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  1. #1

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    problem with DA 50 engine

    seeing that we have alot of specialists around could someone please help with the following

    we have the engine mounted inverted with a custom build pitts exhaust on it. its brand new and still being run in. it starts very easy but for some reason if you pick up the tail wing to level the plane on the ground the revs drop, and if you shake the plane a bit the engine dies. we have tried putting it on an external tank. we have also turned the plane upside down and then the problem is worse. opened the carb and checked it out, there was a little dirt but not much to worry about, there is no air problems due to cowls as the plane is still on the ground with no cowl.

    we have also leaned it and riched it out same problem

    PLEASE help

  2. #2
    car147's Avatar
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    RE: problem with DA 50 engine

    Hi

    You say the engines new, but like here in the Uk, were still getting some of the problems with engines that have not been updated. just older stock, that had issues.

    Yours sounds like the carb problem they had awhile ago. what serial no. is it? Speak to DA or their agent in SA. if any works needed they will do it foc.

    There should be no problem installing any 2-stroke gas engine inverted.

    Hope this helps

    I.A.D30% ExtraL , WH 29% Ultimate,WH Edge 540 Banshee, Raptor 30

  3. #3

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    RE: problem with DA 50 engine

    hi think the serial is

    201b?

    model being wt number? still trying to locate the sa rep,

    thanks for the help !

  4. #4
    Don M.'s Avatar
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    RE: problem with DA 50 engine

    Do a search on RCU about DA50 engines, I did and bought a Taurus .
    I can only please 2 people every day and #2 just left.

  5. #5
    car147's Avatar
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    RE: problem with DA 50 engine

    Mine was 2790 and had the carb update, but not the con rod or crank...[]

    e-mail DA, or ask your supplier........ there should be back up service in South Africa... but in the UK our nearest DA approved repair facility is in Germany.
    I.A.D30% ExtraL , WH 29% Ultimate,WH Edge 540 Banshee, Raptor 30

  6. #6

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    RE: problem with DA 50 engine

    uhmmm mine has the carb update -if it means it has the little black plastic piece mounted to the carb- still no luck moved fuel tank checked electrics. streched the spring put in the gasket still exactly the same!!

    hoooopeless!!

  7. #7

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    RE: problem with DA 50 engine

    ORIGINAL: ougat

    uhmmm mine has the carb update -if it means it has the little black plastic piece mounted to the carb- still no luck moved fuel tank checked electrics. streched the spring put in the gasket still exactly the same!!

    hoooopeless!!

    You are rich on the low end and may be slightly rich on the high end. This is a very common issue on the DA50, they do not like to be rich. Lean out the high needle for max RPM, then richen (drop max RPM by 250) .. tune the low needle until rapid transition from idle to WOT just creates a stumble.... once you feel the stumble.. open the low end needle literally one screwdriver blad width at a time until the stumble just goes away.. it will solve the problem.

    The other thing is that this annoying trait is more likely to happen with petrolem oil and during break in than it is on synthetic oil and after its run a few gallons. I have 3 DA50s, they all did this.. carb mod or not.. but once leaned and once on Synthetic.... never once. Best running engines I have ever owned, in fact, once I get them running perfectly I have not touched the needles... one DA50 I have is 2 years old and 300 flights .. never touch it.

    Run them as lean as you possibly can on the low end and switch over to BelRay H1R at 50:1 after one gallon... you'll never see the problem again.

    DP

  8. #8
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    RE: problem with DA 50 engine

    I know exactly what your problem is and there is an easy solution. A guy at my field had the same exact problem. The problem is that fuel will pool up in the carb/block and when you shake the plane or just land it, the fuel shakes loose and flames out the engine. DA will fix it for free if you ship it to them. I think they ship it back for free as well. It's a warantee fix. If you look at "Does your DA50 do this?" thread. See page 11 post #252 is where the solution is explained. Pic's of the new engine are on post #254. They change the location of the crank pressure pulse and rotate the carb 180 degrees. Post #217 shows an older engine without the mod.

