 4 as the problem you have. but it could also be caused by a PO having troubles replacing belts, lightly bumping the valves, finished putting it together and selling it ............(could explain "good deal")................

have you checked compression???? i would. just so you know what you are starting with and put an end to the bad PO myth.


I might tend to agree here...check compression...could be bad rings or scoring in the cylinder walls, allowing oil to pass. PO passing the buck.
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PAPete
Posts: 48
Joined: Sat Apr 17, 2010 9:39 pm
Location: Kennett Square, PA
Motorcycle: 1985 GL1200-A
1982 GL1100-I

Re: Think it's carb?

Postby PAPete » Sun Dec 01, 2013 2:56 pm

indianakid wrote:
but i have to ask why ???????????????? spark would generally affect the front (1 and 3) or rear (2 and 4) cylinders.


Just so there is no confusion: Plugs 1 & 2 are in the front; plugs 3 & 4 are in the rear. 1 & 3 are on the right as you sit n the bike.
Pete
82 GL1100-I
85 GL 1200-A

indianakid
Posts: 124
Joined: Sun Sep 26, 2010 5:28 pm
Location: long beach, ca
Motorcycle: 83 GL1100 I

Re: Think it's carb?

Postby indianakid » Sun Dec 01, 2013 3:34 pm

Good catch PAPete !!!

that is what i had meant to say. that should teach me not to post replies that late on a friday night !

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WINGER3
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Re: Think it's carb?

Postby WINGER3 » Mon Dec 02, 2013 4:32 pm

If you are not getting blue smoke, then rings or valve seals not the problem. Stuck float needles are probaly the most likely problem if it ran great with plug change and then fouled. Float level also could be it or both, since it idled smooth when running right don't mess with the idle jets as they are good. You can remove the brass screw plugs on the side of float bowles and see what comes out. Put a rag under them while engine is cold to prevent any chance of fire, you just might cure the problem if you get a lot of crud from them. If you get crud, get a can of brake fluid/carb cleaner and spray inside of the carb bowels to flush out any crud, this can also cure the problem, make sure you use face shield or mask as this spray can get into your eyes and face, thats not good. A can of seafoam in the gas will also cure a lot of problems with the carbs. Good luck and replace those timming belts if PO did not give you receipt for the replacement. :mrgreen:


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