1984 after carbsync new issue arises. Help.


Information and questions on GL1200 Goldwings (1984-1987)
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zamboni920
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1984 after carbsync new issue arises. Help.

Postby zamboni920 » Wed Jul 11, 2012 8:30 pm



Did a long needed carb sync. Used Wingadmin's write-up, and synced with one single vacuum gauge......: read number 4 carb (app 20 in) .....matched number 2 to number 4. Number 1 got matched to 2 and 4 . Number 3 matched to all previous, wich should even left and right side out. Ran like poo :( . Back to number 4 (figured I'd double check everything) . Now number 4 is down to app 7 in vacuum :?: . Did it all over again....all carbs read all over the place. Went around and around about six times. Now all carbs read app even at 8 in vacuum. Runs decent, but not good. Main issue after all this is a "puffing" or dull backfire through airbox, under load only. Is it time for carb clean? Or could there be other issues? I also checked all Idle micture screws ( caps were already gone), they all threaded about 3 - 3 1/2 in until lightly seated (initial setting according to book) , except one wich threaded only 2 turns in. I removed them, replaced the flattened O-rings with new ones , and reset all screws to 3 1/2 out. I tried to tune them per book, but can not get any RPM change turning in nor out, unless at the very last turn in. These two issues may be unrelated, but I am tempted to remove carbs and clean/polish as needed.
Virgil did some mods on his, but not sure if I want to follow suit. Not sure exactly what it would do, for better or for worse.
Any advice, thoughts?



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virgilmobile
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Re: 1984 after carbsync new issue arises. Help.

Postby virgilmobile » Wed Jul 11, 2012 10:16 pm

***********Absolutely do not follow suit.******
Yes I modded mine, but it was after I cleaned and polished the whole thing up and replaced all the rubber and after I finished the sync then test ran it and after I was absolutely sure my problem was not related to defective carbs,spark,compression or timing and everything else was eliminated.

I would never suggest that your bike is exactly like mine and what I did would absolutely fix yours right up no questions asked.
This is what I did when all else failed to fix my problem.

It just had a flat spot.I noticed it at 2000 rpm...That's when I added a little choke and found just a bit would clear it up.That's when I determined I needed more fuel in that range and it would be related to the main jet.
****I did the mod to fix a lean mixture in the 1500-2500 rpm range.****
It is a common problem on a few 1200's....It idled fine and would rev past 3500 rpm before and after the changes.

The 1200 problem is just opposite of my 1500...It would load up a bit in the same rpm range.I cut off the fuel and in just a minute it would clear right up.I ended up lowering the fuel level on that one to lean it out a bit.

What I suggest is one quick test.
Get the bike to the point where it will fart at you...add a little "choke"/fuel enrich.as you move the lever,if it magically clears up,the carbs are a bit lean on the main jet.If it just loads up more then it's running rich.
From that you can determine what to do.
This is assuming the engine idles smooth,no rattling and pulls OK from 900-to the 2000 rpm range..

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zamboni920
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Re: 1984 after carbsync new issue arises. Help.

Postby zamboni920 » Wed Jul 11, 2012 10:54 pm

Sometimes I forget that the 1200 has the same choke system as the 1500.....add fuel rather than choke the air. It is, as you suggest, an easy way to check for a lean condition.

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Re: 1984 after carbsync new issue arises. Help.

Postby Ghostrider52005 » Thu Jul 12, 2012 12:09 am

The puff could be weak spark, dirty carbs or about a dozen other things. Check your plugs and read them. They should be a tan color not white and not black and sooty. Or wet.
Check the fire on your plugs to see if you have a good blue spark or a weak yellow spark. Or firing off and on.
You could very well have stuck slider or plugged jets etc.
I use a carbtune hooked to all four cylinders at once syncing first the left side then the right side and finishing up by syncing right to left. Never had a problem doing it this way. All your doing is making sure the butterfly valves are opening and closing together when you sync so that all cylinders are pulling equally.

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virgilmobile
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Re: 1984 after carbsync new issue arises. Help.

Postby virgilmobile » Thu Jul 12, 2012 10:51 am

zamboni920 wrote:Sometimes I forget that the 1200 has the same choke system as the 1500.....add fuel rather than choke the air. It is, as you suggest, an easy way to check for a lean condition.


Yup,and the reverse is true.If adding the "choke" makes it worse(as it did on my 1500 in the 12-1800 rpm range)..that indicates it's getting more fuel than it can burn.

