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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
For a short period of time Rotax shipped out carburetors which had two pins in the slide throat area. It was found that these pins
had a tendency to break off and enter the engine possibly causing piston damage.
Identification of this problem carb can be done by simply looking at the side of the carb opposite the idle adjustment screw, if two
pins can be visibly seen then your body needs updating, if a solid block is found you are okay.
Another problem encountered on early model carburetors equipped with a plunger on the side of the carb, was the bending of the
float arms. Because the plunger, when used presses down on one side of the float assembly it was found that
over a period of time bending of the float arm occurred resulting in improper fuel levels in the float bowl
chamber. If your craft is equipped with this plunger a simple cure is not to use it.
Another problem area is in the top cap on the Bing carb, the one that screws down onto the top of the carb
body and retains the throttle cable. In what looks to be the center of the cap is located a screw in fitting,
which can be used to adjust the length of throttle cable.
In fact the screw in fitting is not located in the center but is off to one side.
If installed incorrectly this can result in wear on the throttle cable where it
passes through the bottom of the fitting, as the cable now pulls at an angle and
rubs against the outside of the fitting during throttle operation.
One other problem on early model Bing carburetors and intake manifolds was
that the two aluminium protrusions, which are coupled together with a rubber
intake manifold flange, were smooth.
This allowed the carb body to rotate in flight, in some cases causing engines to
leak excessive amounts of fuel and or simply quit.
Later model engines were kernelled on both the intake and carb sides to prevent this
from happening. Also make sure that the rubber intake manifold flange is installed
with the arrow on its side pointing towards the engine, for proper fit.
Troubleshooting the Rotax line of two stroke ultralight
aircraft engines.
There are two vent tubes located on the side of the Bing carb. Do not connect any additional hoses to these vents, or vent them
outside an enclosed engine installation.
By venting outside the engine cowling you create two
different air pressure areas, that of the outside air, and
that of the air inside the engine cowling, which can effect
you fuel mixture.
Recently Rotax has introduced a modification to the vent
tubes. They are now one line joining the two vents with
holes in the bottom to vent the carbs.
These vent holes, and provides for even pressure
distribution to both sides of the float chamber. Make sure
that these two vent or balance tubes are not pinched off
in any way, as it will effect the carb mixture.
Rotax Aircraft Engine Older Style Vent Lines
Rotax Aircraft Engine Updated Vent Lines
