Single Carb cleaning

tallman21 · Post by **tallman21** » Mon Apr 04, 2011 11:30 am

Ok guys, Heres a good one.

I took the single carb (someone put a single carb kit on it) off my 80 gl1100. 1st. I know its a Holley Carb but i cant seem to find the model anywhere. It has 80589 and 1421 Stamped on the sided but whenever i search those nothing pops up.

Also as soon as i Opened it up these 2 parts fell out. No idea where they go.

Thats about it. Here are a few more pictures

tallman21 · Post by **tallman21** » Tue Apr 05, 2011 10:17 pm

Guess im just SOL

YouTube · Post by **WingAdmin** » Wed Apr 06, 2011 9:30 pm

It's not a carb I've ever seen before.

tallman21 · Post by **tallman21** » Thu Apr 07, 2011 4:35 pm

i got it back together after cleaning it an it is still having the same problem. The bike idles really well but when you crack the throttle at all it bogs down and just down. Any idea whats going on?

littlebeaver · Post by **littlebeaver** » Thu Apr 07, 2011 5:20 pm

That looks like a allen bit, laying there...it could have fallen in there somehow..That might be a BD-240 eng. for an International Harvester carb..I think ha ha..

Check it out and see if I'm right..Here check this out..http://www.carbkitsource.com/carbs/cata ... index.html I went to the holly site to find the information..Isn't it 1A or 2A, or 3A

thrasherg · Post by **thrasherg** » Thu Apr 07, 2011 8:38 pm

If it bogs down when you open the throttle then it is too rich. Can you try disconnecting the accelerator pump and see if that improves things? How does the ignition advance work on your bike? Is it vaccuum operated (Diaphram) and if so how is it connected up?

Gary

littlebeaver · Post by **littlebeaver** » Thu Apr 07, 2011 8:45 pm

I'm willing to bet he doesn't have the vacuum advance hooked up at all on it..I bet there's a way though..Thrasherg, that's a really good question makes me wonder if any of the other guys that have converted to single carbs have installed a pipe and hose to the vacuum advance or is it possible.. Tallman21 does your vacuum advance canister still have a hose hooked up to it..?? where does it go?

tallman21 · Post by **tallman21** » Thu Apr 07, 2011 9:29 pm

hmmm ok first where is the vacuum advance? all of the hook ups on the carb are being utilized. Also i figure out what it is. It is a Holley carb model 1940 that was made for a company called Daytona. Also im not sure how the ignition sequence works on it. Just dont know enough about bikes i guess. Ill take some pics tomorrow for you guys and post them on here

littlebeaver · Post by **littlebeaver** » Thu Apr 07, 2011 9:37 pm

On the right side of the bike just behind the engine look for a canister that has a hose fitting on it, that's your vacuum advance canister, is there a hose on it or did they block it off at the hose fitting ?..Might use a flashlight to see it..

littlebeaver · Post by **littlebeaver** » Thu Apr 07, 2011 9:42 pm

Here's a kit for your carb..1940http://scoutparts.com/products/?view=product&product_id=14519 there's a kit on the site above too...I thought you said it was 1421..Where did 1940 come from is it stamped on the side..Are you certain it's not 1904, because that fits the other number above..

tallman21 · Post by **tallman21** » Thu Apr 07, 2011 10:36 pm

yea its definitely a 1940. Its on another small stamp on the other side of the carb. I had the company send me the schematics on it and it matches this one.
http://www.google.com/url?sa=t&source=w ... YA&cad=rja

it doesnt look anything like the 1904 version

tallman21 · Post by **tallman21** » Thu Apr 07, 2011 10:37 pm

littlebeaver wrote:On the right side of the bike just behind the engine look for a canister that has a hose fitting on it, that's your vacuum advance canister, is there a hose on it or did they block it off at the hose fitting ?..Might use a flashlight to see it..

I will have to look in the morning. stay posted

littlebeaver · Post by **littlebeaver** » Thu Apr 07, 2011 11:07 pm

Good job finding which carb it was..Now you can buy a manual for it maybe and find where those parts go..I sure don't know...that sucker is old..

tallman21 · Post by **tallman21** » Fri Apr 08, 2011 1:04 pm

So i foind the canister and the hose is all frayed. Pic coming soon

thrasherg · Post by **thrasherg** » Fri Apr 08, 2011 1:21 pm

Is it connected to the carb? If it isn't connected or is leaking it will also cause bogging when you accelerate..

Gary

tallman21 · Post by **tallman21** » Fri Apr 08, 2011 1:41 pm

Lioks like it was leaking prett bad cause it was attached. I cut the hose and reattached it see if yhat works. How long does it take the carb to de pressurize?

tallman21 · Post by **tallman21** » Fri Apr 08, 2011 2:08 pm

Ok so i found that port u were talking about

It does connect to the carb but there is a junction halfway through the hose that was frayed so i cut it back and reconnected it.

The bike still idles really well. When i disconnect that hose it idles worse. Still, whenever i crack the throttle it bogs down and shuts right off. If i gradually give it gas then the rps will increase and it wont bog out and shut off. but anytime i crack it, it cuts out. this is starting to get frustrating.

littlebeaver · Post by **littlebeaver** » Fri Apr 08, 2011 3:02 pm

Try this, start the bike, let it idle, pull off the hose at the front at the carb and put your mouth to the hose and suck on it and the engine rpm's should raise , if it doesn't your vacuum advance is locked up.. You see the suction from the carb moves the pick up coils that is operated by suction thru the canister, there's a arm that pulls into the canister and moves it, what happens is, rust starts in there and things freeze up or the diaphragm in there gets worn and holes follow..I think you have a carb issue..Maybe you have a clogg somewhere in the carb..I don't know..As much as I hate to say it but your mechanical advance probably needs cleaning, that's under where the canister lives..It's a job to get to it but not too bad once you have done it,, Remove the swingarm..ect. I would remove the carb and check your passages with a fishing line or wire or something..Is it all sealed well at the intakes..Good o-rings? No air leaks.?

tallman21 · Post by **tallman21** » Fri Apr 08, 2011 3:30 pm

Now that i think of it one of the rings was torn. Would this have a big impact on how tge carb us running??

littlebeaver · Post by **littlebeaver** » Fri Apr 08, 2011 3:35 pm

It's sucking air then big time, I would get a replacement for all of them..

tallman21 · Post by **tallman21** » Fri Apr 08, 2011 4:10 pm

Time to buy a rebuild kittt

tallman21 · Post by **tallman21** » Mon Apr 11, 2011 8:19 pm

Update for you guys, Rebuild kit is on its way. Hopefully here on wed. Also i got a hold of the manufacturers and they are sending me that little ball bearing that I lost and tried to replace, Also fixed the vacuum hose. soooo hopefully by the end of the week the bike will be working

littlebeaver · Post by **littlebeaver** » Mon Apr 11, 2011 10:04 pm

I would love to see photo's of the re-build kit or just what you get in a kit like that..Thanks tallman..I take it you got that oil filter bolt replaced..

tallman21 · Post by **tallman21** » Mon Apr 11, 2011 10:38 pm

Hey yea i will. Im actually making a video of it and putting it on youtube. And no sadly i havnt gotten it off yet.

littlebeaver · Post by **littlebeaver** » Tue Apr 12, 2011 12:34 am

I suppose you could grind off the bad bolt head flush, drill a hole in the center where it was and use left handed taps and left handed bolts to get it out..Most gm engines have left handed bolts on there tensioners.. just a thought...I know you probably don't have left handed bolts or taps..Maybe a friend does..

Single Carb cleaning

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