synchronizing gl1000 carbs

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leonardhcross
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synchronizing gl1000 carbs

#1

Post by leonardhcross »

Hello NGW friends. After several stops and starts, I am now ready to synchronize the carbs on my 76 GL1000. All the suggested prep work has been done. I gave it a shot yesterday and feel pretty good about my progress. But, here is a specific question. When I attach my test guages, I am getting a consistent reading at around 7 on all four. My manual tells me that my reading should be at or near 21. According to the guage, my readings indicate a likely vacuum leak. Playing a propane torch around my intakes had no effect on the idle. I assumed that I had a major leak somewhere. Until I watched this video on YT. This guy seems competent and did a decent job on the video. But, his readings were similar to mine and he went ahead and completed the balance at a reading of 8. Here is the video. Can someone clarify for me? https://www.youtube.com/watch?v=sct7D8JqBno
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gltriker
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Re: synchronizing gl1000 carbs

#2

Post by gltriker »

Disregard (revisit) the manual.
The man in the video is pretty good with presentation. ;)

Vacuum can be measured in more than one unit.

Inches of mercury=in/hg

centimeters of mercury= cm/hg
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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Re: synchronizing gl1000 carbs

#3

Post by leonardhcross »

gltriker wrote: Sat Feb 10, 2024 3:28 pm Disregard (revisit) the manual.
The man in the video is pretty good with presentation. ;)

Vacuum can be measured in more than one unit.

Inches of mercury=in/hg

centimeters of mercury= cm/hg
Thanks for the speedy reply Cliff.
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Re: synchronizing gl1000 carbs

#4

Post by leonardhcross »

What confused me is that, at a reading of 8, the needles in the video are reading in a red zone on the guage which reads ...." late timing or leak at intake manifold".
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pidjones
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Re: synchronizing gl1000 carbs

#5

Post by pidjones »

Gauge ranges are marked for a car. One thing, make sure timing and valve adjustment is perfect before balancing. then set RPM, balance, reset RPM, rebalance. may take a few laps.
"Love 'em all.... let God sort 'em out!"
Ex 2006 GL1800 - the Black Pearl SOLD! to make room for:
2021 Can-Am Spyder RT Limited Dark Chalk Metallic
1975 Red GL1000 project - ex Pistol Pete project
1972 Triumph T150V Trident rescue - finished and FOR SALE!
1976 Yamaha RD400c
1978 GL1000 with '75 engine - the Hunley
Ex 1978 GL1000
Ex 1979 GL1000
Ex '79 CB750F rat bike
Ex '86 SEi
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leonardhcross
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Re: synchronizing gl1000 carbs

#6

Post by leonardhcross »

pidjones wrote: Sun Feb 11, 2024 2:38 pm Gauge ranges are marked for a car. One thing, make sure timing and valve adjustment is perfect before balancing. then set RPM, balance, reset RPM, rebalance. may take a few laps.
Thanks, pidjones. I am not clear about your conclusion that the guage ranges are made for cars. I would assume that "inches of mercury" are "inches of mercury" regardless of what manifold one is tapping into. The Haynes manual says that I should get a vacuum reading of around 21 inches of mercury. The video that I attached shows a reading of 8 inches of mercury which is about what my guages are reading. I will do exactly as you have suggested. Slowly, step-by-step. I am just puzzled about the vacuum readings.
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Re: synchronizing gl1000 carbs

#7

Post by pidjones »

Thanks, pidjones. I am not clear about your conclusion that the guage ranges are made for cars.
[/quote]

The green and orange range labeling is for cars. And please, burn the Haynes manual.
"Love 'em all.... let God sort 'em out!"
Ex 2006 GL1800 - the Black Pearl SOLD! to make room for:
2021 Can-Am Spyder RT Limited Dark Chalk Metallic
1975 Red GL1000 project - ex Pistol Pete project
1972 Triumph T150V Trident rescue - finished and FOR SALE!
1976 Yamaha RD400c
1978 GL1000 with '75 engine - the Hunley
Ex 1978 GL1000
Ex 1979 GL1000
Ex '79 CB750F rat bike
Ex '86 SEi
Ex '77 GL1000
Ex '76 RD400
Ex '72 Penton 125 set up for flat track
Ex '73 RD250
Ex '68 TR6C - chopped
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gltriker
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Re: synchronizing gl1000 carbs

