GL1100 carb rebuild


Information and questions on GL1100 Goldwings (1980-1983)
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chuckb01
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Motorcycle: 1980 Goldwing GL1100

GL1100 carb rebuild

Postby chuckb01 » Mon Dec 28, 2009 1:45 pm



Hello,
I have a 1981 GL1100 i bought a while ago that runs like c##p. Part of the reason I think is the carbs I removed them and the float height is different for all 4 of them. I have the factory and one other service manual. Float height is supposed to be .610" when the float tab just touches the valve. The float valves have a tiny spring loaded plunger in the center. My question is when measuring the float height, should this plunger be completly depressed with the needle on the needle seat or is the height measured with the float tab just touching the plunger with the valve seated on the needle seat?? I also have a decent mercury carb syncronizer that I tried and there was an improvement but I'm sure it will be better when the floats are right. Thanks guys.



cobraguy
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Motorcycle: 81 GL1100 Interstate
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Re: GL1100 carb rebuild

Postby cobraguy » Tue Dec 29, 2009 3:52 pm

I turned my carbs upside down and let the weight of the float rest on the valve. Bounce them a couple times to settle them and measure.

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chuckb01
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Re: GL1100 carb rebuild

Postby chuckb01 » Tue Dec 29, 2009 8:12 pm

cobraguy wrote:I turned my carbs upside down and let the weight of the float rest on the valve. Bounce them a couple times to settle them and measure.


Thanks for the reply BUT; I do believe that is incorrect. The adjustment may be close but doing it like that has the little plunger partly or completly depressed by the weight of the float which is not normal since the carb is upside down. And the height could vary depending on the the pressure the little spring exerts on the little plunger inside the needle. What I have come up with elsewhere is the float tab should just touch the little plunger with the needle seated. The plunger should not be depressed. I'm not sure on this but it makes sense and is simlar to what my manuals tell me. Thanks again for the reply though.

timwingard
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Location: Arlington, Va
Motorcycle: 1981 GL1100 Interstate

Re: GL1100 carb rebuild

Postby timwingard » Sat Nov 19, 2011 9:31 am

Please correct me if I am not putting this question in the correct location. I have recently rebuilt the carbs using the Randakk's carb kit and instructions by Howard Halasz with additional guidance off the web. I have a 81 Goldwing with the idle jets that do not remove and you have to clean them in place. The bike had been sitting for several years and gas would only flow in 1 carb before the rebuild due to the residue from the evaporated gas. At first I tried cleaning without submerging. I did the boiling in hot water and used the spray on cleaners. Finally I gave in with the submerssion technique and finished off with compressed air, lots of it. Even so I was not sure about those idle jets and I used a small guitar string to probe down as far as I could. I finished doing a bench sync with the guitar wire. My problem is that when I start the bike, the rpm is about 3 - 4 K vs 1K (950 - 1050). I tried adjusting down with with the throttle stop screw and nothing happens. I am not sure what to try next. Any ideas what could be wrong and how to fix? Thanks

timwingard
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Re: GL1100 carb rebuild

Postby timwingard » Sat Nov 19, 2011 3:25 pm

Forgot to state that the idle mixture screws were backed on 1 and a half turns.

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littlebeaver
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Re: GL1100 carb rebuild

Postby littlebeaver » Sat Nov 19, 2011 6:31 pm

I can tell you how I did my float heights, I got a small wooden dowel and made a 15.5 mm mark on it, put the carb body on its side, placed the dowel to measure the float then slowly lean the body until the float stops once it stops that's the point at which I mesured the height... On the uneven Idle, it's your idle jets, I pulled mine out using an easyout tool bit, I think it was a #2 easyout and I used a small adjustable wrench. just lightly tap it down into the top of the jet turn counterclockwise and it should break the seal and the jet will come right out..Or you can leave it in and try to clear the side jets on it with a wire..it's up to you... :D

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RBGERSON
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had every year from 75 to 83

Re: GL1100 carb rebuild

Postby RBGERSON » Sun Nov 20, 2011 7:59 am

You set the float level with the carbs standing up on end at a slight angle so the tab just touching the pin then flip them around and do the other two..NOT depressed..and measure from the lip of the bowl ..to the top of the float(really the bottom when on the bike) at both ends. Also you need to check the floats themselves for lever, square and straight too, while out and on your bench.

The final check, if you want to be perfect, once all back together..take drain plugs out , "screw in 1/4" , 1'long pieces of clear tubes hold all tubes up above carb body. level the carbs
.....supply fuel to carbs..fuel should rise in the tubes to just below the lip of the bowls..carbs absolutely level on the bench..put small level on the plenum with and length wise to check level..
Attachments
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB

timwingard
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Motorcycle: 1981 GL1100 Interstate

