New Mixture Screws
Moderators: CYBORG, Oldewing, robin1731, Forum Moderators
- chewy999
- SUPER BIKER!!!!
- Posts: 3214
- Joined: Tue Oct 16, 2012 11:21 am
- Location: Haddenham, Cambs, UK
New Mixture Screws
Today I put new 'mixture screws', item 5 here - https://www.cmsnl.com/honda-gl1100-gold ... wcIYuSG99A into the carbs, with the carbs still on the bike.
Started by taking off the false tank and manifolds on one side to give plenty of room to work in.
Then placed a towel over the cylinder head to stop stuff falling into the chamber. The parts for the screws are VERY small. Then using a right angled adjusting tool, unscrewed each screw.
I know some of you find these tools awkward to use, but I find if you get it on as square as possible, then just apply a little downward pressure at the opposite end from the working part, it holds in position while you turn the adjuster either way.
Then the fun part. Chances are when the screw comes out, the washer and O ring stay inside the carb. In fact, of the four I did today, only one washer came out with the screw!
I used a piece of copper wire with a small bend in the end to fish the washer and O ring out. It worked pretty well apart from the O ring in no. 3, which took about 10 minutes to come out. Still easier than taking the carbs out.
Prepared the new screws, making sure the spring goes on first, followed by the washer and finally the O ring.
Then carefully insert the screw into the hole and using the adjusting tool, tighten the screw carefully until you feel a slight resistance. DO NOT TIGHTEN any more or you will damage the end of the new screw.
Different years give different figures as an initial setting. The 1980 figure is 1 1/4 turns out, I did 2, but all of the screws should be the same.
Refitted the manifolds and dummy tank and after cleaning and checking the spark plugs, I fired her up. Seemed to idle a lot better, but didn't get chance to test ride it, but pleased with my efforts. As far as I know, actually didn't break anything else today, which is unusual for me!
Started by taking off the false tank and manifolds on one side to give plenty of room to work in.
Then placed a towel over the cylinder head to stop stuff falling into the chamber. The parts for the screws are VERY small. Then using a right angled adjusting tool, unscrewed each screw.
I know some of you find these tools awkward to use, but I find if you get it on as square as possible, then just apply a little downward pressure at the opposite end from the working part, it holds in position while you turn the adjuster either way.
Then the fun part. Chances are when the screw comes out, the washer and O ring stay inside the carb. In fact, of the four I did today, only one washer came out with the screw!
I used a piece of copper wire with a small bend in the end to fish the washer and O ring out. It worked pretty well apart from the O ring in no. 3, which took about 10 minutes to come out. Still easier than taking the carbs out.
Prepared the new screws, making sure the spring goes on first, followed by the washer and finally the O ring.
Then carefully insert the screw into the hole and using the adjusting tool, tighten the screw carefully until you feel a slight resistance. DO NOT TIGHTEN any more or you will damage the end of the new screw.
Different years give different figures as an initial setting. The 1980 figure is 1 1/4 turns out, I did 2, but all of the screws should be the same.
Refitted the manifolds and dummy tank and after cleaning and checking the spark plugs, I fired her up. Seemed to idle a lot better, but didn't get chance to test ride it, but pleased with my efforts. As far as I know, actually didn't break anything else today, which is unusual for me!