    My new DA50 has this already done. I think you can do this yourself as well.

    http://www.rcuniverse.com/forum/m_17...11/key_/tm.htm (this is the DA50 thread).

    http://www.rcuniverse.com/forum/m_30..._7/key_/tm.htm (this is a thread that has pic's of mine out of the box).


    ORIGINAL: ougat

    seeing that we have alot of specialists around could someone please help with the following

    we have the engine mounted inverted with a custom build pitts exhaust on it. its brand new and still being run in. it starts very easy but for some reason if you pick up the tail wing to level the plane on the ground the revs drop, and if you shake the plane a bit the engine dies. we have tried putting it on an external tank. we have also turned the plane upside down and then the problem is worse. opened the carb and checked it out, there was a little dirt but not much to worry about, there is no air problems due to cowls as the plane is still on the ground with no cowl.

    we have also leaned it and riched it out same problem

    PLEASE help
    Joe AP

  9. #9

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    RE: problem with DA 50 engine

    Yes, that is the problem as JoeAirport has outlined, but it is greatly reduced or enhanced by the low end tuning. If leaned out correctly there will be no pooling of fuel. The petroleum break in oil tends to be stickier on the reeds as well and so going to sythetic and leaning completely eliminates the problem.

    It appears DA has already modified the carb block on this engine so leaning is the only way to fix the problem


    DP

  10. #10

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    RE: problem with DA 50 engine

    Hi all,

    thanks for all the help and assistance, spoke to DA they checked the serial and its one of the old mods and will have to send it to them. ANOTHER 3 WEEKS with no plane!!

    aaah well, thanks again!!!

  11. #11

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    RE: problem with DA 50 engine

    Originally the carb pulsation line was connected to a nipple installed in the crankcase. The modded engines have the pulse line connected to the black insulator block between the carb and the crankcase. If your engine has a line connected to the crankcase you have the older set up that was prone to this problem.

    It's an easy fix to do yourself if the nipple is on the crankcase, just remove the nipple from the CC and plug the hole with a 6-32 grub screw and locktite. Next drill and tap the bottom center of the black insulator block and reinstall the nipple there, you'll need a longer piece of tygon tubing to connect the carb to the nipple.

    Something else you need to make sure of is that the pulse line is secured to the nipples on the carb and the CC. Tygon will swell when exposed to gas and these connections can leak air in a short time. Use a pair of zip ties to anchor the tubing to the fittings and to insure a positive seal.
    Scott

  12. #12
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    RE: problem with DA 50 engine

    I really love working on new engines to get them to run right, by the time you get it running you know it inside and out. I've never had to work on my Unicorn (Taurus) so I don't know what it looks like inside, I just run the heck out of it. I guess I should send it in just so I can have the experience of being without it for a week or two.
    Bob
    Bob
    Nothing is foolproof in the hands of a fool.

  13. #13

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    RE: problem with DA 50 engine

    Hmmmm....Now that I think about it, I've never once had to work on my DA, bolted it on and fired it up and ran the heck out of it. It ran like a bull from the start and never let me down while in use. It did develop a little ringing sound that got my attention and that was resolved in 5 days with no quesions asked and virtually no expense incurred. I have 5 other airplanes so finding something to keep me entertained wasn't an issue and I never once had any symtoms of withdrawl!

    If the fact that mine took a trip and yours hasn't makes you feel good well then so be it. I still can't understand what the issue is with all of this anti-DA, my engine is better than yours because it's never had to go in for any reason, hype anyway.

    Does that really make one brand superior over another anyway?
    Scott

  14. #14
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    RE: problem with DA 50 engine


    ORIGINAL: canavanbob

    I really love working on new engines to get them to run right, by the time you get it running you know it inside and out. I've never had to work on my Unicorn (Taurus) so I don't know what it looks like inside, I just run the heck out of it. I guess I should send it in just so I can have the experience of being without it for a week or two.
    Bob

    Give it a rest
    Welcome to NJ...Where fun comes to die.
    Joe

  15. #15
    canavanbob's Avatar
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    RE: problem with DA 50 engine

    I love you DA guys. You take every opportunity to belittle other brands and hype DA and then cry when somebody makes a little fun of the DA brand. DA makes fine engines, but they did have problems with the 50cc. I'm glad you love your DA, but there is no reason to call Taurus a Unicorn.
    Bob
    Nothing is foolproof in the hands of a fool.

