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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
One other commonly reported problem is in foreign material entering the system. This can be plastic from the manufacturing
process, or simply cork lining used to seal the gas cap. Before installing any gas tank make sure that it is clean and free of any
debris.
Fuel: The recommended fuel for the Rotax engine is PREMIUM UNLEADED, using
a GOOD QUALITY two stroke oil, the recommended mixture is 50 to 1. Fuel
containing ethanol isn't recommended, although Rotax indicates a blend of up
to 10% can be used. ETHANOL will adversely effect most gas line components!
For best performance this fuel should be fresh, and under no circumstances
should premixed fuel be stored in bulk for any length of time, as the oil tends to
reduce the octane rating of the fuel in storage.
Our testing has shown that a 5 gallon tank mixed with oil will loose 20 to 30% of it’s octane rating when in storage for 4 weeks!
If storing your aircraft for any length of time be sure to add fuel stablizer to your tank and run your engine until the fuel has
reached your carbs.
Troubleshooting the Rotax line of two stroke ultralight
aircraft engines.
Another problem is with gas caps that have a small pin hole in them for a vent, this holes should be checked to make sure it hasn't
become plugged. If you have one of these tanks a solution is to drill a small hole in the handle, at its highest point.
Another problem with some of these tanks is that they have a steel check valve located in the tank fuel outlet, in some cases this ball
is to heavy for the Mikuni fuel pump to lift completely, causing a fuel starvation problem.
Make as few restriction in your fuel system as possible.
Some pilots have installed electric fuel pumps into their systems, in addition to the Mikuni pump. There are several potential problems
with this.
First the electric pump is capable of producing considerably more pressure than what the fuel system is set up for, when the pump is
turned off it is an added restriction. The second system should a mirror of the first system, with it’s own pickup and route to the carbs,
bypassing the vacummn fuel pump.
