GL1100 Carbs on my GL1000 looking for advise...

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Earthwing
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GL1100 Carbs on my GL1000 looking for advise...

#1

Post by Earthwing »

I have recently learned after starting a thread over in the restoration forum that my bike (1976 GL1000) has GL1100 carbs on it (I haven't checked the codes on the carbs that are on it just yet).

I have dug around a bit and I'm feeling like this isn't the best thing for me to run on this bike and I feel inclined to source a set of the original 758A carbs.

I'd like to understand the pros/cons of keeping what I have versus swapping them out for originals?

Thanks!
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Oldewing
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Re: GL1100 Carbs on my GL1000 looking for advise...

#2

Post by Oldewing »

IF you're looking to keep her stock, then 1000 are the way.

If you are wanting a rider, I like the 1100 swap, and have done it many times. You give up some top end, like maybe 5 mph. but gain improved rideability and easier start ups. JMHO :crosso :crosso :crosso
82 GL1100 Interstate-Oldewing October 23 BOTM
06 GL1800 Road bike, as in Rode alot...
Sometimes I wrestle with my inner demons.........
Other times we just hug.......

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Whiskerfish
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Re: GL1100 Carbs on my GL1000 looking for advise...

#3

Post by Whiskerfish »

Yep what he said. Some folks are very happy with the switch, others not so much. Depends on what you want from your ride. The accelerator pump function on the 1100 carbs is often is reported as a improvement for starting and mid-range acceleration but there is some top end sacrifice.
"Agreement is not a requirement for Respect" CDR Michael Smith USN (Ret) 2017
"The book is wrong, this whole Conclusion is Fallacious" River Tam
2008 GL1800 IIIA "TH3DOG"
1975/6/7/8/9 Arthur Fulmer Dressed Road bike
1975 Naked Noisy and Nasty in town bike
and a whole garage full of possibilities!!

Psst. oh and by the way CHANGE YOUR BELTS!!!!
Shadowjack
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Re: GL1100 Carbs on my GL1000 looking for advise...

#4

Post by Shadowjack »

All of you who have run their bikes at the top end in the last month or two, hold up your hand. I'll wait.
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Whiskerfish
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Re: GL1100 Carbs on my GL1000 looking for advise...

#5

Post by Whiskerfish »

Me.
"Agreement is not a requirement for Respect" CDR Michael Smith USN (Ret) 2017
"The book is wrong, this whole Conclusion is Fallacious" River Tam
2008 GL1800 IIIA "TH3DOG"
1975/6/7/8/9 Arthur Fulmer Dressed Road bike
1975 Naked Noisy and Nasty in town bike
and a whole garage full of possibilities!!

Psst. oh and by the way CHANGE YOUR BELTS!!!!
redglbx
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Re: GL1100 Carbs on my GL1000 looking for advise...

#6

Post by redglbx »

🖖🏻🖖🏻🖖🏻 !

Just kidding ! I have 1100 carbs on my 76 as well, stock 1100’s tend to not want to rev past 7-7500rpm which is the top end loss mentioned above. The stock 758’s when properly done will simply outperform the 1100’s, when properly setup ! But the 1100 accelerator pump circuit does cover up a lot of flaws, the unwillingness to rev can be improved by reducing the main jets from the stock #145’s to 140’s.

My 1100’s on my 76 have been highly modified and simply outperform the oe’s a bunch but I have at least 40 hours of machine work in them to get there and I run # 138 main jets, they work very well !

My 1100 journey started many years ago amid lots of people claiming that 1100 carbs would allow the GL1000’s to pull wheelies at will, get 100mpg , give you whiter teeth and an improved sex life,,,,,,, all pure BS ! Which is where I started my 1100 journey to find the truth.

As stated stock 1100’s give you less performance, both hp & Tq but rideability is much improved which is why people thought they have improved performance (pure bs) but if you do reduce the main jets to 140’s and set them up correctly you will have a very nice riding and performing Gl. My .02

On the top end thing, many years ago when I bought my 76 new, Honda was saying that the GL would cruise at 132mph all day long (a durability claim I believe) so I woke up one morning with the intent to find out how fast it would indeed go (I used to have a top end thing when I was younger). We had a freshly built and very lightly used by-pass around South Bend that I used.

