Gl1000 Carb issues ,First post from NZ

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Bloodhound
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Gl1000 Carb issues ,First post from NZ

#1

Post by Bloodhound »

Hi , the 76 Gold wing has been in the family 30 years , in the 10 years that i have owned it hasn't been used , as it needed brakes carbs etc , anyway finally the fuel tank has been cleaned with electrolysis ,replace timing belts and fitted new tensioner bearings , tires replaced, bearings , muffler welded ,brake masters and slaves all rebuilt etc new points timed in to T-1 and T-2 .new advancer , Tappets checked and adjusted as required ,Carbs have been on the bench as they were leaking somewhere in the middle and have been hand cleaned with all parts kept to each carb number and 1-3 and 2-4 were kept screwed together to avoid issues with the linkage , used randakks plenum orings and original fuel inlet control valves ,and i had some K & L kits ,the only part per each carb i couldnt clean was the idle jet ( that is one small hole ) so better than no hole ,i used a new idle jet on each carb , so after getting it going , great no more leaks , ran quite well but had slight hesitation , i did the needle mod but only had a .012" washer , now after checking stuff i found the hesitation was caused by a lazy cylinder as the exhaust temp at header #3 was at half the temperature and when adjusting the mixture the the # 3 carb mixture screw made no change :IDTS: , when riding it took off like a rocket when the revs came up , all compression is in the 145-150 range , also the coils were a bit dodgy loose HT lead , so i have just replaced them , So can the Carby experts give me their opinion , i think it must be drawing fuel from somewhere else, and i need to recheck all the air and idle mixture passage on #3 ,and seemed to run worse after sync all though they were bang on . Cheers from New Zealand . any help greatly appreciated .
76 GL1000 ,73 Norton mk5 , 75 Triumph T160 , 49 Matchless G80 500 rigid ,and
X4 76 HondaTL250s
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gltriker
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Re: Gl1000 Carb issues ,First post from NZ

#2

Post by gltriker »

Greetings and welcomes from the northeast USA.
My first thought is although the #35 slow fuel jet in the #3 carburetor may not be obstructed, the passage in the brass pilot discharge tube positioned downstream from the throttle plate might be, itself.
Last edited by gltriker on Tue Mar 09, 2021 10:27 pm, edited 1 time in total.
Cliff (74yrs ;) )

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RE: a thorough fuel tank cleaning
"And your carbs will thank you. They no longer live down stream from a sewage plant." -gregforesi tumb2
"Can't see the paint when your looking thru the handlebars..........." -Oldewing ;)
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Cliff

'75 GL1000 home built trike; http://www.ngwclub.com/forum/viewtopic.php?f=30&t=39996
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Re: Gl1000 Carb issues ,First post from NZ

#3

Post by Bloodhound »

Thank for your reply , I took the intake boot off and then disconnected the hose on the side of the carb , and then thought if I blow air in there , with a full fuel bowl I would have a continuous stream of idle air fuel discharging from that hole , all I got was a couple of shots of misted fuel , I thought it might continue but no , maybe I need air through the other passage in the plenum , I have carbs off and will follow those passages with brake clean and attach the plastic nozzle hose . Thanks Vaughn.
76 GL1000 ,73 Norton mk5 , 75 Triumph T160 , 49 Matchless G80 500 rigid ,and
X4 76 HondaTL250s
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Re: Gl1000 Carb issues ,First post from NZ

#4

Post by ericheath »

Not a carb expert, but the washer trick is for 77 models. It sounds as if you have an issue in the idle circuit. It could be as Cliff GLTriker mentioned. Some people here report removing the idle adjust screw and use carb cleaner and air pressure while the bike is running to help purge the passages. With the carbs off you can get a sense of how clear the idle passages are by giving it a shot of brake cleaner and note how it comes out of the brass pilot and the three holes in the throat. Obviously don’t have your face right in the exit pathway.

When cleaning, we’re you able to get all pucks removed?

You didn’t mention synchronization, I assume you have done that?

