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The jet needle (amongst other components) contributes to CX/GL fueling across ~50%-100% throttle opening.
Here's your Honda CX500, GL500, CX650 or GL650's slide piston with the jet needle visible coming out the bottom:
The jet needle and jet needle come as part of a set from Honda, part number 16012-415-671 (eBay US). At the top of the slide you have a small plastic piece:
Looking down from the top:
It lifts out - note the little O-ring that runs around the middle:
Looking down from the top now you should be able to see a slot for a flathead screwdriver:
Unscrewed:
The underside of that piece:
The jet needle will now be able to be lifted out:
Top of the jet needle - note that there aren't any grooves to change a clip into like some carbs have; to adjust the mixture here you need to use shims:
Tip of the jet needle:
It has the characters 2 5 D inscribed around it:
The underside of the slide piston:
And you're done. If you're following the carb cleaning guide, go back to the main carb cleaning page for the next step.
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