I already sent two email for Desert Aircraft and I didn't have answer

I am placing the email that I sent here to them.


Hello, i am a modeler here in brazil, i bought a DA-50R motor serial number DA0694, i am having problems with it´s operation.

What happens is that if i get a stable idle, i don't get a top end , and if i get a top end i don't get the idle (it shakes to bad, like to rich).

I am using gasoline 100 octanas and oil Motul 800 as lubricant in the proportion of 40:1, i am adjusting it as described in the user's manual.

Making it short, i can not get a soft idle, only when i close the low neddle to 1 turn , and that way i cant have a trothle response, because it dies when i push the stick up.

I already opened the carburetor and search for dirt or similar thing but the carburetor is clean and all perfect.



Could you give me some orientation, i can not send this motor for E.U.A because I reside in São Paulo -Brazil.



Thanks very much.



Fernando Teixeira

Do you know what elevation you are at?

I'd try resetting your needles to 2 turns high and 1 1/2 low and see what happens. Fly the plane and get some time on the engine. Don't worry about a smooth idle when it's new. You need to run it.

Fernando,

Some DA 50s below a certain serial number (I think somewhere in the 2000s) need to be overhauled as they have a problem. I think if you send it to DA, they will do it free of charge. I don't think they cover shipping.

Good luck

Speedbird

Carbs are not rocket science...One of the biggest problems with new engines is trying to run with "factory" needle settings...If the carb is working properly and is set correctly a brand new engine will idle just as well as one that has been run for years....Only thing different is how loose the crank is and how well the rings seal...This will let the engine idle a little slower....
The key is how the carb is adjusted, not the length of time the engine has been run..PERIOD..
The high speed needle has absolutely nothing to do with how the engine idles...But the low speed needle, if opened too far, will affect the high speed needle setting...
Open both needles 2 turns, set the high for max rpm, then adjust the low, not the other way around....You should be able to get a good idle at 1800 rpm, with good transition, by leaning out the low needle a little at a time and re setting the idle speed as you go along...After the idle and transition are good the high speed needle may need to be re set...
If the reeds under the carb are not seating properly you will never get a good adjustment on the carb....

If your engine dies when you open the throttle you are too lean richen it an 1/8 of a turn at a time till you get good transion from idle.

Set the high throttle to max RPM then back it off about 200 RPM firs then set the low end as described above.

Good luck, well if you fallow my instructions you wont need luck will you

I am not an engine xpert but I did stay at a Holliday Inn last night[>:]
I am watching you Larry

I believe, is problem of manufactures.

because I already did all possible adjustments of everything and I didn't have success

thanks

hi,

You would know how to tell me where it is the problem that exists?

thanks

There were two problems that DA fixed that I am aware of: One was the crank and bearings were bad on some models. The other was the pulse pickup for the pump in the carb caused the engine to flame out at idle when the plane was moved suddenly. I'm not sure if what you are describing is fixed by either of them. Maybe the crank if anything would cause vibration.

I had a problem with my DA50 almost identical to the problem you are having. In addition to what you descibe, mine also would not prime unless spun over with an electric starter. At idle it shook like crazy and was way down on top end. When I called DA and described the problem to them I was promptly informed that I was lying. Anyway, after a long argument they agreed to send me a new carb. Put the new carb on and it runs just fine now.