Removing the accelerator pump diaphragm – Honda CX500, GL500, CX650, GL650

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The accelerator pump on Honda’s CX500, GL500, CX650 and GL650 carburetors is located on the left hand carburetor body if it is present at all. It’s underneath the float bowl – so it’ll be hard to see when the carbs are on the bike but if you have them in front of you upside down it should be pretty clear. Here it is on a Honda CX650E set of carbs:

Here is where the accelerator pump is on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor set and how to remove it.

Closer:

Here is where the accelerator pump is on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor set and how to remove it.

It’s held in with three 4mmx12mm screws with washers, Honda part number 93892-0401200 ( still available new)- use a JIS driver (eBay US, eBay AU, eBay UK) to get these out, they’re not Phillips. Size #1 or #2 from memory. Be mindful of the fact that there’s a spring underneath here, which you probably won’t want shooting off a) into the dark recesses of your garage or b) into your eye.

Said spring, with casing:

Here is where the accelerator pump is on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor set and how to remove it.

Here is where the accelerator pump is on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor set and how to remove it.

Screws with washer removed:

Here is where the accelerator pump is on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor set and how to remove it.

Underneath we have the diaphragm:

Here is where the accelerator pump is on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor set and how to remove it.

That lifts out:

Here is where the accelerator pump is on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor set and how to remove it.

Here is where the accelerator pump is on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor set and how to remove it.

…leaving the bowl and some rust, in this instance:

Here is where the accelerator pump is on a Honda CX500, GL500, CX650 or GL650 Keihin carburetor set and how to remove it.

Now we need to remove the float bowl to get to the next part of the accelerator pump setup – head back to the main carb cleaning page for the next step.

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