Re: GL1100 carb rebuild

Postby timwingard » Sun Nov 20, 2011 10:58 am

Little Beaver, That is a very nice looking bike by the way. So from your post, you think it has something to do with the floats. I didn't really want to mess with the floats and kind of checked them out the correct way and just said they were close enough vs doing a through job. I am surprised it would make that much difference. My idle starts out 3-4 and seems to move up even higher as it warms up like say around 5-6k, which is quite alarming. Something is definately wrong and I guess I need to remove the carbs and start over. AT least now I somewhat know what I am dealing with. When you say you remove the jet, are you removing the jet or a plastic or rubber cover over the jet? The jet is suppose to be very small I understand and to be cleaned very carefully with a very small guitar string wire. It seems that tapping an easyout into the jet would permanently damage it. And once you get it out, how did you get it back in? I had a feeling that the circuit was not open but I didn't know it would cause the idle to go sky high. I was expecting more of a rough idle.

timwingard
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Motorcycle: 1981 GL1100 Interstate

Re: GL1100 carb rebuild

Postby timwingard » Sun Nov 20, 2011 11:06 am

RBGERSON, Thanks for you post as well. I need to redo my float measurements for sure and you provided some good insight on how to make sure thay are correct.

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littlebeaver
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Re: GL1100 carb rebuild

Postby littlebeaver » Sun Nov 20, 2011 3:43 pm

timwingard wrote:Little Beaver, That is a very nice looking bike by the way. So from your post, you think it has something to do with the floats. I didn't really want to mess with the floats and kind of checked them out the correct way and just said they were close enough vs doing a through job. I am surprised it would make that much difference. My idle starts out 3-4 and seems to move up even higher as it warms up like say around 5-6k, which is quite alarming. Something is definately wrong and I guess I need to remove the carbs and start over. AT least now I somewhat know what I am dealing with. When you say you remove the jet, are you removing the jet or a plastic or rubber cover over the jet? The jet is suppose to be very small I understand and to be cleaned very carefully with a very small guitar string wire. It seems that tapping an easyout into the jet would permanently damage it. And once you get it out, how did you get it back in? I had a feeling that the circuit was not open but I didn't know it would cause the idle to go sky high. I was expecting more of a rough idle.

timwingard, you should do as you wish... :D The idle jet has holes on the side's as well... :D

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littlebeaver
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Re: GL1100 carb rebuild

Postby littlebeaver » Sun Nov 20, 2011 7:37 pm

I have a suggestion for you, go to the top of this page and key in idle jets in the search box on the right and read all the post on this subject you may even see some photo's of different people removing the the slowjets as it's also called. Please don't take my advise because it's probably wrong, you should do what the professional mechanic's tell you and I'm far from that.. :lol: some of the guy's here are really good mechanics and they have taught me alot...Your idle should be 950 to 1000, 3k is kinda too high, turn down the idle screw on the back of the carb's body...

timwingard
Posts: 43
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Location: Arlington, Va
Motorcycle: 1981 GL1100 Interstate

Re: GL1100 carb rebuild

Postby timwingard » Tue Nov 22, 2011 7:24 am

Thanks littlebeaver, I will check out the posts on the idle screw. I see you put a new pic of your bike on your profile. Nice. I am not it any big hurry to jump in there an pull the carbs out and at least it is running now. I will do some investigation before jumping back it. Thanks for your advice.

timwingard
Posts: 43
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Location: Arlington, Va
Motorcycle: 1981 GL1100 Interstate

Re: GL1100 carb rebuild

Postby timwingard » Sat Jan 14, 2012 10:37 pm

Well I finally got back to removing my carbs due to high idle and possibly float issues. Since I have the 1981 with the non removable idle jets I took one out with a #1 easy out. It didn't pop right out but eventually came out. Maybe I should have used a #2 since when I went to remove the one from the second carb the easy out snapped off and now is lodged down in the carb. I went ahead and recleaned the carb body but the idle jet I removed is still clogged even after soaking it in carb cleaner for 30 minutes. The good news is I have an extra bank or carbs that have the removable jets. I think I am just going to rebuild them and forget the the ones I had originally.

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littlebeaver
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Re: GL1100 carb rebuild

Postby littlebeaver » Sat Jan 14, 2012 11:16 pm

I use a #2 easy out bit, #1 is too small just get a small drill bit and drill it out...Want to sell them to me? For cheap, I can fix it...

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littlebeaver
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Re: GL1100 carb rebuild

Postby littlebeaver » Sun Jan 15, 2012 1:59 am

Tim, if you can drill a small hole through it right in the center, then another larger hole after that the easy out part should spin right out because it's spining clockwise, your mistake was trying this with a #1 bit, If I knew you were going to try that I would have said NO No too small, number 2 will remove them.. when you drill the holes out and it doesn't spin out just get a drywall screw and put it in the hole and turn it clockwise it should come out..Nothing is damaged...

timwingard
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Re: GL1100 carb rebuild

Postby timwingard » Tue Jan 17, 2012 8:17 pm

Thanks Little Beaver for the instructions. I will get back to those carbs some day. I ended up rebuilding a set of 82 carbs and it was so much easier cleaning the slow jets. Just screwed them out, soaked them and used a guitar string to knock throw the smallest pin hole. Now I can see light at the end of the jets. The experience with the 82 carbs will make finishing the 8o carbs easier. But I will have to buy another carb kit for the 80s since I took them apart and took back all the new parts. But I have an extra engine so I do expect to finish them one day. Next I need to check the float heights and do a bench sync before putting them back on.