So I took it out and rev’d to redline-in each gear and I found that being freshly tuned and all gave me the ability to see around 125mph in 5th but would not rev to redline at all, dropping back to 4th gear allowed me to rev to redline at around 132mph all with the stock everything. Stock 1100 carbs wouldn’t get there, with all the mods I’ve done to my 76 it will now probably pull redline in 5th but the current rider no longer has the willingness or cares along with a place to do it and survive. Also I now have a 16” rear wheel/tire which gives me a bit of a gearing advantage but does reduce top end as well.
Red 1976 oe owner
1976 LTD restored
1980 CBX , in the que, to fix the ignorant heavy handed owner
1981 CBX
1977 CB750 K7
2014 FJR OE owner, sold
1980 GL1100
1984 GL1200 naked
1969 CL350, in the que
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tlbranth
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Re: GL1100 Carbs on my GL1000 looking for advise...

#7

Post by tlbranth »

Red: without modification, would 1100 carbs give my '75 a mileage boost?
Terry
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1999 GL1500 SE
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1975 GL1000
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Lucien Harpress
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Re: GL1100 Carbs on my GL1000 looking for advise...

#8

Post by Lucien Harpress »

My opinion? Keep what you've got for now, including rebuild kit if necessary, get the bike together, get it running, and ride it a bit. You can always swap carbs later if the mood strikes you. That way if you do decide to go full stock (and believe me, I'm usually a purist when it comes to these things) it gives you time to potentially find a great deal on a set of 1000 carbs. But in the meantime you've got something to ride.

As someone who spends way too much time wrenching and not riding, it's easy to get lost in the weeds of just "fixing stuff". :)
1997 Valkyrie- Light Cutomization, but Too Busy Riding
1980 KZ1300- Bike's Haunted
1976 GL1000 (Yellow)- It Runs (Poorly) and Doesn't Leak (Mostly)
1974 Velosolex 3800- Better Than Walking
1972 CB750- Broke the Chain And Ate the Motor
1969 CT90- The Most Fun You Can Have on 90ccs.
1965 CA77 Dream- Needs a Full Teardown, but Complete

All advice I give is only valid until an expert corrects me.
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Oldewing
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Re: GL1100 Carbs on my GL1000 looking for advise...

#9

Post by Oldewing »

Shadowjack wrote: Mon Aug 01, 2022 8:18 am All of you who have run their bikes at the top end in the last month or two, hold up your hand. I'll wait.
I am in...abit on my 1800.

A long gone 78 I had, stock carbs topped at 131 via GPS.
82 GL1100 Interstate-Oldewing October 23 BOTM
06 GL1800 Road bike, as in Rode alot...
Sometimes I wrestle with my inner demons.........
Other times we just hug.......

Team 898
Team LTD 993
Team 76 R2B3
And always remember: beer has some food value--but food has NO beer value...
Earthwing
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Re: GL1100 Carbs on my GL1000 looking for advise...

#10

Post by Earthwing »

Thank you everyone, I’ve decided to take the advice to work with the 1100 carbs for now and get it running.

I pulled the carbs today and will be posting the progress and pics in the restoration forum.

Steve
redglbx
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Re: GL1100 Carbs on my GL1000 looking for advise...

#11

Post by redglbx »

tlbranth wrote: Mon Aug 01, 2022 12:58 pm Red: without modification, would 1100 carbs give my '75 a mileage boost?
Terry, not in my opinion, in fact due to the accelerator pump may be slightly worse. You can get a mileage improvement (slight) and slight performance improvement with just rejetting your 1000 carbs.

I found on a dyno that the following gave the best overall results,

Idle jets-stock #35
Primary mains - #65 (stock #62)
Secondary mains- #115 (stock #120)
Low speed air jets in the brass elbows - #110 (stock are 120’s I think)

I have found this setup to give the best overall ride ability and with a judicious right hand a mileage improvement, keeping rpm under 4K as much as possible is a big key. My red 76 had this setup before I did the 1100 carb conversion and my 76LTD still has this setup, runs terrific when I indeed run it and routinely gets high 40s mpg to low 50’s.

On the dyno with my red 76 this setup smoothed the fuel curve considerably and gave me a overall power increase,,,, but still not going to give you whiter teeth or an improved love life but it did run better. By the way I bought the replacement jets from PJ’s Motorsports but others have bought jets from other sources as well. Hope this helps
Red 1976 oe owner
1976 LTD restored
1980 CBX , in the que, to fix the ignorant heavy handed owner
1981 CBX
1977 CB750 K7
2014 FJR OE owner, sold
1980 GL1100
1984 GL1200 naked
1969 CL350, in the que
Shadowjack
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Re: GL1100 Carbs on my GL1000 looking for advise...