Previous Rides,
1980 CB250N Good to learn on
1981 CX500 good mid range tourer, went to Austria on it!
1983 GL1100C Pride and joy, sold when I bought my 1st house, big mistake
1985 GL650 Silverwing another mistake, horrible bike
1986 CBX550 Good commuter
1989 Suzuki GS750 (1976) cheap and cheerful until a dog ran out in front of me on Xmas Eve, 1991
Current bikes
2010 CB1300 back on a bike after 19 years, two divorces, children grown up etc
1980 GL1100 NOW ON THE ROAD, still use CB1300.
1980 CB250N Good to learn on
1981 CX500 good mid range tourer, went to Austria on it!
1983 GL1100C Pride and joy, sold when I bought my 1st house, big mistake
1985 GL650 Silverwing another mistake, horrible bike
1986 CBX550 Good commuter
1989 Suzuki GS750 (1976) cheap and cheerful until a dog ran out in front of me on Xmas Eve, 1991
Current bikes
2010 CB1300 back on a bike after 19 years, two divorces, children grown up etc
1980 GL1100 NOW ON THE ROAD, still use CB1300.
- gltriker
- Honored Life Member
- Posts: 5063
- Joined: Fri Sep 24, 2010 9:11 pm
- Location: central NY State
Re: New Mixture Screws
Cliff (74yrs )
Keep your eyes and ears open and you'll learn something new, everyday.
New users please visit our "Shop Talk" for common tips and help: <---jdvorchak
http://www.ngwclub.com/forum/page/ST
^^^^^^^click up here^^^^^
RE: a thorough fuel tank cleaning
"And your carbs will thank you. They no longer live down stream from a sewage plant." -gregforesi
"Can't see the paint when your looking thru the handlebars..........." -Oldewing
"I'd rather Ride than Shine" -RAT Me Too!!
Cliff
'75 GL1000 home built trike; http://www.ngwclub.com/forum/viewtopic.php?f=30&t=39996
October,2017 BOTM 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.
Keep your eyes and ears open and you'll learn something new, everyday.
New users please visit our "Shop Talk" for common tips and help: <---jdvorchak
http://www.ngwclub.com/forum/page/ST
^^^^^^^click up here^^^^^
RE: a thorough fuel tank cleaning
"And your carbs will thank you. They no longer live down stream from a sewage plant." -gregforesi
"Can't see the paint when your looking thru the handlebars..........." -Oldewing
"I'd rather Ride than Shine" -RAT Me Too!!
Cliff
'75 GL1000 home built trike; http://www.ngwclub.com/forum/viewtopic.php?f=30&t=39996
October,2017 BOTM 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.
- 5speed
- Honored Life Member
- Posts: 5315
- Joined: Sat Jul 11, 2015 2:37 pm
- Location: Nova Scotia Canada
Re: New Mixture Screws
1982 1100 standard. (sold)
1986 Yamaha FJ1200
2000 Yamaha Roadstar
1976 GoldWing. running but not on the road
1978 Goldwing. future cafe project.
2019 Can-Am ryker (boss's new ride)
2002 Shadow American Classic(sold)
1983 Shadow 500. (sold)
1986 Yamaha FJ1200
2000 Yamaha Roadstar
1976 GoldWing. running but not on the road
1978 Goldwing. future cafe project.
2019 Can-Am ryker (boss's new ride)
2002 Shadow American Classic(sold)
1983 Shadow 500. (sold)
- desertrefugee
- SUPER BIKER!!!!
- Posts: 3947
- Joined: Fri Nov 11, 2011 9:33 pm
- Location: Chandler, AZ, USA
Re: New Mixture Screws
What was wrong with the old screws?
- Life is not about waiting for the storms to pass. It's about learning to ride in the rain.
- chewy999
- SUPER BIKER!!!!
- Posts: 3214
- Joined: Tue Oct 16, 2012 11:21 am
- Location: Haddenham, Cambs, UK
Re: New Mixture Screws
From what I could see, probably not a lot. It was one of those jobs I just wanted to do, like my posts saying I changed the coils and spark units. Each job I do does seem to improve things, but not sure why. I will say that my bike seems to idle a lot better now, but still above 1200 rpm, or it just stalls.desertrefugee wrote:What was wrong with the old screws?
