Lazair.com

Im updating this thread on my engine experiences.

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.

Hi,
Just a note- Wildfire recomends 24-1 ratio for the fuel mix in the 185 Rotax's. So if you are breaking your engines at 30:1, isn't that a little lean? Daffy

Rotax 185 aircraft engine -Reg's Newsletter 2

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.