Carburetors

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BurnsYoFace34
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Re: Carburetors

#31

Post by BurnsYoFace34 »

Im pretty sure its just the carbs outa sync I bought a sync tool so hopefully thiss weekend I can get them syncd
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Re: Carburetors

#32

Post by redglbx »

Gl1100 carbs vs Gl1000 carbs,,,, , there is a noticeable difference, if you don’t care about performance at all or an ability to rev over 6500rpm then yes 1100carbs May be for you. They are better than the single carb conversions especially the vw or stromberg version that’s just terrible imho. 1100 carbs only have 1 accelerated pump that does provide better drive ability in the lower rpm ranges. They do have 4 air cutoff valves that are expensive to replace.

If you decide to stay with 1000 carbs keep in mind that the 75-77’s are the biggest and provide the biggest performance if setup properly. Just always use the same number carbs for all 4, don’t mix & match, that’s a bad idea. I have found that Mike Nixon’s and Randakks assessments that properly setup 1000 carbs will outperform most anything else. My .02

A simple test that I have used on my hot rod car engines to provide the correctly sized carbs for them is to hook a vacuum gauge up to a manifold vacuum source and monitor/watch it up to redline. preferably it will maintain under 1/2in of vacuum under full throttle up to redline, if it does you should be good on size,then it’s just a matter of getting the jetting right. And like I’ve said before, all Honda carbs that I’ve tested are extremely lean on the idle/intermediate jetting and extremely rich on the secondary jetting. Flatten that fuel curve out and you’ll get the very best you can out of those carbs. There’s no magic pill here, ya got do the work, make them spotlessly clean and correct the jetting. Hope this helps
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robin1731
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Re: Carburetors

#33

Post by robin1731 »

I have to say this. I've ridden a few GL1000's with GL1100 carbs. They ran fine. Pulled to redline easily. Everything stock. 1000 carbs are still the better way to go but they'll run fine with 1100 carbs.
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Re: Carburetors

#34

Post by Rat »

And start easily …

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Re: Carburetors

#35

Post by redglbx »

Well Robin, my experience’s not to disagree is that every 1100 carb equipped 1000 that I’ve ever had the pleasure to ride would be noticeably flat at 6500 and above, now with that said the funny thing is that even 1100 bikes don’t pull clean in the upper ranges. Now the really funny part of it us that once I reduced the 145 main jet down to a 140 jet it pulls much better, not quite sure why that is, you would think that it would happen if it was lean but not really rich... Anyway that’s been my experience.

I will have to agree with Gord though in that the 1100’s do seem to start better and the accelerator pump tends to cover up a lot of short comings. But again a well sorted set of 1000 carbs WILL work just about perfectly and WILL kick the snot out of an same equipped bike with 1100 carbs on it. Just the way it is. Honda did size the 75-77 carbs about perfectly on them, they really don’t offer any improvement with bigger carbs.
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1980 CBX , in the que, to fix the ignorant heavy handed owner
1981 CBX
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1980 GL1100
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Re: Carburetors

#36

Post by digger »

Mike Nixon recommends defeating the air cut-off valves because they are expensive and it won’t hurt anything to do so. viewtopic.php?f=54&t=67126

Regarding the accelerator pump, yes there is only one pump but it feeds all four carburetors, same as two barrel car carburetors, one pump feeds both barrels.

As Robin has said, I too have ridden a 78 GL1000 quite a bit (my brother’s) and it is very tractable and will pull to redline easily, not as quick as my 75 but still runs good. It has stock jets by the way.
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Re: Carburetors

#37

Post by redglbx »

I guess I should clarify 1 thing I said, when I said that a 1000 equipped with 1100 carbs would not rev to redline that is technically incorrect, my statement sounds like it will rev to around 6500 rpm and stop which is technically not correct, it will rev more quickly to 6500-6800 and then more slowly to 8500 but it will pull redline if you stay in it, just not as quickly.

