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Re: No gas to carbs - nada - huh?
MrUnix #601627 05/19/2021 9:05 PM
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You can put a small clear tube on the bowl drain and hold it up along side of the carb then open the drain and the level in the tube is the level in the bowl. Should be about even with the top of the bowl with the bike standing up straight.
The o rings only need to be replaced if damaged on the pilot screws, had mine out several times over the years and never replaced, just a very light smear of grease when putting them back in.
Problem I found with HD dealers is the jets are too big, they run a single carb on a larger engine. Better off with a Honda dealer or other jap makes, they used the same carbs as us on certain models too.


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Re: No gas to carbs - nada - huh?
MrUnix #601629 05/20/2021 3:52 PM
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The Harley CV40 and Triumph CVK36 carb circuits are essentially the same. My go to local pilot jet supplier was an indy hog shop, which has since closed.

If with all the decrudding you did, the pilot screws were not removed & checked, well...you just don't know...

Re: No gas to carbs - nada - huh?
MrUnix #601630 05/20/2021 4:02 PM
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The inability to edit posts is a pain in the arse...above post was supposed to say "pilot circuits are essentially the same"...

Re: No gas to carbs - nada - huh?
MrUnix #601880 09/22/2021 6:56 PM
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Ok guys - sorry for the delay, but a ton-o-crap happened since my last post and I had to put the bike on hold while I dealt with the other issues. Anyway, I got everything back on the bike and she fired right up and purred like she was meant to. It appears that I just didn't do a good enough job cleaning the first time (and should have pulled the idle mix screws at that time as well). Another lesson learned the hard way. However, I haven't been able to take her out on the road yet because...

Now she has a fuel leak frown

Seems like it's coming from the left side carb where the fuel line (tube) enters, just after the 'T' fitting. I looked at the diagram and it seems that there are some o-rings that seal the line, and I guess that one has now failed.

My question for the experts is: can I replace that o-ring with the carbs still on the bike or am i looking at pulling them for a third time?!?!? I can't see how, but hoping maybe there is a trick or two that can be used.

Thanks,
Brad


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Re: No gas to carbs - nada - huh?
MrUnix #601881 09/22/2021 7:43 PM
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You might be able to remove just one but it will be much easier to pull them both to do the job. Make sure it isn't a float issue and not coming from that fitting. You can put a piece of clear tube on the bowl drain and hold it up along side the carb and open the drain. Fuel will fill the tube to the level in the bowl unless the float isn't closing. The bike needs to be upright to try this not leaning over on the side stand.


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Re: No gas to carbs - nada - huh?
The_Dog33 #601882 09/22/2021 8:02 PM
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Originally Posted by The_Dog33
You might be able to remove just one but it will be much easier to pull them both to do the job. Make sure it isn't a float issue and not coming from that fitting. You can put a piece of clear tube on the bowl drain and hold it up along side the carb and open the drain. Fuel will fill the tube to the level in the bowl unless the float isn't closing. The bike needs to be upright to try this not leaning over on the side stand.

I would put my money on the float also. Pull the carbs & do it right...much less hassle in the long run that way.

Re: No gas to carbs - nada - huh?
MrUnix #601883 09/22/2021 8:31 PM
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Now I'm confused... if it was a float issue, where would the leak be? It sure looks like it's coming from where the fuel tube enters the left carb, and the tube and "T" fitting now turn easily, where they didn't before. The issue is almost exactly like this one described over at the rat.net site:

https://www.triumphrat.net/threads/fuel-leak-carb-inlet-crossover-tube.69161/

I adjusted the float and installed new float valves, so I would be surprised if that was it.


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Re: No gas to carbs - nada - huh?
B02S4 #601884 09/23/2021 11:57 AM
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Well...if you are certain that it isn't the floats, given that you already replaced them, then it is possible a seal might have failed. Only way to know for sure...pull the carbs & check.

Re: No gas to carbs - nada - huh?
MrUnix #601885 09/23/2021 7:18 PM
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Thing is I would be sure it isn't the float before pulling them. It very well may not be.


I learned all I need to know about life by killing smart people and eating their brains.
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Re: No gas to carbs - nada - huh?
MrUnix #601886 09/23/2021 11:07 PM
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I'll do the tube thing to check the float level again, but the problem is as soon as I open the petcock to let fuel flow, it starts dripping from the bottom of the fuel inlet tube as it enters the carb. I did put a cup under it and fired the bike up to test, and she ran perfect, which I thought would rule out a stuck float or improper float level.

Thanks guys.
Brad


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Re: No gas to carbs - nada - huh?
MrUnix #601887 09/24/2021 6:57 AM
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If you can see it coming directly from the inlet then chances are that is leaking but the bike will run with the float not adjusted right and leak when not running.


I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
Re: No gas to carbs - nada - huh?
MrUnix #601890 10/07/2021 6:59 PM
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So...what's the verdict?

Re: No gas to carbs - nada - huh?
MrUnix #601893 10/10/2021 12:51 AM
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Originally Posted by B02S4
So...what's the verdict?

Stay tuned...


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Re: No gas to carbs - nada - huh?
MrUnix #602358 08/16/2022 12:00 AM
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Wow - talk about procrastination! I can't believe it's been almost a year since I last messed with this!