Previous Rides,
1980 CB250N Good to learn on
1981 CX500 good mid range tourer, went to Austria on it!
1983 GL1100C Pride and joy, sold when I bought my 1st house, big mistake
1985 GL650 Silverwing another mistake, horrible bike
1986 CBX550 Good commuter
1989 Suzuki GS750 (1976) cheap and cheerful until a dog ran out in front of me on Xmas Eve, 1991
Current bikes
2010 CB1300 back on a bike after 19 years, two divorces, children grown up etc
1980 GL1100 NOW ON THE ROAD, still use CB1300.
1980 CB250N Good to learn on
1981 CX500 good mid range tourer, went to Austria on it!
1983 GL1100C Pride and joy, sold when I bought my 1st house, big mistake
1985 GL650 Silverwing another mistake, horrible bike
1986 CBX550 Good commuter
1989 Suzuki GS750 (1976) cheap and cheerful until a dog ran out in front of me on Xmas Eve, 1991
Current bikes
2010 CB1300 back on a bike after 19 years, two divorces, children grown up etc
1980 GL1100 NOW ON THE ROAD, still use CB1300.
- mikenixon
- Early 'Wing Guru
- Posts: 997
- Joined: Thu Dec 10, 2009 1:51 am
- Location: Prescott, AZ
- Contact:
Re: New Mixture Screws
chewy999 -- Try 2 1/2 turns, even 3 since you likely have some internal issues as hinted at by your mention of your performance. But no further.
Mike Nixon
www.motorcycleproject.com
https://www.motorcycleproject.com/text/ ... _carb.html
https://youtu.be/CDnzwDWhN24
https://www.motorcycleproject.com/text/lies_ether.html
www.motorcycleproject.com
https://www.motorcycleproject.com/text/ ... _carb.html
https://youtu.be/CDnzwDWhN24
https://www.motorcycleproject.com/text/lies_ether.html
- RB
- Honored Life Member
- Posts: 4268
- Joined: Sun Apr 29, 2007 7:26 am
- Location: AZ
Re: New Mixture Screws
Yep, should idle at well under 1200 like around 950..I'd say you have idle jet issues..
98 1500 SE..
99 1500 SE SOLD
97 SE 1500 SOLD
83 SOLD
82 REBUILT sold!!!
81 DAILY RIDER sold her ((!
81 REBUILT SOLD!!!
81 REBUILT SOLD!!
80 REBUILT SOLD
79 IN BASKET PARTS FOR SALE
79 CLEANED UP AND SOLD
78 REBUILT SOLD
77 REBUILT SOLD
76 SOLD/PARTIAL REBUILD
76 REBUILT AND SOLD
75 REBUILT SOLD
75 REBUILT SOLD
75 REBUILD SOLD
FAIR WINDS,
RB
99 1500 SE SOLD
97 SE 1500 SOLD
83 SOLD
82 REBUILT sold!!!
81 DAILY RIDER sold her ((!
81 REBUILT SOLD!!!
81 REBUILT SOLD!!
80 REBUILT SOLD
79 IN BASKET PARTS FOR SALE
79 CLEANED UP AND SOLD
78 REBUILT SOLD
77 REBUILT SOLD
76 SOLD/PARTIAL REBUILD
76 REBUILT AND SOLD
75 REBUILT SOLD
75 REBUILT SOLD
75 REBUILD SOLD
FAIR WINDS,
RB
- chewy999
- SUPER BIKER!!!!
- Posts: 3214
- Joined: Tue Oct 16, 2012 11:21 am
- Location: Haddenham, Cambs, UK
Re: New Mixture Screws
Thanks for the advice Mike. Will do!mikenixon wrote:chewy999 -- Try 2 1/2 turns, even 3 since you likely have some internal issues as hinted at by your mention of your performance. But no further.
Previous Rides,
1980 CB250N Good to learn on
1981 CX500 good mid range tourer, went to Austria on it!
1983 GL1100C Pride and joy, sold when I bought my 1st house, big mistake
1985 GL650 Silverwing another mistake, horrible bike
1986 CBX550 Good commuter
1989 Suzuki GS750 (1976) cheap and cheerful until a dog ran out in front of me on Xmas Eve, 1991
Current bikes
2010 CB1300 back on a bike after 19 years, two divorces, children grown up etc
1980 GL1100 NOW ON THE ROAD, still use CB1300.
1980 CB250N Good to learn on
1981 CX500 good mid range tourer, went to Austria on it!
1983 GL1100C Pride and joy, sold when I bought my 1st house, big mistake
1985 GL650 Silverwing another mistake, horrible bike
1986 CBX550 Good commuter
1989 Suzuki GS750 (1976) cheap and cheerful until a dog ran out in front of me on Xmas Eve, 1991
Current bikes
2010 CB1300 back on a bike after 19 years, two divorces, children grown up etc
1980 GL1100 NOW ON THE ROAD, still use CB1300.
- chewy999
- SUPER BIKER!!!!