Now weather or not it's related to the carbs or a porting/vacuum problem must be eliminated first before any mods are done.
My 88 carbs have been off 4 times in as many months for minor tweaking.
It seemed as I cured one problem,I created another.I chased this thing around for 6 months before I got it the way I expected it to run.

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zamboni920
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Re: 1984 after carbsync new issue arises. Help.

Postby zamboni920 » Thu Jul 12, 2012 7:51 pm

Tried the choke thing.....not while riding, but on centerstand.....the "puffing" did not appear until choke was applied. Sounds like a rich condition!?
Plugs was close to good. Not perfect, a little on the dark side. Plug for number 1 was black though. Also rich condition!?
Carbs out....not disassembled yet. Air intake side of number 4 is shown in picture. The others had soot traces but not nearly as bad as this. Rich condition again!?
Removed fuel bowl on number 2 and 4 . Very clean inside bowl....float / needle not sticking. Low jets was quite dirty and close to beeing completely clogged.
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virgilmobile
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Re: 1984 after carbsync new issue arises. Help.

Postby virgilmobile » Thu Jul 12, 2012 8:43 pm

Yucky....Soak and polish the carbs up real good.Sync them.Use a shop vac on each one to test the slide action.
Your on the right track.I hope.

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virgilmobile
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Re: 1984 after carbsync new issue arises. Help.

Postby virgilmobile » Fri Jul 13, 2012 11:40 am

check this out.It's a good description of "how to"
www.ngwclub.com/forum/viewtopic.php?f=8&t=12168

Ghostrider52005
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Re: 1984 after carbsync new issue arises. Help.

Postby Ghostrider52005 » Fri Jul 13, 2012 11:20 pm

If your low speed jets are clogged the bike is going to run lean on those cylinders. puffing can either be to rich to lean or just sucking air someplace its not supposed too. Or weak plugs or coils.
From the looks of the pics and what you say Id clean the jets and carbs, check the sliders to see they operate freely, and resync. If its still not right then either 1 your main needle jet diaphrams have a hole in one or more of em. 2 Your sucking air someplace. Squirt some starting fluid in little bursts around the air box base intake boots etc. If the engine speeds up it picked up the fluid thru a air leak. Or 3 Your fire is weak either plugs plug wires, caps, or coils. Im betting that cleaning the clogged jets and sliders takes care of the problem. :)

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zamboni920
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Re: 1984 after carbsync new issue arises. Help.

Postby zamboni920 » Sat Jul 14, 2012 8:45 am

Virgil.....thanks for that link. Although for GL1100, it has some great pointers and tricks.
Ghostrider.....Have checked all around carbs for any intake and/or vacuum leaks recently....nothing pointing towards any leak. Have not checked sparks yet, but will replace plugs, and check sparks when this thing goes back together. Also compression check at that time, will be done.
Right now, in process of cleaning.
See pics below for my "parts cleaner" :lol: .
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Waterpic parts cleaner...if my dentist ever knew.....
Waterpic parts cleaner...if my dentist ever knew.....
"parts cleaner" in action
"parts cleaner" in action

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zamboni920
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Re: 1984 after carbsync new issue arises. Help.

Postby zamboni920 » Sat Jul 14, 2012 8:47 am

Virgil.....2000 grit paper for polishing? I recall you used that when polishing yours. The guy in your link uses aluminum foil.....never tried this, not sure how effective. Anyone tried aluminum foil for polishing?

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WingAdmin
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Re: 1984 after carbsync new issue arises. Help.

Postby WingAdmin » Mon Jul 16, 2012 12:03 am

zamboni920 wrote:Virgil.....2000 grit paper for polishing? I recall you used that when polishing yours. The guy in your link uses aluminum foil.....never tried this, not sure how effective. Anyone tried aluminum foil for polishing?


I've used it for polishing chrome, it does a very good job. Haven't heard of using it for that application before.

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zamboni920
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Re: 1984 after carbsync new issue arises. Help.

Postby zamboni920 » Wed Jul 18, 2012 6:25 pm

Carbs all clean and shiny :D . Decided, while I am dug this deep, to rejet one size up. Originals are #35 slow jet and # 108 main jet. Ordered OEM jets , #38 and #110 respectively, from Jetsrus. Came in today, but it is raining cats and dogs, lightning, thunder.....thinking in a day or two :D .

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virgilmobile
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83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: 1984 after carbsync new issue arises. Help.

Postby virgilmobile » Wed Jul 18, 2012 7:21 pm

2000 grit paper is just a bit more abrasive than polishing compound.I'm getting ate up by oxidizing aluminum and rubbing aluminum foil just dosen't clear it.it is a quick method to smooth out the ridges,just don't rub your fingers raw.




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