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Fuel level on aftermarket carburetor?

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Fuel level on aftermarket carburetor?

PostAuthor: hypophthalmus » Sat Sep 22, 2018 12:38 pm

Does anybody know if the fuel level on an aftermarket carburetor is likely to be the same as OEM spec?

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Re: Fuel level on aftermarket carburetor?

PostAuthor: bstig60 » Sun Sep 23, 2018 8:30 am

Yes, it should be close to the same as stock.
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Re: Fuel level on aftermarket carburetor?

PostAuthor: Canadian Star » Mon Sep 24, 2018 1:41 pm

I'm not sure what you mean by "aftermarket" carburetor.
Is it the same make/model carburetor as the original?
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Re: Fuel level on aftermarket carburetor?

PostAuthor: hypophthalmus » Mon Sep 24, 2018 1:47 pm

It's one of the Chinese copies of the OEM carburetor.

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Re: Fuel level on aftermarket carburetor?

PostAuthor: juro1 » Wed Oct 03, 2018 7:55 pm


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Re: Fuel level on aftermarket carburetor?

PostAuthor: hypophthalmus » Sat Oct 06, 2018 9:51 pm

Are you supposed to measure the level with the tube straight up and down, or parallel to the bowl cover?

Does it matter if the bike is standing straight up and down, or on the side stand?

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Re: Fuel level on aftermarket carburetor?

PostAuthor: hypophthalmus » Sat Oct 06, 2018 9:58 pm

Actually, the manual says the bike should be level. Still not sure about the tube though.

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Re: Fuel level on aftermarket carburetor?

PostAuthor: Flyingdog » Mon Oct 08, 2018 1:45 am

hypophthalmus wrote: Still not sure about the tube though.

Pictures shows measuring tube held vertical. If held horizontal..I would think the fuel would not stay in the tube. Or maybe I'm not getting the concept of what you mean by being held in "parallel of the carb". Parallel as in up & down as the way the float bowl sits? Then, I'd was say: yes..that is parallel and/or vertical as in up & down as you sit looking at it... holding the tube next to the carb.
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Re: Fuel level on aftermarket carburetor?

PostAuthor: hypophthalmus » Mon Oct 08, 2018 9:50 am

The bowl cover is at a slant rather than perfectly vertical.

I found one picture of someone checking it by holding the tube flat against the bowl, but I'm not sure if that's right or not.

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Re: Fuel level on aftermarket carburetor?

PostAuthor: Flyingdog » Mon Oct 08, 2018 12:07 pm

Wouldn't matter how much they're tilted in you case. Think of a glass of water..no matter how much you tilt the glass, the water will be level. As in line of sight in a vertical plane. I would just do it how you think. Besides...those bowls are out there in the open and are easy peasy to remove and readjust the floats if your line of sight is off.
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Re: Fuel level on aftermarket carburetor?

PostAuthor: hypophthalmus » Mon Oct 08, 2018 8:47 pm

Well... it was actually fairly high. Probably around 7mm below the line rather than 16.5-17.5mm.

I'm not really sure what to do with this information now, since I'm chasing a lean condition. Definitely not running rich.

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Re: Fuel level on aftermarket carburetor?

PostAuthor: bstig60 » Wed Oct 10, 2018 1:29 pm

With the bike on the centerstand on a level surface, the fuel level should be 1-2mm below the bowl gasket line. If your carb has a drain at the bottom of the float bowl, take a clear tube and attached it to the drain, turn the tube up along side of the float bowl with the end above the gasket line and open the drain. The fuel level will be where the fuel stops in the tube .....
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Re: Fuel level on aftermarket carburetor?

PostAuthor: hypophthalmus » Wed Oct 10, 2018 2:43 pm

I'm not sure what you mean by gasket line.

The manual says to use a line on the bowl cover. The non-OEM bowl cover doesn't have this line, but I just made one with a caliper and a marker.

According the manual, it should be 16.5mm to 17.5mm under that line. I did as you described, but its ~7mm instead.

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Re: Fuel level on aftermarket carburetor?

PostAuthor: Flyingdog » Wed Oct 10, 2018 3:53 pm

hypophthalmus wrote:I'm not sure what you mean by gasket line.


Won't apply to yours.
That's just a reference/measuring point where the float bowl meets the bottom of the carb on "vertical" style carbs used on other Viragos.

You'll probly have to get in there and bend the tang, so the float will shut the flow of fuel off at whatever point the manual says for that carb. May take a few tries taking the bowl off and on (bending the tang) to get it set right, so the fuel level finally settles to the point in bowl (and the level in the tube) you need. I'd have to look thru the 535 carb to get the measurements.
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Re: Fuel level on aftermarket carburetor?

PostAuthor: Flyingdog » Thu Oct 11, 2018 1:31 pm

Looked around abit. What I've found is the fuel measurements for the Mikuni BDS34 (OEM) is suppose to be 13.5mm-14.5mm. Now, those numbers you gave, were those that came with your aftermarket carbs? You could do some measuring between the two and if everything seems the same within the fuel chamber (physical dimensions, jet block etc etc etc)....I'd just use Yamahas' measurements. You mention that it's still rich. Don't forget to super clean out the pilot air jets. There's two in those carbs. One in the edge of the intake bore and one in the slider/needle bore. (Under the diaphragm) they can lead to a rich mixture. I think, they are removable too. Not sure..I don't do 535s.

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Re: Fuel level on aftermarket carburetor?

PostAuthor: hypophthalmus » Thu Oct 11, 2018 1:51 pm

It's actually a BDS26 on a xv250. The numbers came from the manual.

And it's running *lean*, not rich, even with the higher fuel level.

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Re: Fuel level on aftermarket carburetor?

PostAuthor: Flyingdog » Thu Oct 11, 2018 2:22 pm

Ah..IC..I'll have to leave this to someone familiar with the 250. I should have said only thing I could come up with was the 535 carb (hence the numbers). Was looking as the operations were similar, as they're both horizontal mounted carbs. My Bad :;: Only thing I can suggest is making sure "everything" is clear and open...IE: jets (are they stock? maybe go up size or two) needle clip setting? (maybe lower the C-clip) all pilot jets clear? Emulsion tube clear (all the holes need to be clear/open), slider move smoothly with abit of resistance? Needle have a slight movement within the slider? (as in not hang'n up somehow)..etc..etc.

If ya just can't get it right..bite the bullet and go back to OEM and rebuild those.
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Re: Fuel level on aftermarket carburetor?

PostAuthor: hypophthalmus » Fri Oct 12, 2018 5:07 pm

Well... I put it to oem spec, but now it's running terribly. Worked fine for a bit, but then it apparently kept running out of fuel in the bowl.

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Re: Fuel level on aftermarket carburetor?

PostAuthor: hypophthalmus » Fri Oct 12, 2018 5:39 pm

There's another thread about the lean condition ( viewtopic.php?f=6&t=60550 ), and I guess I've figured out the answer to my question about the non-oem fuel level. So this should be marked as solved.

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Re: Fuel level on aftermarket carburetor?

PostAuthor: hypophthalmus » Fri Oct 12, 2018 5:40 pm

Sort of figured out anyways. It could still have been wrong, but it was originally 8mm (measured this time).

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