- Posts: 3214
- Joined: Tue Oct 16, 2012 11:21 am
- Location: Haddenham, Cambs, UK
Re: New Mixture Screws
Undid the screw another 1/2 turn, then another, so three turns altogether, and each time set the revs to 1000 rpm. When the bike had warmed up, seemed ok, but wouldn't say it was comfortable, if you know what I mean, but it kept running. 1000 rpm is within limits according to my (Haynes) manual.
One thing I noticed was that with each screw set at 3 turns, you could see the end of the screw at the entry point, didn't notice that with the old ones, so does that sound right?
Finally, which is the idle jets on the diagram in post #1? May consider changing those too.
One thing I noticed was that with each screw set at 3 turns, you could see the end of the screw at the entry point, didn't notice that with the old ones, so does that sound right?
Finally, which is the idle jets on the diagram in post #1? May consider changing those too.
Previous Rides,
1980 CB250N Good to learn on
1981 CX500 good mid range tourer, went to Austria on it!
1983 GL1100C Pride and joy, sold when I bought my 1st house, big mistake
1985 GL650 Silverwing another mistake, horrible bike
1986 CBX550 Good commuter
1989 Suzuki GS750 (1976) cheap and cheerful until a dog ran out in front of me on Xmas Eve, 1991
Current bikes
2010 CB1300 back on a bike after 19 years, two divorces, children grown up etc
1980 GL1100 NOW ON THE ROAD, still use CB1300.
1980 CB250N Good to learn on
1981 CX500 good mid range tourer, went to Austria on it!
1983 GL1100C Pride and joy, sold when I bought my 1st house, big mistake
1985 GL650 Silverwing another mistake, horrible bike
1986 CBX550 Good commuter
1989 Suzuki GS750 (1976) cheap and cheerful until a dog ran out in front of me on Xmas Eve, 1991
Current bikes
2010 CB1300 back on a bike after 19 years, two divorces, children grown up etc
1980 GL1100 NOW ON THE ROAD, still use CB1300.
- robin1731
- Membership Admin
- Posts: 21729
- Joined: Mon May 29, 2006 8:31 am
- Location: Decatur, Indiana
Re: New Mixture Screws
Number 22.chewy999 wrote:snip........................
But what year carbs are you working on? 80-81 had press in jets. 82-83 had screw in jets.
.
1976 Goldwing Super Sport
1985 Honda Elite
1976 KZ900 Dragbike
1992 ZX7 Dragbike (KZ900 style motor w/NOS)
and a rotation of various purchases
Randakk approved Carb Rebuilder
1985 Honda Elite
1976 KZ900 Dragbike
1992 ZX7 Dragbike (KZ900 style motor w/NOS)
and a rotation of various purchases
Randakk approved Carb Rebuilder
- chewy999
- SUPER BIKER!!!!
- Posts: 3214
- Joined: Tue Oct 16, 2012 11:21 am
- Location: Haddenham, Cambs, UK
Re: New Mixture Screws
Without checking, I believe they are 1980 -81 carbs.robin1731 wrote:Number 22.chewy999 wrote:snip........................
But what year carbs are you working on? 80-81 had press in jets. 82-83 had screw in jets.
.
