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They work like a two barrel carb on a car.
The left carb is the primary and is the only one working at low power settings. It's the only one with an enricher.
At larger throttle openings the right carb kicks in via a linkage for more mixture flow/power.
The idea is a higher mixture velocity at low power which increases tractability and torque down low. This is a priority for an XR. Then to get max power at higher RPM's the secondary kicks in.
It works well but IMHO is needlesly complex. I suspect this is why Honda did away with it after only two years.
I am fortunate my bikes carburation is currently excellent and I have no intention of messing with it in any way! :wink:
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