da-50 stutter problem,help please
 

Twice today when starting my da-50 imediately after starting, the motor stuttered once then ran fine,The next time i started it,did the same thing,not sure whats going on with my carburator,also it seems i almost always need my choke to start the engine,any ideas whats wrong??The motor does not stall or run poorly in the air,cant figure this one out.It also still pops when flying.

RE: da-50 stutter problem,help please
 

How many cells do you use for ignition?

RE: da-50 stutter problem,help please
 

I use a five cell nimh 1650mah battery...

RE: da-50 stutter problem,help please
 

To take a different angle from what has been mentioned.

Nothing wrong with having to choke an engine to start it. If you did NOT let it warm up and you are lean on the low end (I like it that way) it takes time for it to warm up.
If it still runs rich in the air (4 strokes) it could mean a few things are happening. Positive pressure building on the diaphragm, to rich on high end, etc.

RE: da-50 stutter problem,help please
 

Either a little too much residual fuel in the chamber after the initial start, or still needing to suck up a bit more fuel after the start. Probably the latter. NBD.

RE: da-50 stutter problem,help please
 

Thanks,thats relief.

RE: da-50 stutter problem,help please
 

If you are running a 2 line system you can have a few bubbles after a refuel. This will cause a little hesitation untill the line is full of juice. I also have this problem on my QQ yak with a 2 line , I can see the bubbles through the clear canopy. I also have a WH with a DA fiddy , this has a 3 line, never have a bubbly fuel line.

If you have some pops while flying dont be scart, twist the neddles . Little at a time.

Have fun, Kent

RE: da-50 stutter problem,help please
 

The question of the amount of cells for the ignition battery has its authorization.

With respect to the replies before, I have made an experience concerning the voltage of the ignition battery. A full charged 5 cell ignition battery has up to 7 volts. That causes the failure at the ignition of our ZDZ 50NG, which ignition sticker tells the owner to use 4.8 up to 6 volt batteries. The motor stuttered a while after starting and needed some extra choke until it ran sober. After support of Mr. Amelung (dealer of ZDZ Engines for Germany) he told me to use 4 cells for the ignition battery and the failure wouldn't appear any more.
The stuttering of discusmike's DA 50 (max 6 volts ign bat) may have the same problem. After the first flight the battery recovers and has almost the same voltage as before. The next flight will decrease the voltage and the motor will run without problems further on. After recharging, the stuttering may come up again.
After reducing the ignition batteries of our planes down to 4 cells, the failure of our motors (meanwhile we own 3 ZDZ's and one DA 50) never appears again.
ZDZ has changed the ignition of newer motor revisions now up to 9 volts to avoid voltage overload and to use 2 lipo cells.

Thomas

RE: da-50 stutter problem,help please
 

One other thing,

Gassers will often stumble a bit when they are still cold. Warming them up before punching full throttle helps relieve that quite a bit.

RE: da-50 stutter problem,help please
 

Both of my 50's do the same when cold..

RE: da-50 stutter problem,help please
 

Well,flew today,did not stutter any during starting,but nevertheless was popping away during flight...

RE: da-50 stutter problem,help please
 

If the low end is set right, it will need to be warm before it will transition (like others have said). That popping could be a rich low end. If it's 4 cycling that would explain it. Lean the low end while the engine is warm until it bogs or hesitates (too lean). Then richen it up from there. I think many of the DA 50 problems is a rich low end, especially if the factory settings are used. Check all throttle positions between idle and 3/4 to make sure it's 2 cycling.