RE: Does your DA50 do this?
 

Maybe RCU would start another new category--Assumers..Think of all the fun we could have ASSuming about new engines..

RE: Does your DA50 do this?
 

That's a great picture but I'm even more confused now. Both of my DA50's have exactly the same pressure output as you show in your photo but I bought both of my engines in July of 2003. Is this the supposed "new" fix? If so, how's it that my DA's have been configured this way for almost two years?

RE: Does your DA50 do this?
 

I wasnt sure if the pic would be of use I just know they moved some port to make the fuel pooling in front of the reed valves less of a problem. I was hoping that some one with an older motor would see a differance as these are the only ports i see externally I hope I never have the opertunity to take this thing apart to investigate.

RE: Does your DA50 do this?
 

Branded what are the serial #'s on your motors

RE: Does your DA50 do this?
 

Ralph,

You've got me a little confused on this one. If you just got done setting the low needle for best idle, and then you adjust the low needle again for good transition, you just LOST your setting for the idle.:eek: Did you mean to set the high needle for good transition.?

RE: Does your DA50 do this?
 

Nope...The best setting for low idle will be very close to the best setting for transition, usually just a little lean..Every engine has a speed where the idle won't go any lower..Try for about 16 or 1800 rpm...This is what my procedure finds..You can set the speed a little faster if you want...At this speed the three little holes are working right, the idle mixture is not too rich...It doesn't take much more open on the low needle to get the transition right...
If you start out with the high needle too lean and set the low first, you're making the low needle compensate for the high being too lean, and it will be too rich..
1 1/2 is probaly close, most all Walbros are pretty good there, but not perfect, hence starting at 2....

RE: Does your DA50 do this?
 

Interesting ain't it .
The more simple the system -the more it tends to be over complicated .
Too bad there is not some method of relaying the right " sound" of an engine when the carb/ prop load and timing are all in harmony.
My old friend/partner in building kits, used to fret for hours over trying to find correct idle settins by moving needle a 32nd of a turn then letting it idle for five minutes .
Then yanking the carb open only to hear it strangle .
Drove me crazy-
There ain't no set of instructions which beat simply playing with the needles - from too much one way to too much the other .
I told a supposed "engineer" once that I learned from my mistakes - He said you can learn by others mistakes .
To put this in proper perspective, you can learn how to properly hold and bow a violin from others' teaching -but you can't learn to play it till you actually practice with it.

RE: Does your DA50 do this?
 

Dennis:
The serial number on one of the two is DA0410, DA411. My DA reciept is dated 7/7/2003.....

RE: Does your DA50 do this?
 

I was just curious. i have had 3 da 50's ranging in serial #'s from 1200" to 1850's and they all look like what is in the picture in the post on this page.

RE: Does your DA50 do this?
 

Ralph,

Thanks for the clarification. You are definitely right about the low compensating for the high if the high is too lean to start with. You can really change the transition point by tweaking the low and high a tad one way or the other. And the "ear" really needs to be trained for setting them right. Practice, practice, practice........:D

RE: Does your DA50 do this?
 

RCING1

Ralph

I have a DA50 that runs good but I have never set the needles (Afraid it might bite me) but I know their probably not right. I also know that you have explained it 1000 times but for my sake could you make it 1001.

Which one do you adjust first?
How do you know when the high speed is set right ?
How do you know when the low speed is right?
So fore and so on you get the idea.

By the way i'm running on my sixth gallon of 100 to 1 amsoil:D

RE: Does your DA50 do this?
 

Ive always adjusted glow engines while they were running..Does the same hold true for gassers? ..rear carbs of course..

RE: Does your DA50 do this?
 

The DA50’S reed valve, located between the crankcase and the carburetor, is housed in a black phenolic chamber. If fuel vapors condense in this phenolic chamber, gravity will collect them at the lowest point in the chamber, wherever that happens to be. If the engine is mounted inverted on the firewall, this low point will be at the top of the phenolic chamber just aft of the cylinder head. That is where DA is now mounting the pressure tap for the carburetor’s fuel pump. Now, the crankcase ‘s pressure oscillations not only work the fuel pump in the carburetor, they also stir up the vapors at this point in the phenolic chamber preventing fuel from pooling there.

The DA50R I got from Brian at DA last week has the pressure tap on the phenolc reed-valve housing. The engine does not exhibit any of the symptoms of the syndrome described by Brannon at the beginning of this thread. If your DA50 does exhibit the syndrome, call DA (1-520-772-0607) because they appear to be able to solve your problem. And their customer service is great.

RE: Does your DA50 do this?
 

so the picture in post 217 isnt a updated engine or is it?

RE: Does your DA50 do this?
 

Is this your motor? what is the serial #

RE: Does your DA50 do this?
 

yes it is mine and the # is DA 2528

RE: Does your DA50 do this?
 

Mine is #2758 and is identical to Bluemagic98's

RE: Does your DA50 do this?
 

I dont know if its a update or not i have had 3 da 50's with the lowest # being 1200. and it had the same set up. i think its best to call up dave or brian.

RE: Does your DA50 do this?
 

Well Since I had to wait for a month for mine I would think (hope) that it was the updated one

Any chance of seeing a pic of your DA Wayne??

RE: Does your DA50 do this?
 

Well here's a picture of mine and the serial # is 1635 same as everyone's.

RE: Does your DA50 do this?
 

Sorry guys got the number's mixed up

RE: Does your DA50 do this?
 

Redrum, Bodymann, & Bluemagic98:

The engines shown in posts 217 and 246 have the carburetor-pump pressure line connected to a nipple on the bottom of the crankcase (next to another hole that is available for a smoker pump that is plugged). Both holes are plugged in my engine, and a nipple has been screwed into a threaded hole in the top of the black phenolic chamber between the crankcase and the carburetor— close to the surface with the serial number. Incidentally, my engine’s serial number is 2837, so I presume that it is newer than yours. If your DA50s do not exhibit the full constellation of symptoms described by Joe Brannon in his initial post, then you don’t need the new nipple location. However, if you do have this problem, then call DA and arrange for them to add the new nipple. By the way, this has nothing to do with connecting rods or bearings.

I do not have a scanner or digital camera so I cannot post a picture of my engine. Sorry.

RE: Does your DA50 do this?
 

Thanks Wayne...Bummer..I was hoping I made the cut but I guess not..[:o]

RE: Does your DA50 do this?
 

If you had this trouble with your engine I wonder if they would send you the parts to make the changes yourself? Just a thought.
I for one think there are a whole lot of these motors out there that run just fine without the change's If i live long enough to get all the parts together im sure gone give it a shot

RE: Does your DA50 do this?
 

[quote]ORIGINAL: bluemagic98
If i live long enough to get all the parts together im sure gone give it a shot
[/quote/]

LOL..I know what you mean... took me almost 7 months to save up for everything..Im hoping to fire mine up this week...