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http://www.ultralightnews.ca/hirth-engines.htm Page 10 of 31
The Ultralight News
2.4The operation of dual carburettors
The throttle valves of the Bing carburettors are operated via two Bowden type cables. It is advantageous to
run both cables from the throttle into a single cable by means of a Y-shunt or cable splitter.
If at all possible, both throttle cables between the Y-shunt and the carburettors should be the same length.
In idling position (both throttle valves sit on the idle ? adjusting screw) there should still be enough play in
the throttle cable to ensure that the throttle valves can reach the idle position stop.
It is essential to ensure that both throttle valves in the Bing carburettors are completely synchronised.
The idling position of the throttle valves must be equal in both carburettors. To do this, use the idle adjusting
screw to bring the throttle valves to the same level in idle position.
Measure and match the size of the apperture of both slide valves.
When the slide valves are drawn upwards they should lift simultaneously from the idle-adjusting screws and
open the outlet together.
2.5Securing the spark plug leads in a hanging (inverted) installation
If the engine is installed in a hanging or inverted position, the sparkplug leads should be secured so that any
breaking or interruption of contact by engine vibrations is prevented (support or secure by wires).
2.6Switching off the Ignition System (dual ignition)
It is essential that both ignition circuit breakers are located on separate grounding switches. It is important
each earthing wire is installed separately to avoid circuit failure. This method also aids the operator to check
each ignition side when the engine is operating.
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