This is where discussions of EFI systems, Dual Carbs, Single Carb mods and plans can be discussed and shared.
If you are working on or have a problem with stock carbs then your questions do not belong here, please post them in the Goldwing Tech Discussions Forum.
gregforesi wrote:
Remember that you are replacing (4) 33mm carbs with a single 25.5mm carb. The stock carbs provide a total of 3422sq-mm of carb throat area and the Brosol is about 510sq-mm. You're about 15% of the stock carb throat area.
.
I want to point out all of this is only at WOT
I assume if the stock carbs were at very small openings and
the Brosol was @ WOT the difference would be less.
Timothy Mark Fisher
Catalina Arizona
"ride it.. don't be one of those guys who will fix it 'til it's broken" (JDVorchek)
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Just $.03 more ,....... now that we have established your wish of "Single Carb Conversion", do some more research on the manifold you wish to design. I'm runing an Ole CI Conversion, so mine was an after-market at the time. I never had the opprotunity to know what/how the Oems performed. But I was at least lucky to have a reliable running bike. I wish I could build one but when I went from a 1-barrel to a 2-barrel, I was told to make sure it was installed in the middle perfectly. That's all I can contribute for now. I would really look for a better design though! Keep us informed and enjoy the adventure!!! There's also a section over on Steve Saunders site that talks about Carb Conversions that will give you some Ideas too!! Later, Bob
In many of the single carb conversions, the long intake runners required some heat to keep the fuel from puddling.
This EMPI part (01-00-3241-0) has been the heart of a few of the good single carb designs.
empi 3241.jpg
This was my attempt at a dual sidedraft weber conversion manifold. Once again, I designed an optical illusion. The illusion was that it could be built cheaply.
Right side DCOE.jpg
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2006 GL1800 (Brutus Maximus)
1978 GL1000 (White Trash - 2012 BOTY
(If you want to discuss the Trashmobile, Webers, Rearsets, Clubmans, or other stuff then send me a PM.) "Getting old ain't for sissies" - Phyllis Diller "So how much you gonna spend to win that $5 trophy?" - Cyborg
It all starts to make rebuilding 4 stock carbs very easy. And remember if you ride the bike, the 4 stock carbs will hold the rebuild for many, many years. These carbs only seem to need a rebuild after mega miles or sitting for 6 months without a proper storage process.
Proud member of the NGW Cartel (Rochester MI)
1977 GL1000 BADDOG (April 2012 BOTM)
1976 LTD - '993 LTD...and so it begins'
You should remember that it's peace of mind you're after and not just fixing the machine. R.Pirsig
Fred Camper wrote:It all starts to make rebuilding 4 stock carbs very easy. And remember if you ride the bike, the 4 stock carbs will hold the rebuild for many, many years. These carbs only seem to need a rebuild after mega miles or sitting for 6 months without a proper storage process.
That's for sure! (Even though I run a Carb conversion!!!) I've always said if you can rebuild the OEMs, then by all means I encourage you too. But some will just want to do the conversion (out of ther own chioce) instead of tinkering with the ole carbs. So I encourage / support them to study both routes and then deciede. And it's always fun to see the outcome. Oh just my 2cents, I never have known what the Oems are like but since running a single carb conversion for about 14yr.s, there have been No problems I couldn't handle and love the adventure. Later Bob
Just recall that this is a hobby, and nothing wrong with modifying as we all please and no reason to copy what has already been done. So I see both sides here.
Proud member of the NGW Cartel (Rochester MI)
1977 GL1000 BADDOG (April 2012 BOTM)
1976 LTD - '993 LTD...and so it begins'
You should remember that it's peace of mind you're after and not just fixing the machine. R.Pirsig
Fred Camper wrote:Just recall that this is a hobby, and nothing wrong with modifying as we all please and no reason to copy what has already been done. So I see both sides here.
I agree with ya there Fred dancer/ I keep telling my wife, my bike is my therapist to me!! I can talk to it any way I please and still have fun doing so !!! It is nice to use other people's ideas solveing a problem and even there Help! Later Bob
Well, I have got a bit of an update on my bike. I checked the engine timing and it was correct as I suspected and went on to valves. I guess the PO's idea of valve adjustment was to turn them all in till they were touching and then turn them out a turn or so. They were all far too tight. So I set them to .004 for intake and .005 for exhaust following the tutorial on this site and it did the trick. I took the bike around the block and my torque under load issues seemed to be gone. - Thanks Fish
So that issue being solved, I was off to the task of getting things tuned properly. I started with ignition timing as I have read these single carb conversions like an advanced spark. While tinkering I caused a backfire into the carb and after that it won't run at all. I hoped I fouled the plugs but a good cleaning didn't fix it.
