Won't start!! - Page 2 - Honda Rebel Forum
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post #11 of 27 Old 08-03-2019, 09:06 PM Thread Starter
 
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Sorry called it the wrong term. I know what each does. The idle screw is where it used to be. I cannot turn it enough to make it idle, so that’s not the problem.
The air/fuel needle screw doesn’t seem do affect anything but I did leave it at the 2.75 turns out.
If I pull the carb back out, what should I be looking for then now knowing that it runs and sounds good with the throttle but immediately dies when let go?
Which passage/jet or thing should I be verifying?

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post #12 of 27 Old 08-03-2019, 10:53 PM
 
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idle passages at this point..
diagrams may help you understand how they are interconnected..
pilot and main air jets intakes are under vacuum piston diaphragm..

the emulsion tube attached to idle jet and emulsion tube aka "Needle jet holder" part #20 have very small holes in side which can be plugged and overlooked..

Enricher (choke) is also interconnected to idle air circuit but not shown...
It's air intake is in filter side air horn
Attached Images
File Type: jpg 20190214_203314aa.jpg (278.3 KB, 0 views)
File Type: jpg IdleCircuit.jpg (105.1 KB, 1 views)
File Type: jpg user4566_pic3215_1308555435.jpg (153.6 KB, 2 views)
File Type: jpg AirBleed.jpg (206.3 KB, 0 views)

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post #13 of 27 Old 08-03-2019, 11:40 PM
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To add to what SK said, the emulsion tube also has, for lack of a better term, a spiderweb like lattice at the bottom of the tube. Don't try running anything all the way through the tube or it may be damaged and ruined.

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post #14 of 27 Old 08-05-2019, 12:48 PM Thread Starter
 
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SK/Flitecontrol, thanks so much for you help on this.
I've been looking at the diagrams, and I've got the carb back out. I'm trying to make sense of it. I'm not sure about what Flitecontrol mentioned about not poking through in the emulsion tube, and where that is exactly. Is the emulsification passageway the Idle pathway? Is there something I can verify or confirm with the carb opened up on the table to make sure it's clear for the idle pathways?

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post #15 of 27 Old 08-05-2019, 01:11 PM
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Well we're guilty of using the wrong term too (according to Honda). We were referring to part number 36 in the diagram, the slow jet. The tubular part has a fairly large hole on top, several sets of smaller holes on the side, and the bottom has a fine lattice-like opening, all of which serve to break the stream of gasoline into fine droplets. The finer the droplets entering the combustion chamber, the more efficiently the gas will burn. Enlarging any of these holes will permanently damage the jet. The lattice opening in the bottom of the jet tube is so fine it is hard to see. Some folks think it is clogged and will run a metal object through it.

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post #16 of 27 Old 08-05-2019, 01:42 PM Thread Starter
 
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@flitecontrol - I'm getting somewhere now. Since I bought a rebuild kit to get the bowl gasket, I thought I'd actually use the parts it came with. So, I replaced the slow jet with the new one and a couple of the other parts. Put it all back together and in the bike to test it. After a few moments of getting fuel in it and revving it, I can now start it in idle position and it idles!
BUT... something else is wrong still... I'm getting fuel spilling out of the bottom of the carb drain. Does this mean the float is stuck? It's supposed to lift and stop that, right? I used the new float needle that came with the rebuild kit. I'm assuming that's whats wrong?

-------UPDATE -----
I knocked the float valve loose, and it closes now. So, now, for the most part it's all working, but have one more issue with the throttle/air. I'm uploading a video of what it's doing.
I can start with idle
I can't throttle/accelerate though. But if I press the little pump-diaphragm only on the side it revs up. So, I'm thinking the throttle/acceleration is starving of fuel that's why it dies?
If I "pump" the throttle, I can get through the issue and it will run at high revvs.
Please look at the video:

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post #17 of 27 Old 08-05-2019, 02:35 PM Thread Starter
 
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Here's one more. trying to tune the fuel/air screw and the idle/throttle as best I can. here's where I'm at. It's close but still dies in that early throttle position...


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post #18 of 27 Old 08-05-2019, 03:24 PM
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Using the accelerator pump just squirts extra fuel into the system, so I would assume it is running lean or something is out of place.

Are you using choke to start it? If not, move the lever 1/3 to 1/2 way towards the rider.

It sounds like the rpms aren't quite as high as they should be, but it's hard to be sure from the video. Try turning the idle adjust ment screw in a little more.

One other thought; is the accelerator pump spring present and installed between the cap and diaphragm?

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post #19 of 27 Old 08-05-2019, 03:33 PM
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Is this part installed with the concave side first (toward the needle)?

Keepin' all the left over parts. Gonna use 'em to build another bike!

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post #20 of 27 Old 08-05-2019, 03:57 PM Thread Starter
 
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Quote:
Originally Posted by flitecontrol View Post
Using the accelerator pump just squirts extra fuel into the system, so I would assume it is running lean or something is out of place.

Are you using choke to start it? If not, move the lever 1/3 to 1/2 way towards the rider.

It sounds like the rpms aren't quite as high as they should be, but it's hard to be sure from the video. Try turning the idle adjust ment screw in a little more.

One other thought; is the accelerator pump spring present and installed between the cap and diaphragm?
Not using choke at all. Tried using it though. It doesn't seem to affect this.
I've tried turning the idle RPMs higher, same issue still.

I didn't see the pic of the part you were referencing, but I know what you're talking about. The brass guide for the main jet needle. Yes, I made sure it was installed correctly, concave towards the needle. I matched the way it was originally installed.

I have a feeling maybe it's the plunger thing. The diaphragm is a bit shrunken and has to stretch to go into the groove correctly. I thought I had it in good enough, but maybe not. I tried an experiment where I covered the air intake horn with my hand while trying to throttle it and it didn't seem to have the problem. Of course, it didn't like to idle with my hand blocking it. But I could cover it up and throttle a little without it dying. I'm thinking this points to an issue with that plunger?

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