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So I would set the ultralight engines up to run their best (not too lean) on the ground and when you fly up higher it will run just fine.
If you were to go really high then you would have to find a way to lean them out in-flight. But remember, when coming back down, you would have to richen the mixture to prevent seizure.Have a nice day, daffy
Statistics: Posted by daffy1029 — Mon Jan 10, 2005 8:42 pm
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SERVICE BULLETIN
There have been some instances where operators have been using 50 to I gas/oil ratio mixes for the Rotax 185cc engine. These engines are used on the Lazair Ultralight Aircraft. This is not advisable. In the original configuration the factory recommended a 25 to I mixture.
However in the Ultralight configuration a 30/35 to I is recommended - break-in and up to 10 hours of operation use a 30 to I mix ratio. After 10 hours a 35 to I is fine. A high quality petroleum base two-cycle oil is recommended.
NOTE using the larger Rotax engine oil mix ratio of 50 to I can and usually does lead to early crankshaft seal failure. Leaks at these areas can lead to lean fuel mixtures causing engine damage, and leaks at the mag side can result in oil on the points thus causing an engine failure.
Statistics: Posted by Guest — Wed Dec 29, 2004 1:14 pm
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Statistics: Posted by daffy1029 — Tue Dec 28, 2004 11:22 pm
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one of my engines gets no spark after running fine for 4 hours, so Ive decided to go the CDI route, to put an end to the most finicky part of the plane.
Perhaps I should have used the $25 condensers after all, but Im not sure if the condenser is even at fault.
CDI just sounds like the best way to go in any case for smoother running at ALL speeds, and for a more powerfull spark that resists plug fouling.
Statistics: Posted by rayjb60 — Tue Dec 28, 2004 3:51 pm
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