The several Rans I've seen have three levers on a common shaft with single friction tightening bolt, mounted on the forward left side of the seat. From the outside 'choke', throttle & trim.
The choke is a simple enricher fuel feed jet opened & closed by a lever to a second fuel source, via a pad in the Bing carb in a side chamber. It increases fuel flow through a separate jet to richen the mixture for a cold engine but the throttle needs to be closed for full suck effect on it. It's an on/off device & does not prime the engine, nor offer much partial 'strangling' (unlike a butterfly choke). Once the engine warms up, it should be shut off.
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