The off-idle fix is a slightly smaller jet in the idle air jet, the one that has a tube running from the plenum to the upper side of the carb. Each year had slightly different specs. See Randakk’s site for the 76 model.
Whatever I suggest here should be given ample time for a moderator to delicately correct. I apologize in advance.
77 WING, 1200 engine with 77 heads, cams, gl1100 foot pegs, Magna V65 front end, 764A carbs, [-gone Suzuki M109 monoshock--, replaced with gl1100 shocks] gl 1200 swing arm, gl1500 final drive, wheel and rear brakes Valkyrie seat, Meanstreak tank, Sportster pipes, Power Arc ignition off crank.
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Re: Gl1000 Carb issues ,First post from NZ

#5

Post by ericheath »

9D9B2392-82DC-43C5-A229-41E0B289BE73.jpeg
9D9B2392-82DC-43C5-A229-41E0B289BE73.jpeg (176.58 KiB) Viewed 582 times
https://www.randakksblog.com/how-to-cur ... flat-spot/
Whatever I suggest here should be given ample time for a moderator to delicately correct. I apologize in advance.
77 WING, 1200 engine with 77 heads, cams, gl1100 foot pegs, Magna V65 front end, 764A carbs, [-gone Suzuki M109 monoshock--, replaced with gl1100 shocks] gl 1200 swing arm, gl1500 final drive, wheel and rear brakes Valkyrie seat, Meanstreak tank, Sportster pipes, Power Arc ignition off crank.
77 Wing. black
83 Wing, in pieces
"Continuing education is important even if the subject matter is fairly useless (as in this case)."---Greg Foresi
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Re: Gl1000 Carb issues ,First post from NZ

#6

Post by Bloodhound »

The gl is registered as a 77 in NZ but after looking at videos etc , I am sure its a 76 , all the other carbs adjust down an cause engine to die , yes all pucks came out 3 nice holes , bike has 21,750 kms original mileage . Cheers
76 GL1000 ,73 Norton mk5 , 75 Triumph T160 , 49 Matchless G80 500 rigid ,and
X4 76 HondaTL250s
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ericheath
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Re: Gl1000 Carb issues ,First post from NZ

#7

Post by ericheath »

I meant to mention the air jet mix up too. It’s easy to get one set backwards, the smaller air jet goes above the main jet, and visaversa. Can be seen by just sliding the carbs out and removing the cap and kidney cover.
Whatever I suggest here should be given ample time for a moderator to delicately correct. I apologize in advance.
77 WING, 1200 engine with 77 heads, cams, gl1100 foot pegs, Magna V65 front end, 764A carbs, [-gone Suzuki M109 monoshock--, replaced with gl1100 shocks] gl 1200 swing arm, gl1500 final drive, wheel and rear brakes Valkyrie seat, Meanstreak tank, Sportster pipes, Power Arc ignition off crank.
77 Wing. black
83 Wing, in pieces
"Continuing education is important even if the subject matter is fairly useless (as in this case)."---Greg Foresi
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Re: Gl1000 Carb issues ,First post from NZ

#8

Post by Rat »

Welcome to the 'Wingdom' ... lots of help here

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Re: Gl1000 Carb issues ,First post from NZ

#9

Post by gltriker »

I am not a carburetor expert but have experienced a lot of common issues to be studied in this forum.
You have to be sure that all fuel bowl retaining screws threads in the carburetor body are not compromised.

If all 4 screws are not equally clamping the fuel bowl onto the fuel bowl gasket, the part of the gasket that covers the puck and the inlet end of the pilot tube will allow an external atmospheric air leak into the idle fuel delivery circuit.
Last edited by gltriker on Sun Mar 14, 2021 12:56 pm, edited 2 times in total.
Cliff (74yrs ;) )

Keep your eyes and ears open and you'll learn something new, everyday. tumb2

New users please visit our "Shop Talk" for common tips and help: <---jdvorchak
http://www.ngwclub.com/forum/page/ST
^^^^^^^click up here^^^^^ :oldies

RE: a thorough fuel tank cleaning
"And your carbs will thank you. They no longer live down stream from a sewage plant." -gregforesi tumb2
"Can't see the paint when your looking thru the handlebars..........." -Oldewing ;)
"I'd rather Ride than Shine" -RAT tumb2 Me Too!!

Cliff

'75 GL1000 home built trike; http://www.ngwclub.com/forum/viewtopic.php?f=30&t=39996
October,2017 BOTM :shock: https://nakedgoldwingsclub.com/forum/page/Welcome

previous rides:
1953 H-D Servi-car, naked, 1969-1978 (serial#53G1559 committed to memory!)
1980 CB900 Custom (triked) 1997-2003 .... R.I.P.
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Re: Gl1000 Carb issues ,First post from NZ

#10

Post by Bloodhound »

Thanks , I haven't had any issues with the bowl threads yet , but was aware that they strip out easily. Thanks for the tip .
Cheers
76 GL1000 ,73 Norton mk5 , 75 Triumph T160 , 49 Matchless G80 500 rigid ,and
X4 76 HondaTL250s
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Re: Gl1000 Carb issues ,First post from NZ