#12

Post by Shadowjack »

Don't you guys that are running at top end get a burning sensation in the region of your driver's license?
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Whiskerfish
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Re: GL1100 Carbs on my GL1000 looking for advise...

#13

Post by Whiskerfish »

Shadowjack wrote: Tue Aug 02, 2022 8:16 am Don't you guys that are running at top end get a burning sensation in the region of your driver's license?
Oh it is definitely a risk. I try to be cautious and know most of the LEO hiding spots in my area. I generally only push when I am confident the area is clear and safe from any other drivers or cross traffic. Usually on the thruway when I have a long opening in front of me or out in the country when I can see a long way. I started riding in 75 and in the years since I have been pulled over 3 times while running really fast. All three I was let go. A lot matters on how you treat the Officer and accept responsibility.
"Agreement is not a requirement for Respect" CDR Michael Smith USN (Ret) 2017
"The book is wrong, this whole Conclusion is Fallacious" River Tam
2008 GL1800 IIIA "TH3DOG"
1975/6/7/8/9 Arthur Fulmer Dressed Road bike
1975 Naked Noisy and Nasty in town bike
and a whole garage full of possibilities!!

Psst. oh and by the way CHANGE YOUR BELTS!!!!
redglbx
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Re: GL1100 Carbs on my GL1000 looking for advise...

#14

Post by redglbx »

Yepper, I’ve slowed down a bunch, particularly since my back reconstruction last year, but the absolute worst I’ve ever done was when I was 16-17yrs old and I had a serious penchant to go as fast as possible. I had a highly modified 68 Camero that I used to just love to wind it out. On one particular foray on the new lightly used (at that time) bypass around South Bend I was just getting it, when I noticed a State Trooper going the other way and his lights came on (oh shite !) luckily the highway was divided with no openings so I just stayed in it and went to a friends about 25mi south of town to let things cool off for a few hours.

So I came home sometime later only to see the troopers car in the driveway (oh shite !) ,, I went in and my Dad said to be quiet & sit down (they didn’t know the details yet) at which point the trooper started to explain that he had clocked me on his Vascar at 173mph, at which point my Dad jumped straight up out of his chair with a string of words I really didn’t hear, the trooper continued that he should ticket me and impound the car but he didn’t figure that a judge would believe it & would simply question his Vascar. Luckily (I guess) the trooper (really nice guy!) went to church with us and was good friends with my mom & dad.

So as my dad was on a major rant he just smirked finished his coffee and left,, the following 6 months saw no use of my Camaro and was really tense with my dad. I also gained a couple of guardian angels because everytime I looked in my rear view mirror it seemed like that troopers car was there Or a friend of his that was a South Bend City cop. I always seemed to have a escort and seemed to get pulled over regularly but usually no ticket or just for excessive noise from the exhaust or tires. I feel very lucky ! Ahh the good ol’days 🤔🤔😱😜

The fastest I’ve been in recent years was 132mph indicated on my 14 Yamaha FJR while passing a long line of cars, on anything else I tend to TRY to keep it under a hundred. I will say that since I’ve modified my red 76 I would love to be able to take it out on a controlled area and see just how fast it will go now, I do believe it would pull redline in 5th now,,, pretty sure I think! But now after the back reconstruction just being able to ride is a major accomplishment & source of joy !
Red 1976 oe owner
1976 LTD restored
1980 CBX , in the que, to fix the ignorant heavy handed owner
1981 CBX
1977 CB750 K7
2014 FJR OE owner, sold
1980 GL1100
1984 GL1200 naked
1969 CL350, in the que
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dontwantapickle
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Re: GL1100 Carbs on my GL1000 looking for advise...

#15

Post by dontwantapickle »

redglbx wrote: Tue Aug 02, 2022 10:22 am I will say that since I’ve modified my red 76 I would love to be able to take it out on a controlled area and see just how fast it will go now,
It just so happens that there IS a place you can truly and accurately test your bikes top speed.
Bonneville !
Screw the butt dyno and speculation... Get an official timing slip and be able to prove how fast your bike is.
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