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Troubleshooting the Rotax line of two stroke ultralight aircraft engines.
Troubleshooting the Rotax line of two stroke ultralight aircraft engines.
UltralightNews.com
if there is spark one way, and not the other then the box is still good.
If the box does happen to fail on you, it can be simply disconnected from the system and your spark will return. It is suggested
however that you replace the box, at the earliest possible time as it does play an important role in extending the life of your
engine.
The final problem encountered in the ignition system of the Rotax engine is in the use of an ignition switch which simply joins the
two black leads from the magneto together to shut the engine off.
This is not the recommended switch. In all applications the proper switch is referred to as a four pole switch. This switch allows
both black leads to be fed into one side of the switch, while the other side goes to ground. When the switch is operated to shut
the engine off both coils are grounded, ensuring a complete ignition shut off.
Rotax Bing 54 Carburetor Troubleshooting Tips:
In most applications the Rotax engine uses a Bing 54 carburetor. In adapting the
Bing for ultralight aircraft use several problems have been encountered.
One problem that has been reported is the failure of the retaining clip of the
jet needle, located in the carb slide, due to vibration and fatigue . This failure
allows the jet needle to fall down into the main jet cutting of the supply of
fuel to the engine.
The engine still runs but at an idle. This should be an area of regular
inspection.
Troubleshooting the Rotax line of two stroke ultralight
aircraft engines.
Another reported problem encountered by pilots with the ignition system on the Rotax points
equipped engines is in the connecting of a tachometer to the two black leads used to shut the
engine off.
When connecting a tachometer to the Rotax points equipped aircraft engines connect it to the
two green leads coming from the magneto. These leads are usually connected to two yellow
leads, making for a yellow/green, yellow/green combination. To connect the tachometer simply
separate the two green leads from their two yellow counterparts and connect the tachometer
leads, to two greens.
Under no circumstances should a tachometer be connected to the two black leads.
Another problem encountered with the ignition system is with the ignition suppressor box. This
box is generally located on the Rotax starter recoil, is a brass color, with two leads, a brown and
black, coming out and joining into the ignition system.
When this box fails it can cause a complete loss of spark to one or both coils. A way to quickly check the box is to reverse the leads,
