Replacement hall sensor for the UMS 5-75cc, the five-cylinder 75cc four-stroke radial from UMS.
Function: it is the Hall effect sensor, which reads the magnet ring on the cam gear and tells the ignition when to fire.
The reason this ends up on an order: a failing Hall sensor gives an intermittent misfire or a no-start that is hard to trace, so these are a routine spare on ignition-equipped radials.
Fitting note: Check the air gap to the magnet ring and the condition of the connector before condemning the sensor.
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