single carb conversion


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ken52
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Joined: Wed Feb 21, 2018 9:25 pm
Location: Coos Bay Oregon
Motorcycle: 1982 Goldwing GL

single carb conversion

Post by ken52 » Wed Feb 21, 2018 9:36 pm



I have a 1982 wing with a single carb conversion that was running fine
Now I can get it to idle while parked but everytime I take it for a ride at the first stop sign when I roll off the throttle it will die.
It has done this constantly for months ,is ther something I am missing? thanks for the help..ken



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RBGERSON
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had every year from 75 to 83

Re: single carb conversion

Post by RBGERSON » Thu Feb 22, 2018 8:04 am

Dirty carb first guess....but what carb are you running..choke issue? once warm it doesn't die?, you said first stop..so later it's OK??
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB

ken52
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Re: single carb conversion

Post by ken52 » Thu Feb 22, 2018 9:35 am

its running a solex 34 vw carb,had a new carb before same issue. changed all the jets and still the same problem.I am at a loss when we first did conversion it worke fne for about 1500 miles. so we switched to this carb it was operating fine when pulled from a stock voks wagon. the chokes electric. just cant seem to adjust where it stays running. thanks for the reply.
if you know someone who did the conversion and it works put me in contact.thanks

DaveO430
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Re: single carb conversion

Post by DaveO430 » Thu Feb 22, 2018 10:23 am

Those solex carbs didn't even work good on a VW. Do you have any sort of manifold heater on it?

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brianinpa
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1987 GL1200 Interstate

Re: single carb conversion

Post by brianinpa » Thu Feb 22, 2018 12:21 pm

Any chance there is a vacuum leak and what size jets are you using? I'm running that carb on my 1200, but there are some specific differences with that set-up... specifically, I do not have any vacuum connections. There are a few people that have had success with that carb on an 1100.
Brian

If you aren't having fun doing it, find something else to do.

ken52
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Re: single carb conversion

Post by ken52 » Thu Feb 22, 2018 2:13 pm

Its a standard 34t volks wagon carb,I don't know the size of the jets as this is the second carb we have.
no vacuum connections as ther're all capped off. any sugestions would be appreciated. thanks

ken52
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Re: single carb conversion

Post by ken52 » Thu Feb 22, 2018 2:16 pm

DaveO430 wrote:
Thu Feb 22, 2018 10:23 am
Those solex carbs didn't even work good on a VW. Do you have any sort of manifold heater on it?
thers no manifold heater on this setup,I live on the coast very temparate. thanks

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brianinpa
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1987 GL1200 Interstate

Re: single carb conversion

Post by brianinpa » Thu Feb 22, 2018 4:14 pm

Since it was running and has now started to stumble, as RBGERSON mentioned... dirt in the carb or one of the air bypass adjustments has vibrated enough to effect your idle.
Brian

If you aren't having fun doing it, find something else to do.

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DenverWinger
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Re: single carb conversion

Post by DenverWinger » Fri Feb 23, 2018 7:45 am

I've heard of people getting inventive with the coolant tubes, rerouting the coolant from the heads thru copper tubing soldered or otherwise attached to the manifold to warm up the manifold and carb....
♫ 99 Little Bugs in the Code, ♪
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WingAdmin
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Re: single carb conversion

Post by WingAdmin » Fri Feb 23, 2018 9:43 am

DenverWinger wrote:
Fri Feb 23, 2018 7:45 am
I've heard of people getting inventive with the coolant tubes, rerouting the coolant from the heads thru copper tubing soldered or otherwise attached to the manifold to warm up the manifold and carb....
Which is precisely what the Honda did with the GL1500.

If you open the throttle slowly does it stumble? Or does it only happen if you open it rapidly from idle?

