DA 100 running on one cyl

[KaptanKaos]

Hello

I have a DA100. Last year I replaced an ignition that was bad on one side. Had about 5 -6 flights and now it runs on only 1 cylinder again. This only happens around midrange. If I go to full, the second cylinder kicks in again. Is it possible the ignition is bad again? I pulled the plugs (they are also new) and the left cylinder is wet whereas the right is dry. I tried adjusting the mixtures but it did not help.

Is there a common problem with the ignitons?

Should I send the whole engine back for check up?

When I look thorugh the exhaust port, you can see the right piston has more evidence of running where the left looks a lot cleaner as if it does not fire very often.

[Vic3D]

What battery are you running on the ignition, and do you have a reg?

[3ddd]

change sides with the caps and see if the miss follows the plug lead.if it does then the ignition is probably bad i would put a new set of plugs in also new don't always mean good.it could just be the resistor in the plug cap but changing sides will help determine this.mixture settings won't usually cause the plug to miss intermittently

[KaptanKaos]

	Quote: Originally Posted by Vic3D
	What battery are you running on the ignition, and do you have a reg?

5 cell NIMH 2700.

I guess I am just frustrated with this engine. After having to replace the ignition (tested at DA and determined it was bad) and still having similar issues I get tired of it.

I switched the leads over today and ran it. It still seemed to miss about mid throtle but I could not tell if it was the same cylinder or not. Although when I pulled the plugs, the left side was wet (not firing).

Could it be something in the engine itself?

It looks like the right cyclinder has been working fine by the amount of carbon near the exaust port. The left side looks a lot cleaner. Even on the side of the piston the left one looks cleaner than the right.

[KaptanKaos]

I had a spare ignition so I put it on. I also talked with Jeff at DA and he walked me though a proper carb set up. I set it up like he described and it appears to be better. I have not had it in the air yet, but on the gorund, it seems fine. Once I fly it, if everything is good, I will put the first ignition back on to see what happens. On the bench the ignition seems to be OK. It could be just the way I was setiing up the mixtures.

[rdgood]

Dude!

Went thru the same thing with my DA-150 its the carb!!! replace IT NOW - it will only get worse. DA will say it's not!! Trust me on this one - I lost a plane because of it!!!!

One more thing are having to really lean out the low end to get things to run right??? If you are replace the carb NOW!! This problem will not go away!! it just gets worse with time and you will drive yourself nutz - DA will say its not the carb..

I finally spent the 100 bucks and I couldn't believe it...

Yes its sublte thing - Yes it will run but it acts weird in the air... but one thing you will notice is that evrybody elses DA-100 will run smoother/better than yours at idle.

Ronster

[Neogenesis]

edited...........I had posted some mis-information.....removed for that reason.


Neo

[hawk21]

DA ignitions can handle a 5 cell nicad or nimh without regulator

[KaptanKaos]

	Quote: Originally Posted by Neogenesis
	Here is your first problem....DA ignitions are only rated for 4.8 volts. Neo

Says 4.8 - 6.0 Ni-cad right on the side of the ignition.

[Neogenesis]

Then I retract my statement..........sry for the misinformation. Now that I think back on it....I was thinking of Lipo/Lithium ready. I'll edit my original post as to not confuse others.


Neo

[rdgood]

Straight from Da - 5.5 volts is optimum for the DA- ignition module.

Ronster

[rdgood]

Kaptankaos,

I think that DA's have a tendancy to have one jug run a little richer than the other.

Does your engine run any better since you retuned it??

This is a carbon copy of the problem I had with my DA-150. The left jug would run rich and cut out and then I would lean down the low end until it would clear out.

I sent it back to DA several times. First time I had them replace the ignition module - same same behavior.

Now bare in mind it will run - just not real smooth and the transition is less than stellar. I flew it like that for some 2 years - but I constantly had to screw with the low end throttle needle always to lean side... Its the kind of thing where you know it will run but it just doesn't sound happy at idle range. About 6 weeks ago it finally got me - the engine quit on me in a harrier about 20 feet up - Sent the engine to have it checked out - I said that's it - I want a another new ignition and a new carb. Took it out this weekend and a minor tweak on the low end to rich side and it behaves so nice now. I wish I some one would have told to just get a new carb.

Ever since I owned this engine it never did behave like everyone elses. When I first got the motor the left jug would not fire up until ya get past 3/8's to 1/2 throttle.
I would have to lean out the low end like mad to get it to behave.

I suspect - I say suspect - that this may have something to do with the pop off psi adjustment of the carb.. I don't know if DA will do this kind of adjustment with the carbs or not?? Of course I could be all wet on the pop off issue - I am no carb guru far from it!! I know enough to be dangerous....

I spent the last 3 years or so fighting this problem... God I just don't want to see someone else go through this crap like I did!!!!

Ronster