#11

Post by pidjones »

Bloodhound wrote: Mon Mar 08, 2021 11:59 am Thanks , I haven't had any issues with the bowl threads yet , but was aware that they strip out easily. Thanks for the tip .
Cheers
Timeserts and Helicoils are easy to put in the soft metal. To avoid stripping the heads, use only JIS screwdrivers.
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Re: Gl1000 Carb issues ,First post from NZ

#12

Post by Whiskerfish »

Bloodhound wrote: Sun Mar 07, 2021 11:56 am The gl is registered as a 77 in NZ but after looking at videos etc , I am sure its a 76 , all the other carbs adjust down an cause engine to die , yes all pucks came out 3 nice holes , bike has 21,750 kms original mileage . Cheers
If the engine dies with one carb "adjusted down" then it is not running on all 4. A proper running engine will only drop 50 to 100 rpm when any single is closed off. Repeat the process and see which one does not cause the bike to quit. Probably # 3 as you have noted already. If it keeps running with # 3 closed down then yes you still have an issue with the idle circuit in that carb. Be very careful with air pressure as anything over about 10psi can damage the seals on "built up" carbs. These carbs operate at 2-3 psi and the seals and sealing surfaces are not designed for much higher. Many of the ORings are not supported by structure and can blow out easily. When they are all apart feel free to use higher pressures to clean out passageways.
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Re: Gl1000 Carb issues ,First post from NZ

#13

Post by Bloodhound »

So I removed carbs again , and separated number 3 from the plenum removed all parts again and gave it the ultrasonic treatment for 20 minutes as well as blowing through all idle circuit channels with plenty of brake clean . Then I fitted the mixture screw about 5 or 6 turns out, then using the old bowl gasket placed over the puck hole so that I could get an air gun sealed on a hole in the gasket and also press down on the back of the small slot where the nozzle is pressed into so that I could get some reverse flow , and more brake clean . The elbows were rock hard so I soaked them oil of wintergreen and rubbing alcohol for 2 days another would have helped but a lot better , finished off fitting new coils new NGK plug caps , removed the resistor and replaced with 5x18mm S/S pin and fitted new iridium plugs and all cylinders are firing , awesome , starts within 1/2 a turn i have managed a kick start , get it on the road real soon , I think it will do the motor a lot of good . Cheers and thanks .
76 GL1000 ,73 Norton mk5 , 75 Triumph T160 , 49 Matchless G80 500 rigid ,and
X4 76 HondaTL250s
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Re: Gl1000 Carb issues ,First post from NZ

#14

Post by cfairweather »

From what you have described, I think you have one or more clogged idle discharge ports. Did you spray brake cleaner or carb cleaner through these tubes when you have the carbs off? Sometimes you can clear these by removing the idle screw and putting some gasoline or cleaner in the hole and applying some air pressure as noted from an above comment.
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Re: Gl1000 Carb issues ,First post from NZ

#15

Post by gltriker »

Bloodhound wrote: Sun Mar 14, 2021 4:01 am The elbows were rock hard so I soaked them oil of wintergreen and rubbing alcohol for 2 days another would have helped but a lot better , .
Although I haven't encountered this aggravating issue,
there are various strategies to address the problem with, rock hard elbows.

Here is one from a well regarded member. Starts at post #1714. Be sure to continue to scroll down to post#1725.
viewtopic.php?f=30&t=51412&hilit=Pedro&start=1710
Cliff (74yrs ;) )

Keep your eyes and ears open and you'll learn something new, everyday. tumb2

New users please visit our "Shop Talk" for common tips and help: <---jdvorchak
http://www.ngwclub.com/forum/page/ST
^^^^^^^click up here^^^^^ :oldies

RE: a thorough fuel tank cleaning
"And your carbs will thank you. They no longer live down stream from a sewage plant." -gregforesi tumb2
"Can't see the paint when your looking thru the handlebars..........." -Oldewing ;)
"I'd rather Ride than Shine" -RAT tumb2 Me Too!!

Cliff

'75 GL1000 home built trike; http://www.ngwclub.com/forum/viewtopic.php?f=30&t=39996
October,2017 BOTM :shock: https://nakedgoldwingsclub.com/forum/page/Welcome

previous rides:
1953 H-D Servi-car, naked, 1969-1978 (serial#53G1559 committed to memory!)
1980 CB900 Custom (triked) 1997-2003 .... R.I.P.
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