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brianinpa
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Re: single carb conversion

Post by brianinpa » Fri Feb 23, 2018 9:45 am

Heating the manifold is not necessary. Some people think it is the ONLY way to run a single carb and that you will not get it to run right without the manifold being heated... I don't have any manifold heat and I have ridden in temperatures far below freezing to extreme summer heat and I never had a problem.
Brian

If you aren't having fun doing it, find something else to do.

ken52
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Re: single carb conversion

Post by ken52 » Fri Feb 23, 2018 10:12 am

yes it does stumble and lose power on take off,just as you roll it on.
same problem with new carb and used carb.

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brianinpa
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Re: single carb conversion

Post by brianinpa » Fri Feb 23, 2018 2:41 pm

When you look down the throat of the carb, you should see the brass tube that shoots raw fuel into the throat whenever the acceleration pump is activated. Where is it pointing? Straight down the middle? If so, bend it (it will actually rotate in it's mounting hole) so that fuel sort of bounces off of the side of the carb wall.

If you do not know where the carb is jetted, you may need to find out and start to make minor adjustments to the jets. The crossover from the idle jet to the main jet is small on these carbs, but once you have it set correctly, there should be no stumble. My idle jet started at 55 and the main was 127. I am now at 30 on the idle and 135 on the main and have no stumble.
Brian

If you aren't having fun doing it, find something else to do.

ken52
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Re: single carb conversion

Post by ken52 » Sun Feb 25, 2018 9:52 am

brianinpa wrote:
Fri Feb 23, 2018 2:41 pm
When you look down the throat of the carb, you should see the brass tube that shoots raw fuel into the throat whenever the acceleration pump is activated. Where is it pointing? Straight down the middle? If so, bend it (it will actually rotate in it's mounting hole) so that fuel sort of bounces off of the side of the carb wall.

If you do not know where the carb is jetted, you may need to find out and start to make minor adjustments to the jets. The crossover from the idle jet to the main jet is small on these carbs, but once you have it set correctly, there should be no stumble. My idle jet started at 55 and the main was 127. I am now at 30 on the idle and 135 on the main and have no stumble.
will try some sugestions soon as I can. thankyou.

ken52
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Re: single carb conversion

Post by ken52 » Sat Mar 10, 2018 2:03 pm

haven't been able to reset that part yet working on other bikes too. talked to a fellow the other night said the vacumm was to low.
how would someone add more vacumm to the carberation to maintain flow off fuel?. any helps always appreciated.

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Stew
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Re: single carb conversion

Post by Stew » Sat Mar 10, 2018 2:40 pm

Vacuum is mostly a function of how well the pistons create suction on their downward stroke against a closed throttle plate. Other things can affect it some, such as cam profiles but if low vacuum is the issue you may have mechanical problems like worn rings or poorly sealing valves. A compression test might shed some light.

Edit to add: Check other things too, like vacuum lines that are leaking or possibly have come off, or anything else leaking in the intake tract downstream of the carb.
Winging it every chance I get 8-)

19,119 miles when I got it from dad Oct 15, 2017 --- 24,532 miles and counting as of Oct 17, 2018!

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ekvh
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Re: single carb conversion

Post by ekvh » Sat Mar 10, 2018 9:35 pm

The other way to enhance what vacuum you have is smaller runners, or a smaller Venturi if it is replaceable. It speeds up the charge allowing faster filling. Assuming you have no vacuum leaks and jetting is close, that’s what I would try next. Some pretty knowledgeable builders feel the early 1000/1100 heads had intake paths (runners and heads) that were too large. Some of the successes I’ve read about used smaller tubing for the single carb, one was as small as 1-1/16” as I recall. Not sure of what your intake setup is. Most are close to the same as the runner size.

I had a set of V65 Magna carbs on a hybrid 1200 and it ran pretty nice with gl1200 runners on it. They are considerably smaller than 1000 or 1100 elbows, but seemed to breathe better even with the larger V65 carbs.

My next project will use smaller tubes. 1200’s were nearly 1-1/4” ID.



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