#8

Post by gltriker »

leonardhcross wrote: Mon Feb 12, 2024 12:58 pm
pidjones wrote: Sun Feb 11, 2024 2:38 pm Gauge ranges are marked for a car. One thing, make sure timing and valve adjustment is perfect before balancing. then set RPM, balance, reset RPM, rebalance. may take a few laps.
Thanks, pidjones. I am not clear about your conclusion that the guage ranges are made for cars. I would assume that "inches of mercury" are "inches of mercury" regardless of what manifold one is tapping into. The Haynes manual says that I should get a vacuum reading of around 21 inches of mercury. The video that I attached shows a reading of 8 inches of mercury which is about what my guages are reading. I will do exactly as you have suggested. Slowly, step-by-step. I am just puzzled about the vacuum readings .
Len, I'd reckon that Haynes manual states GL1000(?) carburetors' idle speed synchronization vacuum target will be 21
cm/hg ( centimeters of mercury ) Why, Cliff? 🤔 How do you reckon that has any relevance to Dan Filipi's GL1100 video?

answer...That's an example of yet Another probable mis-print, Haynes manual typographical error, Len.

A comparitive units of measure conversion equation results show that 21cm/hg = 8.27 in/hg . You will discover "mercury sticks" , see: viewtopic.php?t=18015&hilit=Vacuum&start=15 and the Carbtune Pro carburetor synchronizer tools both utilize the cm/hg unit of vacuum measure on their respective vertical column displays.

That blue painted 4 vacuum gauges panel that Dan utilizes in his video, is the same go-to diagnostic tool that I own and many hundreds ( thousands ) of motorcycle owners utilize, too, is sourced from Amazon, ebay, etc., for a reasonable price.

ALSO! Completely Disregard anybodys' advisement that the #3 carburetor is a 'reference' carburetor. no...it's...not

Done tumb2
Last edited by gltriker on Wed Feb 14, 2024 2:26 am, edited 11 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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dontwantapickle
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Re: synchronizing gl1000 carbs

#9

Post by dontwantapickle »

I use the regular blue painted set of gauges that everyone has and honestly, I don't care what the numbers are,
just that all 4 end up the same.

fwiw:
tuned engines are usually in the 8-10 range on my gauges.
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Re: synchronizing gl1000 carbs

#10

Post by Rat »

dontwantapickle wrote: Mon Feb 12, 2024 8:50 pm I use the regular blue painted set of gauges that everyone has and honestly, I don't care what the numbers are,
just that all 4 end up the same.

fwiw:
tuned engines are usually in the 8-10 range on my gauges.
Yep …

Gord
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Re: synchronizing gl1000 carbs

#11

Post by CYBORG »

I agree
1978 custom GL1000
1977 custom with 1200 engine
1985 gl1200
leonardhcross
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Re: synchronizing gl1000 carbs

#12

Post by leonardhcross »

Thankyou NGW friends for your insights. Many of us seem to have the same balancing rack. It sure helps those of us with limited experience to know that the guage needle pointing to "8" in the red, "manifold leak" zone is an acceptable reading for our bikes. Apparently, what matters is adjusting all carbs to the same reading. I'm not sure that I can bring myself to burn my Haynes manual. Here is a picture. I think it is as old as the bike and I'm kind of attached to it. I will just set it on the shelf.
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Re: synchronizing gl1000 carbs

#13

Post by pidjones »

There is a pdf of the Honda factory service manual here: https://goldwingdocs.com/Docs/Honda%20G ... -DDF6B.pdf
"Love 'em all.... let God sort 'em out!"
Ex 2006 GL1800 - the Black Pearl SOLD! to make room for:
2021 Can-Am Spyder RT Limited Dark Chalk Metallic
1975 Red GL1000 project - ex Pistol Pete project
1972 Triumph T150V Trident rescue - finished and FOR SALE!
1976 Yamaha RD400c
1978 GL1000 with '75 engine - the Hunley
Ex 1978 GL1000
Ex 1979 GL1000
Ex '79 CB750F rat bike
Ex '86 SEi
Ex '77 GL1000
Ex '76 RD400
Ex '72 Penton 125 set up for flat track
Ex '73 RD250
Ex '68 TR6C - chopped
leonardhcross
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Re: synchronizing gl1000 carbs

#14

Post by leonardhcross »

pidjones wrote: Tue Feb 13, 2024 7:49 pm There is a pdf of the Honda factory service manual here: https://goldwingdocs.com/Docs/Honda%20G ... -DDF6B.pdf
Thanks pidjones. Got it.
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