AiM MyChron3 Basic - Manual (Page 28)

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Spark for
Revs
This option represents the number of spark signals for every
engine revolution. A two-stroke engine has one spark signal per
revolution, while a four-stroke engine has a spark every two
engine revolutions.
To set the Spark for Revs, after having entered the
CONFIGURATION MODE, push MENU/<< until you see
SPARK FOR REVS
Then push MEM to enter EDIT MODE and use MENU/<< or >>
to scroll between three standard values: x1, x2 and /2.
The most common setting for two-stroke, one cylinder
karting engines is x1.
Press MEM to save the changes or VIEW to discard the
changes.
Temperature
measure unit
This function sets the temperature unit; choose between
Celsius [°C] or Fahrenheit [°F] degrees.
To run this function, after having entered the CONFIGURATION
MODE, push MENU/<< until you see
FAHRENHEIT/CELSIUS
Then push MEM to enter EDIT MODE and use button
MENU/<< until you see the proper unit, and confirm it pushing
MEM. Press VIEW to discard the changes.
The °C or °F symbol will appear on the left of the display.