CMS-Japanese Motorcycle Supply Parts


How to remove the jets, emulsion tubes and needle jet - Honda CX500, GL500, CX650, GL650


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Having removed the float bowl you can see the jets:

Here's how to remove the carb jets on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor as shown on MotoFaction.org.

Look closely and you will see the numbers on the jets - the primary main, which screws into the aluminium carb body:

Here's how to remove the carb jets on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor as shown on MotoFaction.org.

The emulsion tube is hidden beneath it. The size is 112 in this case, which means that the jet has a 1.12mm wide aperture... this particular carb has clearly had the jets reversed - the bigger jet should be in the secondary location. Remove it with a screwdriver - make sure it fits well so that you don't damage the soft brass:

Here's how to remove the carb jets on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor as shown on MotoFaction.org.

The emulsion tube, jet removed:

Here's how to remove the carb jets on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor as shown on MotoFaction.org.

Use a flathead screwdriver whose shaft doesn't flare out - it'll have to reach down through a narrow tube and still be a good fit, so a flathead that flares out isn't going to cut it. The Kincrome 100mm x 4mm #32010 is a good match.

Here's how to remove the carb jets on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor as shown on MotoFaction.org.

The emulsion tube:

Here's how to remove the carb jets on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor as shown on MotoFaction.org.

If the tip of the emulsion tube looks familiar, it's what you were looking at in the venturi - and you'll now see only the needle jet sticking up there:

Here's how to remove the carb jets on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor as shown on MotoFaction.org.

Moving on, the secondary main:

Here's how to remove the carb jets on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor as shown on MotoFaction.org.

78 (0.78mm) in this case and it should be in the other location. These are stock jet sizes for these carbs (VB36A), just with their locations swapped.

Here's how to remove the carb jets on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor as shown on MotoFaction.org.

If the jet is unscrewing and taking the brass emulsion tube with it, use a 7mm wrench to hold the emulsion tube while you remove the jet:

Here's how to remove the carb jets on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor as shown on MotoFaction.org.

Make sure you know which one came from where as if you get them backwards your bike isn't going to work well.

Here's how to remove the carb jets on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor as shown on MotoFaction.org.

Here you can see the difference in aperture size:

Here's how to remove the carb jets on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor as shown on MotoFaction.org.

Now you're left with this:

Here's how to remove the carb jets on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor as shown on MotoFaction.org.

The black rubber plug covers the idle jet and it's removable by lifting it out:

Here's how to remove the carb jets on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor as shown on MotoFaction.org.

The CX/GL carbs have either a pressed-in idle jet or a screw-in one - this one is pressed in and we shall not remove it as we can get the carbs clean without doing so (there's a risk of damage with most removal techniques):

Here's how to remove the carb jets on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor as shown on MotoFaction.org.

If your carbs have a removable idle jet you will see this instead:

Here's how to remove the carb jets on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor as shown on MotoFaction.org.

Removable with a screwdriver - make sure it's a good fit, you don't want to round this one out:

Here's how to remove the carb jets on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor as shown on MotoFaction.org.

The brass fitting that the secondary main jet was screwed into is another emulsion tube - you can unscrew it with a 7mm wrench:

Here's how to remove the carb jets on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor as shown on MotoFaction.org.

8 little holes (they run through both sides):

Here's how to remove the carb jets on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor as shown on MotoFaction.org.

Here's how to remove the carb jets on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor as shown on MotoFaction.org.

Beneath that - and what you can see remaining in the venturi - is the needle jet:

Here's how to remove the carb jets on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor as shown on MotoFaction.org.

It will simply press down - if needs be use something soft like a pencil to push it so as not to damage it:

Here's how to remove the carb jets on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor as shown on MotoFaction.org.

Blurry, will re-shoot:

Here's how to remove the carb jets on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor as shown on MotoFaction.org.

The bottom end:

Here's how to remove the carb jets on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor as shown on MotoFaction.org.

Finally is the idle screw (part number 16016-410-601 (screw set A), eBay US):

Here's how to remove the carb jets on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor as shown on MotoFaction.org.

Here's how to remove the carb jets on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor as shown on MotoFaction.org.

Beneath that is a spring:

Here's how to remove the carb jets on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor as shown on MotoFaction.org.

Beneath the spring is a washer:

Here's how to remove the carb jets on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor as shown on MotoFaction.org.

and an O-ring which need to be removed. The screw, spring, washer and O-ring are part of the set 16016-410-601.

Here's how to remove the carb jets on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor as shown on MotoFaction.org.

...and that's it! If you're following the carb cleaning guide, go back to the main carb cleaning page for the next step.



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