Turns out it was a bad o-ring on the fuel rail - the one opposite the side where the 'T' fitting is. O-ring was flattened out and there was noticeable corrosion in the groove it sat in.

For those who face a similar repair - the o-ring in question is 5.8mm (ID) X 1.9mm. The one on the other side (T fitting side) appears to be a bit larger, but is listed as the same size. I had a box of (nitrile) metric o-rings, and the 6mm X 2mm ones appear to fit just fine. The T fitting side actually has two grooves, so I doubled up on that side just 'cause.

To split the carbs, you only need to remove the one solid bracket between them (4 screws), and the long bolt that runs between them. You also need to remove the choke linkage (pay attention to the spring locations). If you are careful, you can get the fuel rail out without messing with the throttle connection and associated springs.

I'm hoping this is the LAST damn time I have to yank those carbs!

Cheers,
Brad


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Re: No gas to carbs - nada - huh?
MrUnix #602359 08/16/2022 5:42 PM
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Glad you got it sorted out. Good info!

Re: No gas to carbs - nada - huh?
MrUnix #602360 08/16/2022 8:15 PM
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My junk still doesn't run. LOL I am probably buying Wendy's 04 America back she only has 21,000 miles on it. I'll try her CDI on mine to make sure the Firestarter I bought wasn't faulty.


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Eat right ,Exercise ,Stay fit, Die Anyway!
Re: No gas to carbs - nada - huh?
The_Dog33 #602361 08/16/2022 8:49 PM
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Originally Posted by The_Dog33
My junk still doesn't run. LOL..

I sure hope you are referring to one your bikes! smile

Re: No gas to carbs - nada - huh?
MrUnix #602362 08/17/2022 8:16 PM
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LOL, yes still my Speedmaster, but haven't had much time to do anything more with it.


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Eat right ,Exercise ,Stay fit, Die Anyway!
Re: No gas to carbs - nada - huh?
MrUnix #602390 08/28/2022 5:42 PM
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Ha... time is like storage space - you never seem to have enough wink

Well, I got a hundred or so miles on the bike since putting her back together, and she is running great. Only issue I am now having is I can't get the idle down under around 1500 rpm no mater how much I turn the adjuster. Turning it for slower idle does absolutely nothing now, and the rpms just stay right around 1500. I'm guessing that it's a result of (1) having removed the idle mixture screws when cleaning the carbs, and/or (2) needing to re-sync the carbs since I split them apart to replace the fuel rail o-rings.

Not sure about the sync though, since I never did disconnect the linkage between the two carbs and it's still at it's factory default setting - but I'm sure it wouldn't hurt either. I don't have the equipment to do it, so I would wind up having to purchase something.

Thoughts? I've never sync'd carbs, but it looks dirt simple. Just not sure I need to and don't really want to spend more money than I have to. Never adjusted the idle mix screws on this bike either, so that is rather intimidating (at least to me!!).

Cheers,
Brad


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Re: No gas to carbs - nada - huh?
MrUnix #602394 08/29/2022 11:05 AM
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The carbs are easy enough to sync, if you have access to a decent set of vac gauges. That is a must do, IMO.

The pilot screw o-rings can be easily damaged upon removal, that is something to check...& the washer that goes between the spring & o-ring must be in the right spot.

With the bike in neutral & the engine warmed up an running, if you blip the throttle, do the revs "hang" a bit, or drop back right away?

Re: No gas to carbs - nada - huh?
MrUnix #602397 08/30/2022 4:39 PM
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Ok, I think I'll make me one of those DIY manometer things to do the sync. Those cheap vacuum gauges I see on Amazon and places seem to jump around too much and a lot of people recommend against them.

I think I may have discovered what is going on though. I took her out for a short 1/2 hour ride today and got her good and warm. What I discovered is that when I blip the throttle, it pretty much comes right back down (to ~1500 rpm), perhaps with just a very slight hang. But - when I rev her up and take my hand off the throttle, letting it snap back by itself, the RPM drops down to ~1000, perhaps slightly less! Give her throttle and then back to idle with my hand on the throttle, and it will only return to ~1500 rpm.

So it apparently is something with the linkage/cables. I did notice that the return cable looked a bit looser than it had before disassembly, so that most likely is the culprit. Other than the idle RPM though, the bike has been performing flawlessly... quick throttle response, plenty of power throughout the rpm range, and I took her out on the Interstate and hit ~90 mph smooth and easy. I need to consult the manual to see what is needed to adjust those cables. I also noticed that the rpms will kick up a bit when the front wheel is turned all the way to the left - further indication that something may be going on with the cables.

I'd still like to tune the carbs a bit, and I did get one of those "D" sockets a while back so I could do it. Now I just need to get one of those round 'finger ratchet" things to make turning them easier.

And to think that all of this misery was completely self inflicted!

Cheers,
Brad


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Re: No gas to carbs - nada - huh?
MrUnix #602398 08/30/2022 5:00 PM
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Yep, check & adjust those cables!

I have an inexpensive set of dial gauges that work just fine; the key is getting the vac line damper/snubber set properly to minimize unnecessary oscillation.

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