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Carb guru's: Help on '86 Honda A/F mix problem
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Question Carb guru's: Help on '86 Honda A/F mix problem - August 4, 2009, 07:14 PM

Any carburetor jedi's out there? I have a '86 Honda VT1100 that has been sitting for 9 years. Fuel has been drained, carbs removed and thoroughly cleaned, new plugs, coils test out with strong spark and I've checked compression, as well as set the A/F screws per the service manual.
Here's the deal: she'll start and run but only on 1 cylinder. Unless I have it choked off more than what the choke will do. In other words, if I fold up a rag and hold it over the front cylinder carb (covering 75% of the hole), the thing takes off. Remove the rag to let it breathe and we're back to 1 cylinder.
What this says to me is one of two things: Either I'm not getting enough fuel normally (and by blocking air off, I am changing the A/F ratio), or by blocking off the air, there is an increased suction and more fuel flows out of the carb.
I have checked all the little orifices in the carbs, played with the A/F screw, soaked it in cleaner, and cursed at it. No change in results . Anyone have any experience with this sort of thing?


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August 4, 2009, 07:21 PM

Pull them off and have the carb jets and bodies soaked. Then synk them and perform an idle drop. If everything else is in good working order it will purr like a kitten.
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August 4, 2009, 07:28 PM

My guess is that by blocking the carbs you're creating enough vaccum to suck fuel past the needle or main jet. I'd bet your pilot on the other cylinder is plugged.

Get yourself a wire bristle brush. snip off 1 wire, and clean that pilot jet.


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August 4, 2009, 07:36 PM

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Pull them off and have the carb jets and bodies soaked. Then synk them and perform an idle drop. If everything else is in good working order it will purr like a kitten.
They have been completely disassembled and soaked in Varsol for 24 hours, then wiped off and blown dry with electric contact cleaner. Performing idle drop causes no change on that cylinder. I will admit, I don't have a manometer to sync the carbs. However, slowly adjusting that screw 3 turns in either direction produces no results either. BAAAAAAHHHHHH!
Sorry. 'lil frustrated. Know where I can borrow a sync tool? I may just as well do it right


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August 4, 2009, 07:39 PM

Have you tried briefly giving the other cylinder a squirt of starting fluid/brake cleaner/gum cutter/flammable whatever while it's thumping on the 1?

That would pretty easily confirm it's lack of fuel to that cylinder.


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August 4, 2009, 07:45 PM

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They have been completely disassembled and soaked in Varsol for 24 hours, then wiped off and blown dry with electric contact cleaner. Performing idle drop causes no change on that cylinder. I will admit, I don't have a manometer to sync the carbs. However, slowly adjusting that screw 3 turns in either direction produces no results either. BAAAAAAHHHHHH!
Sorry. 'lil frustrated. Know where I can borrow a sync tool? I may just as well do it right
Did you take the carbs off the bank? If so then synking them might help but I still think something in the slow speed circuit is clogged.
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August 4, 2009, 08:02 PM

Are the slides of both carbs operating freely? When you removed the diaphrams, did you notice any tears? Are the springs that hold the slides closed at idle the same?


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August 4, 2009, 08:04 PM

Have you tried switching the jets and diaphrams with eachother to see if the problem moves to the other cylinder?


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August 4, 2009, 08:35 PM

Check the float level setting. Float level seldom goes out of adjustment, but rough handling during disassembly can do it.

Even a small leak in the diaphram will screw up the A/F mix, but the slide rests in the idle position so the cylinder should idle if that was the problem. Swap parts between cylinders and see which part the problem follows.
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August 4, 2009, 10:45 PM

I've got a better soak than Varsol. Can you bring them to Rockville?


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August 4, 2009, 11:56 PM

edit disclaimer: I'm no guru but I know a few

When you say
Here's the deal: she'll start and run but only on 1 cylinder.
Is that idle, mid, or full throttle?

I like the switching parts idea.

If it's a pilot, I'd cut a strand of copper wire and ream it. Tap the wire end to flatten it slightly oversize. Soft copper wont hurt the part. Sometimes chemicals and air just don't get it done.

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August 5, 2009, 12:39 PM

Thanks for all the help!
Seijirou, yup I manually squirted fuel into it and it would pick up. so, that's why I am leaning to fuel delivery.
I think Redlevel is onto it with the slow speed circuit. Everything moves freely and the diaphrams are good.
It always runs on the one cylinder as high as I can rev it (3k) and then it bogs down, but sometimes the other cyl. will hit.
Geezer and WKDBLD, I am going to start the parts spapping tonight or tomorrow. I did take a strand of copper wire and ream the pilots in the one. Floats are spot on.
Again, thanks to all of you. I'll post back up and let ya'll know what evolves, or if I blow myself up squirting ether into a running engine.


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March 13, 2011, 04:10 PM

Bringing back a dead post.....

OP - any luck with this? I think I have a similar problem. I can crank the bike and within a couple seconds fuel will start to pour out of the overflow hose from carbs 1 and 2.

When I pull the airbox and check the fuel lines all looks good, I can see that in carb 1 it is full of fuel, 2,3,4 are empty/dry.

My next step is to pull the carbs and clean/inspect each one. Soak overnight in carb cleaner and use a copper wire to run through the openings.

Any other thoughts?

Thanks.


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Quote:
Originally Posted by Kayaus View Post
Bringing back a dead post.....

OP - any luck with this? I think I have a similar problem. I can crank the bike and within a couple seconds fuel will start to pour out of the overflow hose from carbs 1 and 2.

When I pull the airbox and check the fuel lines all looks good, I can see that in carb 1 it is full of fuel, 2,3,4 are empty/dry.

My next step is to pull the carbs and clean/inspect each one. Soak overnight in carb cleaner and use a copper wire to run through the openings.

Any other thoughts?

Thanks.
Float needles stuck open. Carb rebuild in your future. When rebuilding take all jets and mixture screws out and clean and soak.


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