Previous Rides,
1980 CB250N Good to learn on
1981 CX500 good mid range tourer, went to Austria on it!
1983 GL1100C Pride and joy, sold when I bought my 1st house, big mistake
1985 GL650 Silverwing another mistake, horrible bike
1986 CBX550 Good commuter
1989 Suzuki GS750 (1976) cheap and cheerful until a dog ran out in front of me on Xmas Eve, 1991
Current bikes
2010 CB1300 back on a bike after 19 years, two divorces, children grown up etc
1980 GL1100 NOW ON THE ROAD, still use CB1300.
1980 CB250N Good to learn on
1981 CX500 good mid range tourer, went to Austria on it!
1983 GL1100C Pride and joy, sold when I bought my 1st house, big mistake
1985 GL650 Silverwing another mistake, horrible bike
1986 CBX550 Good commuter
1989 Suzuki GS750 (1976) cheap and cheerful until a dog ran out in front of me on Xmas Eve, 1991
Current bikes
2010 CB1300 back on a bike after 19 years, two divorces, children grown up etc
1980 GL1100 NOW ON THE ROAD, still use CB1300.
- mikenixon
- Early 'Wing Guru
- Posts: 997
- Joined: Thu Dec 10, 2009 1:51 am
- Location: Prescott, AZ
- Contact:
Re: New Mixture Screws
There is a rather involved explanation for why 3 turns. But I'll shorten it. Basically, a perfect GL1100 will work fine at 1 1/2+. But 2 1/2 is needed in bikes with engines that have never been rebuilt. And 3 turns is useful for engines that have not been rebuilt *and* whose carbs' idle circuits are not completely clear. Oh, and at 3 turns you are at the limit of the spring's ability to keep tension, so though you may be tempted, go no further. And, consider this 2 1/2 to 3 turns a band aid fix, a workaround. You can keep the adjustment if you like, and many do, but everyone should know that it is making up for other issues.chewy999 wrote:Undid the screw another 1/2 turn, then another, so three turns altogether, and each time set the revs to 1000 rpm. When the bike had warmed up, seemed ok, but wouldn't say it was comfortable, if you know what I mean, but it kept running. 1000 rpm is within limits according to my (Haynes) manual.
One thing I noticed was that with each screw set at 3 turns, you could see the end of the screw at the entry point, didn't notice that with the old ones, so does that sound right?
Finally, which is the idle jets on the diagram in post #1? May consider changing those too.
The idle jet is pressed in before 1982, but you should still make an effort to remove it. This is done by carefully threading its head (only 4mm deep) and jacking the jet out. Once you get the jet out, you will be glad you removed it. Rust, varnish, all kinds of crud will be packed in and around at least some of them, if not all. You can reinstall the same jets once cleaned and vetted with a guitar string.
Mike Nixon
www.motorcycleproject.com
https://www.motorcycleproject.com/text/ ... _carb.html
https://youtu.be/CDnzwDWhN24
https://www.motorcycleproject.com/text/lies_ether.html
www.motorcycleproject.com
https://www.motorcycleproject.com/text/ ... _carb.html
https://youtu.be/CDnzwDWhN24
https://www.motorcycleproject.com/text/lies_ether.html
- chewy999
- SUPER BIKER!!!!
- Posts: 3214
- Joined: Tue Oct 16, 2012 11:21 am
- Location: Haddenham, Cambs, UK
Re: New Mixture Screws
Thanks Mike for the info. I did look at the overhaul procedure for 1100 carbs in the Guru's corner, and there is a link to a video showing how to remove the pressed in idle jets. I appreciate you saying I should try to remove them to clean them properly, but I can predict exactly what will happen.
The first one will fall out, the next two will come out with a little force as per the video, but the last one will be stuck as if it were welded in place! That will then end up wrecked with no replacement available!
Now the riding season is here, going to leave it for now, but then have a rethink for the Winter projects.
The first one will fall out, the next two will come out with a little force as per the video, but the last one will be stuck as if it were welded in place! That will then end up wrecked with no replacement available!
Now the riding season is here, going to leave it for now, but then have a rethink for the Winter projects.
