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Buying an ultralight - charge for your time to bring it up to flying condition.
Ultralight aircraft safety - you are an accident looking for a place to happen without fuel!
UltralightNews.com
Many older ultralights came equipped with 503 Rotax or Hirth engines using a
single Mikuni fuel pump. Both single and dual carb 503 Rotax/Hirth engines
should use the dual Mikuni fuel pump .
The pump should be; rubber mounted, a maximum of 12 inches, from the
vacuum source on the engine, away from heat, and with the vent on the pump,
(found in the middle of the vacuum elbow) facing down.
Another common problem on aircraft equipped with
either the Mikuni or Bing carburetor was wear in the
needle valve and or retaining clip.
This wear would cause the needle to fall down into
the carburetor resulting in the engine dropping back
to an idle.
Rotax updated the clip, needle and retaining cup to
help prevent this.
Ultralight Aircraft, buying a used ultralight aircraft,
how to buy a used NOT abused ultralight!
Recommended replacement parts: The fuel shut off valve, fuel
filter, fuel line , primer lines, rubber intake manifold(s) ,
primer bulb, carburetor bowl gasket(s) main jet and idler jet,
and gas tank grommets .
With storage, gas and UV deterioration will make it necessary for most if not all of
these to be replaced or cleaned. If the engine has a sponge
air filter, replace it with a K & N air filter.
On dual carb engines a dual K&N airfilter is recommended.
It’s shorter profile helps support the carbs and taking some of
the load off of the intake sockets.
Note the tabs for safety wiring the airfilter to the carbs.