  16. #16

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    RE: problem with DA 50 engine

    If it has wheels, wings, an engine or breasts it's gonna give you problems eventually... which one we all pick (or end up with!) is simply a matter of preference... to each of us one brand or model is better than the other so that battle will never be won.. I am not sure why so many feel it has to be discussed in every forum... there are as many opinions on that subject as there are grains of sand at the beach....

    DP


  17. #17

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    RE: problem with DA 50 engine

    I have a DA50 and am having trouble getting it to run correct. Was tuning it and it seemed to be be getting to the point I wantede it, then it died and now it will fire on choke, then when choke off, it will just start and run out the prime and die. Any ideas?

    This has happended a couple of time. The 1st time, I reset the needles to factory setting and started tuning again.

    Bruce

  18. #18
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    RE: problem with DA 50 engine

    Vapor lock?
    Joe AP

  19. #19

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    RE: problem with DA 50 engine

    A few guys have had gasket blow outs between the carb and the isolator block or the block and the crankcase that reported that problem. I've also seen tygon swell and leak air on the barb that supplies pressure to the carb's pump. Be sure to use zip ties on ALL tubing connections to prevent this from happening.
    Scott

  20. #20
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    RE: problem with DA 50 engine


    ORIGINAL: Shogun

    A few guys have had gasket blow outs between the carb and the isolator block or the block and the crankcase that reported that problem. I've also seen tygon swell and leak air on the barb that supplies pressure to the carb's pump. Be sure to use zip ties on ALL tubing connections to prevent this from happening.
    Like Shogun said, check the gasket. I have sucked a few gaskets on my DA50. The most likely failure point is between the black colored reed block and the engine crankcase. The gasket can suck in on both the top or the bottom sides and cause an airleak. An airleak will cause the described issues as well as a rough and erratic idle.

    SunDevilPilot
    SunDevilPilot
    Cub Brotherhood # 47

  21. #21

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    RE: problem with DA 50 engine

    DA engines are not perfect and they don't walk on water. I was once the proud owner of two. After they both broke rings when they were just under a year old, ( one cost us a 700 dollar plane), i now buy on value.

  22. #22

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    RE: problem with DA 50 engine

    Thanks for all the advice. I pulled the engine out of the plane and pulled off the carb and reed block. What I found was a possible air leak at the joint between the white plastic reed part and the carb. Also found that the carb bolts were not that tight. Noticed that the gasket that goes between the black reed block and the crank case was sucked in slightly, but appeared to still have a good seal. Also replaced the little hose beteen the reed block and carb (appeared to be OK, but it was apart).

    After assembly, it started and appears to run. Will know more when I get it back out to the field and in the air.

    Bruce

  23. #23

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    RE: problem with DA 50 engine

    ok i may have a problem with my da 50!!!?? it is on a wildhare ultimate. i have run it on the ground no problems fly around level, climbs fine, hovers fine, but when i climb up to do a stall turn as soon as i drop the throttle back it dies!??? didnt do it with the cowl off?

  24. #24

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    RE: problem with DA 50 engine


    ORIGINAL: skyriter

    I have a DA50 and am having trouble getting it to run correct. Was tuning it and it seemed to be be getting to the point I wantede it, then it died and now it will fire on choke, then when choke off, it will just start and run out the prime and die. Any ideas?

    This has happended a couple of time. The 1st time, I reset the needles to factory setting and started tuning again.

    Bruce
    You are too lean on the low needle, an engine should not run on choke. Set the high needle as described by DA at max rpm and then work the low needle from idle till you get a good transition to full power with out engine hesitation. When you get good transiton with a reliable idle and throttle up then fly it. I found the high needle to be at about the factory setting and the low to be about 3/8 turn leaner than factory.


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