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littlebeaver
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Re: GL1100 carb rebuild

Postby littlebeaver » Tue Jan 17, 2012 8:58 pm

Tim don't feel bad Tim man , I practically blew my ass up with my electrical trouble, it took me a while to fix it with help from guy's here.. :shock: They tell me something and I go a fudge it up :shock: I'm no good with sparks man, :o I'm a big fat chicken dude.. :lol: glad you got the 82's ..

prowler99
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Motorcycle: 1982 Honda GL1100

Re: GL1100 carb rebuild

Postby prowler99 » Thu Jan 19, 2012 1:30 pm

I can tell you after building thousands of carburetors of different types ( motorcycles,air planes,automobiles etc)
that a floats job is let in enough gas to run the engine but shut off when the bowl is full so it doesn't run out
the vent. With that said I eyeball the float and adjust with blowing the fuel inle, when it shuts the flow off and the float is
level with bowl or body I stop. That's the easy way! I make sure it will drop enough as not hang on anything in the bottom
of the bowl and gentlment thats a tried & true method without a lot of stupid measuring ! And I did say THOUSANDS at the
beginning.

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PAPete
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1982 GL1100-I

Re: GL1100 carb rebuild

Postby PAPete » Sat Jan 21, 2012 2:02 pm

prowler99 wrote: With that said I eyeball the float and adjust with blowing the fuel inle, when it shuts the flow off and the float is
level with bowl or body I stop. That's the easy way!


I'm afraid I don't quite understand how you are doing this. How are you "blowing the fuel inle(t)"? And are the carbs perfectly level when you do this? Could you give us more detail? Thanks a lot.
Pete
82 GL1100-I
85 GL 1200-A

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k2bertie
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Location: Glasgow, Scotland, UK
Motorcycle: 1980, Honda GL1100 interstate

Re: GL1100 carb rebuild

Postby k2bertie » Sat Jun 09, 2012 6:38 am

Hi, to the man who has done a few carbs Prowler I believe Hi,
I am now on the forth time of cleaning my carbs previouse cleans but not clean enough. I have at last found the problem, not the pilot jets as they are clean and can see daylight, but it is the conection tubes in the castings are blocked from the resevior to the pilot jets and too the air cut off chambers, seems on all four carbs. Is this a boil and boil again as I have soaked in cleaner for longer than they say. My Bike had stood for 16 plus years, I bought it to restore every thing else great Just these B***DY carbs. This is for all of you who can help PLEEEASE

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littlebeaver
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Re: GL1100 carb rebuild

Postby littlebeaver » Sat Jun 09, 2012 9:54 am

There's a few thing's I would check out, I have different methods than most but they work for me...I would remove all the air cut off valves, now you really don't have to take all the carb tubes off and sperate them to remove these, take a good look at the screws that mount the inside one's, I took one of those 90 degree screw drivers and loosen the screws and removed them like that, then to make sure the passage way was clear I would use a clear fishing line and push it thru each passage, if it doesn't come out the top tower then you have a clog in that passage, check all the passages, look at the tiny air passages on the covers of the cut off valves too, blow everything out with air..It's kind of a caveman way of doing it but I found two passages clogged like that..Oh and don't loose that tiny oring in the air cut off valve cover..

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k2bertie
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Re: GL1100 carb rebuild

Postby k2bertie » Sat Jun 09, 2012 10:03 am

THanks that a good tip as I am not a fisherman I would not have thought of that, what about the one from the float chamber to the pilot jet as this is blind at both ends, that is my biggest prob. I have stripped the carbs to bare bones all jets, diaphrams, all seal etc etc.

Thanks again

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k2bertie
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Re: GL1100 carb rebuild

Postby k2bertie » Sat Jun 09, 2012 10:07 am

PS. great Info best site I've been on for help and advice.

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k2bertie
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Re: GL1100 carb rebuild

Postby k2bertie » Sat Jun 09, 2012 10:52 am

Hi, the towers you are talking about are in the float chamber? if so no I have not removed these, what about the pilot screw "jet" would this be blocked as I can see daylight through it, Its never ending as the workshop manual (Haynes) is not that great for carb maintenance etc. I have been looking at a 5 bar steam cleaner as apossed to a dental pik, I am wondering with time and patience would this clean these jets? Save the removal and aviod any accidents with these jets, I wonder what your thought are on that.

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echinus1988
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Location: Denver, Colorado
Motorcycle: 1982 GL1100 Aspencade

Re: GL1100 carb rebuild

Postby echinus1988 » Sun Oct 06, 2013 1:59 am

So for a 1980 GL1100, the float height is 15.5mm (Clymer says 22mm)? Also, where is measured from? The center, end, tip? Just trying to get it done right this time. then it's onto the pulse generator since I have no spark.

Can anyone tell me if I missed something putting the rear case back on, did I miss attaching something for the pulse generator? I know there is a shaft but the book never told me anything to do extra to the advance or pulse generator.

Thank you.




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