Hilborn Technical Support - Mechanical Systems - Fuel Injector Manifolds
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How to adjust the metering valve

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Since the idle mixture is controlled by the metering valve, the purpose of adjusting is to achieve a richer or leaner idle condition. The linkage between the valve and the throttle shaft consists of a threaded turnbuckle, one end has a right-handed thread and the other has a left-handed thread. Loosen both locknuts and turn the turnbuckle. To richen the idle, adjust the turnbuckle so that the arm on the metering valve moves in the open throttle direction. To lean the idle, reverse the procedure. One half to one turn should be ample. Retighten the locknuts.