Now on MY 76 it would rev but painfully slow above 6500 which was more pronounced than others I’ve ridden, but that was initially with stock 1100 carbs. But my 76 at that time had the heads/intakes ported & polished as well as having the heads milled .040in and the cams advanced +4 degrees which should give a much stronger signal to the carbs so that may account for some of it on my bike. But just the same all the 1000’s I’ve ridden that had 1100 carbs exhibited the slower reving to redline. Single carb conversions were more pronounced that way. After all the modification I did which involved a lot of machine work to increase the airflow through the smaller stock bore 1100’s that must exceed the oe 1000’s because it picked up a bunch of mph on my measured test strip with the highly modified 1100’s but was much slower on the same test strip with the stock 1100’s vs the 1000’s.

But the thing here that should always be followed is that it’s you bike & your money and if it makes you smile do what you want !
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
BurnsYoFace34
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Re: Carburetors

#38

Post by BurnsYoFace34 »

Ok so I have fixed the float post I have taken the carbs of the 77 an taken all jets out an ran carb cleaner threw them to clean them out put back together started it an it just revs right up to 4k rpm with the twist of yhe throttle it will run up to redline but let off the throttle an it drops to 4k an stays there. Now I dont have the push cable installed just the pull cable an to me I thoughy it has enough snap back from the spring to not need the push cable am I wrong about that ?
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Re: Carburetors

#39

Post by gltriker »

BurnsYoFace34 wrote: Wed Apr 27, 2022 3:40 pm Ok so I have fixed the float post I have taken the carbs of the 77 an taken all jets out an ran carb cleaner threw them to clean them out put back together started it an it just revs right up to 4k rpm with the twist of yhe throttle it will run up to redline but let off the throttle an it drops to 4k an stays there. Now I dont have the push cable installed just the pull cable an to me I thoughy it has enough snap back from the spring to not need the push cable am I wrong about that ?
Now, Use the synchronizing tool you talked about tumb2

"Im pretty sure its just the carbs outa sync I bought a sync tool so hopefully this weekend I can get them syncd"

Here's just òne of many articles for that procedure
https://www.randakksblog.com/carb-synch ... /#more-383
Last edited by gltriker on Mon May 02, 2022 8:17 am, edited 3 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
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^^^^^^^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 ;)
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'75 GL1000 home built trike; http://www.ngwclub.com/forum/viewtopic.php?f=30&t=39996
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previous rides:
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Re: Carburetors

#40

Post by Fred Camper »

Seems like a puck may be sticking on the post, not the outside shinney side. But 4000 is pretty high for only one stuck puck so it may be something else letting in the air.
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BurnsYoFace34
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Re: Carburetors

#41

Post by BurnsYoFace34 »

Does anyone know where to get more air attachments for the sync tool mine came with 4 threaded tubes but only 2 of the 4 screw into the intakes (SNIP) stupid or what size thread they are could in use like a grease fitting

Edited for Language Whiskerfish
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gltriker
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Re: Carburetors

#42

Post by gltriker »

5mm is the correct thread size

Google for similar results with these words?

Adapter Kit - Vacuum Carb Sync - 5mm

Note: I will advise you to NOT get the permanent install type adapters with a rubber cap.
If a slight backfire is created in the intake elbow, odds are the rubber cap will pop off the adaptor at a high velocity :shock: GONE
and you better have a spare cap along with you to replace it.

Cliff
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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pidjones
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Re: Carburetors

#43

Post by pidjones »

Are you certain that you didn't loose a runner o-ring? They can slip out pretty easily when mounting the rack.
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BurnsYoFace34
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Re: Carburetors

#44

Post by BurnsYoFace34 »

No all 4 runner I rings are there I even put some gasket Silicon around them aswell just in case I think the carbs are just way outa sync i got the adapters yesterday so here soon I'll be doin a carb sync
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gltriker
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Re: Carburetors

#45

Post by gltriker »

BurnsYoFace34 wrote: Wed Apr 27, 2022 3:40 pm snip- started it an it just revs right up to 4k rpm with the twist of yhe throttle it will run up to redline but let off the throttle an it drops to 4k an stays there.
BurnsYoFace34 wrote: Mon May 02, 2022 8:12 am No all 4 runner I rings are there I even put some gasket Silicon around them as well just in case I think the carbs are just way outa sync i got the adapters yesterday so here soon I'll be doin a carb sync

Were you successful to eventually get it under control with your synchronizing equipment ?
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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