Previous Rides,
1980 CB250N Good to learn on
1981 CX500 good mid range tourer, went to Austria on it!
1983 GL1100C Pride and joy, sold when I bought my 1st house, big mistake
1985 GL650 Silverwing another mistake, horrible bike
1986 CBX550 Good commuter
1989 Suzuki GS750 (1976) cheap and cheerful until a dog ran out in front of me on Xmas Eve, 1991
Current bikes
2010 CB1300 back on a bike after 19 years, two divorces, children grown up etc
1980 GL1100 NOW ON THE ROAD, still use CB1300.
1980 CB250N Good to learn on
1981 CX500 good mid range tourer, went to Austria on it!
1983 GL1100C Pride and joy, sold when I bought my 1st house, big mistake
1985 GL650 Silverwing another mistake, horrible bike
1986 CBX550 Good commuter
1989 Suzuki GS750 (1976) cheap and cheerful until a dog ran out in front of me on Xmas Eve, 1991
Current bikes
2010 CB1300 back on a bike after 19 years, two divorces, children grown up etc
1980 GL1100 NOW ON THE ROAD, still use CB1300.
- robin1731
- Membership Admin
- Posts: 21729
- Joined: Mon May 29, 2006 8:31 am
- Location: Decatur, Indiana
Re: New Mixture Screws
But if the pilots are plugged, they usually are, it will never run right. Follow the procedure Mike suggested and they come out pretty nicely. That is the way I do them.
.
.
1976 Goldwing Super Sport
1985 Honda Elite
1976 KZ900 Dragbike
1992 ZX7 Dragbike (KZ900 style motor w/NOS)
and a rotation of various purchases
Randakk approved Carb Rebuilder
1985 Honda Elite
1976 KZ900 Dragbike
1992 ZX7 Dragbike (KZ900 style motor w/NOS)
and a rotation of various purchases
Randakk approved Carb Rebuilder
- Track T 2411
- Honored Life Member
- Posts: 8519
- Joined: Thu May 29, 2008 9:37 pm
- My Album: http://www.ngwclub.com/gallery/v/wingmans/Track+T+2411/
- Location: Prairie du Sac Wisconsin
Re: New Mixture Screws
I did this on my last set, and it worked nicely. Are there replacement o-rings available for these jets?
"I have no special talent. I am only passionately curious." - Albert Einstein
"He that is good with a hammer tends to think everything is a nail" - Abraham Maslow
"If you can't take the time to do it right the first time, how are you ever going to find the time to do it over?" -Unknown
Current Rides:
'Grumpy' - '81 Standard, now fully dressed.
'Layla' - '81 Standard w/dealer installed fairing and Hondaline bags.
'Scarlett' '76 'Survivor' nekkid as a j-bird!
Under Construction:
The 'Jalopy' '78-'79 Mash-up
'Quikie' '81 gl1100I back on the lift, project with the step-son!
In The Shed:
'81 gl1100I barn find aka "Josie, the farmer's daughter." (almost comatose build)
'77 gl1000, roller parts bike.
'82 gl1100I, 'Old Crusty' titled roller parts bike (free!)
'82 gl1100I, My first 'Wing, and an expensive lesson!
New2U Bike? Read Me.
"He that is good with a hammer tends to think everything is a nail" - Abraham Maslow
"If you can't take the time to do it right the first time, how are you ever going to find the time to do it over?" -Unknown
Current Rides:
'Grumpy' - '81 Standard, now fully dressed.
'Layla' - '81 Standard w/dealer installed fairing and Hondaline bags.
'Scarlett' '76 'Survivor' nekkid as a j-bird!
Under Construction:
The 'Jalopy' '78-'79 Mash-up
'Quikie' '81 gl1100I back on the lift, project with the step-son!
In The Shed:
'81 gl1100I barn find aka "Josie, the farmer's daughter." (almost comatose build)
'77 gl1000, roller parts bike.
'82 gl1100I, 'Old Crusty' titled roller parts bike (free!)
'82 gl1100I, My first 'Wing, and an expensive lesson!
New2U Bike? Read Me.
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