1100 Carbs - appears #1 and #4 not gettin gas

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Pony Ruiz
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1100 Carbs - appears #1 and #4 not gettin gas

#1

Post by Pony Ruiz »

I'm not a purist - I have 1100 carbs on a 1000. I had this setup on another 1000 (78) and they worked great.

I rebuilt these using Randakk's kit. I've done this more than once on 1100's and they have worked (eventually :) ). I have not run across this issue before.

#1 and #4 aren't firing. 2 and 3 getting hot. Runs great on 2 cylinders yeah! Points with Dyna coils and resistor.

What I have checked so far:
swapped plug wires
All spark plug wires getting spark.
Replaced spark plugs with new ones.
Intake valves opening and closing.
Compression 120 on all 4.
all 4 bowls have gas in them.

I've since take the carbs off. I did notice they weren't fastened as tight as I had thought at the runner but 2 and 3 worked.
I also noticed that 2 was missing the o-ring at the runner/head. But it was firing. I am assuming minor vacuum leaks don't cause a cylinder to not fire if its getting fuel - just that the motor is gonna run rough.

I now have the carbs off.
I've checked / re-cleaned (they were fine) :
idle jet
main jet
cv slides ok

At this point all I can think of doing is maybe taking #1 and #4 off and swapping out for a different #1 and 4 or different set (i have extras :) - the thought being there is something wrong with the carb body itself. I would like to find the problem though. All 4 carbs and parts were cleaned in an ultrasonic cleaner.



The only other thing I was thinkin of is maybe the fuel pump ain't doing its job, i.e. not pumping fast enough. Kinda ruled that out since there is gas in the bowls and 2 and 3 are firing.

Any ideas?
Thanks
1978GL1000 naked - kinda sadly gone. no bike at the moment.

"The greatest shortcoming of the human race is our inability to understand the exponential function." Albert A. Bartlett.
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flyin900
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Re: 1100 Carbs - appears #1 and #4 not gettin gas

#2

Post by flyin900 »

If they have the accelerator pump circuit and they should being 1100 carbs did you check that circuit when the carbs were off the bike and you did the cleaning? You should be getting a spray into the carb venturi throats from the brass nipple when rotating the bellcrank on the carb set. It takes a good number of cranks initially to prime the circuits.
Did you break down the carb bodies completely off the plenum and clean both the main fuel rail feeds and the accelerator pump circuit feeds? Did you also verify the brass nipples inside the venturi throats where the throttle plates are are clear and spraying gas as noted above when the bellcrank is turned?
Current Bikes:

1966 CL77 - Honda 305cc - Dual purpose - "Gentleman's Scrambler" was a period moniker.
1967 CL175K0 - Low production number with #802 engine serial- winter 2019/2020 full restoration.
1972 CB350F - Baby Four with low mileage - Cosmetic refresh to the next level 2021/2022.
1978 CB550K - Very original bike with only 7499 Km. from new - light cleanup and refresh done.
1983 CB1100F - Canadian model - DOHC Supersport in pristine low kilometre condition from new.
1984 GL1200 - Standard model in showroom condition - two owner bike from new.
1984 CX650E - Restored summer 2017 - a rare Eurosport model - excellent one owner bike.
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Pony Ruiz
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Re: 1100 Carbs - appears #1 and #4 not gettin gas

#3

Post by Pony Ruiz »

If they have the accelerator pump circuit and they should being 1100 carbs did you check that circuit when the carbs were off the bike and you did the cleaning? Nope.You should be getting a spray into the carb venturi throats from the brass nipple when rotating the bellcrank on the carb set. It takes a good number of cranks initially to prime the circuits. OK
Did you break down the carb bodies completely off the plenum and clean both the main fuel rail feeds and the accelerator pump circuit feeds? Yes Did you also verify the brass nipples inside the venturi throats where the throttle plates are are clear and spraying gas as noted above when the bellcrank is turned? I did not


I like your form of questioning....were/are you a Lawyer?
Reminds me of the Congresswoman asking our acting Att. General for yes or no answers. I don't think she got one yes or no but I digress. ah ha ha. I appreciate the response!!

I didn't check the circuits. I cleaned them in an ultrasonic cleaner so I just assumed they were ok.
So I'm guessing that means I have to hook up a little gravity feed container with some fuel in it and see what gives.
Correct?

THANKS!!
1978GL1000 naked - kinda sadly gone. no bike at the moment.

"The greatest shortcoming of the human race is our inability to understand the exponential function." Albert A. Bartlett.
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flyin900
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Re: 1100 Carbs - appears #1 and #4 not gettin gas

#4

Post by flyin900 »

You need the verify that those brass nipples are shooting a stream of gas once the accelerator pump circuit is fully primed. The nipple is back on the plenum side of the carb body, so it is almost impossible to see from the intake elbow side of the carbs that attaches to the head. If you remove the two intake elbows on the side that isn't running so the carbs are slightly tilted down. You will probably need to prop them up so there isn't a steep slope if the other sides elbows are still intact. This will avoid the float bowls possibly overflowing into the carb venturi on the suspect side.
So just a small tilt downward on the carb assembly and then pump the throttle quite a few times (8-10) times and if the accelerator pump circuit is working you will start to get a small trickle of gas running out the bottom of both of the outer carb bodies where the intake elbow attaches to the carbs.

If not then you will need to remove the carbs again and clean up those nipples on that side. It maybe worth checking both sides, so if the side that is running is good is spraying from the brass nipples and the other side isn't then you may have found the problem.

If not ..... that's all I got! Have to take the fifth on your other question....though I wasn't a lawyer. :-D
Current Bikes:

1966 CL77 - Honda 305cc - Dual purpose - "Gentleman's Scrambler" was a period moniker.
1967 CL175K0 - Low production number with #802 engine serial- winter 2019/2020 full restoration.
1972 CB350F - Baby Four with low mileage - Cosmetic refresh to the next level 2021/2022.
1978 CB550K - Very original bike with only 7499 Km. from new - light cleanup and refresh done.
1983 CB1100F - Canadian model - DOHC Supersport in pristine low kilometre condition from new.
1984 GL1200 - Standard model in showroom condition - two owner bike from new.
1984 CX650E - Restored summer 2017 - a rare Eurosport model - excellent one owner bike.
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gltriker
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Re: 1100 Carbs - appears #1 and #4 not gettin gas

#5

Post by gltriker »

It's not indicated if this issue is being experienced only at engine idle speed. If so, my first thought is the slow fuel jet is contaminated.
But, you spoke of cleaning the carburetors' passages. If all circuits are in fact clear ,that causes me to wonder if the affected carburetors pilot fuel circuit adjustment screw tip might be broken off and stuck in the carburetor body.
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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