Could a backfire like that damage the carb in some way?
This is about the point when I ran out of patience and time, so I packed it up.
It "should not" have hurt the carb. I would very carefully inspect the plenum of your manifold for cracks or busted welds as false air may be the culprit.
"Agreement is not a requirement for Respect" CDR Michael Smith USN (Ret) 2017
"The book is wrong, this whole Conclusion is Fallacious" River Tam
"Yea I do dance awkwardly, and I am having more fun than you" Taylor Swift
2008 GL1800 IIIA "TH3DOG"
1984 GL1200 Standard
1975/6/7/8/9 Arthur Fulmer Dressed Road bike
1975 Naked Noisy and Nasty in town bike
Psst. oh and by the way CHANGE YOUR BELTS!!!!
Hmm, Interesting. I will do that next time I make a trip home. I may put the stock carbs back on just to see if it will start and behave the way it did before. It's quite frustrating as I'm sure you understand. At least I did get one good trip around the block. lol
Sounds like a familiar story,. .. I have the CI manifold and put a Holly/Weber 32-36 on and mine back-fired. Next door neighbor came over and thought I was seating off dynomite !! Found out the acc. pump spring on the carb was side ways putting raw gas in the plenum and everytime I went to start,....... BOOOOM !! I ended up finding my cam belts wouldn't line up after that, so I either skipped a tooth or steretched the belt. I forgot to say I put the CI conversion back together and hoped it would run great like before BUT she wouldn't run well at all. I ended up putting on new T-belts, set the valves ( I took out the plugs and slowly turned the engine over watching the valves open & close, and making sure no hang ups occured as I turned the crank ) and with the CI conversion back on ( held my breath ), pressed the start button and she purred like a kitten. It took a year before I would attempt to put the Holly/Weber on, but she works great now:orange !! Sorry for the long story,... I'd make sure everything lines up well on the cam belts also. A little work to check them but a preventive move!! Ya might need New ones !! Good Luck Bob
adamhixon wrote:The Problem:
It has no torque under load at all and I still can't seem to be able to get it to idle smoothly under about 1.7k.
How are you adjusting for idle on that carburetor?
Edit: I've the exact tuning sequence for that carb on a GL1000 on another computer that I'll transfer to this one so I can post it up for you. Need a day or so to get it up...
,....... now that we have established your wish of "Single Carb Conversion", do some more research on the manifold you wish to design. I'm runing an Ole CI Conversion, so mine was an after-market at the time. I never had the opprotunity to know what/how the Oems performed. But I was at least lucky to have a reliable running bike. I wish I could build one but when I went from a 1-barrel to a 2-barrel, I was told to make sure it was installed in the middle perfectly. That's all I can contribute 
for now. I would really look for a better design though! Keep us informed and enjoy the adventure!!! There's also a section over on Steve Saunders site that talks about Carb Conversions that will give you some Ideas too!! Later, Bob 
!! Could you do one like on your bike but using a single barrel carb?? That would be neat to see!!! Later,. 
Bob
!!! It is nice to use other people's ideas solveing a problem and even there Help! Later 
Bob
!! Found out the acc. pump spring on the carb was side ways putting raw gas in the plenum and everytime I went to start,....... BOOOOM 
!! I ended up finding my cam belts wouldn't line up after that, so I either skipped a tooth or steretched the belt. I forgot to say I put the CI conversion back together and hoped it would run great like before BUT she wouldn't run well at all. I ended up putting on new T-belts, set the valves ( I took out the plugs and slowly turned the engine over watching the valves open & close, and making sure no hang ups occured as I turned the crank ) and with the CI conversion back on ( held my breath ), pressed the start button and she purred like a kitten. It took a year before I would attempt to put the Holly/Weber on, but she works great now:orange !! Sorry for the long story,... I'd make sure everything lines up well on the cam belts also. A little work to check them but a preventive move!! Ya might need New ones 
!! Good Luck 
