DLE 30 Engine Missing
 

I bought a new DLE 30 about 60 days ago and have ran about 2 gallons of fuel thru it in the air and I cannot not get the miss or burble out of it at about 4000 rpm's. Idle to 3500 rpm's if fine and top end is great, but mid range studders and burbles in the air. I have tried leaning the needles to the point where there is no transition and then opened 1/16 more and it transitions well. My best needle combo's are 1-3/8 turns Low and 1-5/8 turns High. The engine was ran on 2 tanks of lawn boy @ 32:1 and the went to Bel Ray Hr-1 @ 50:1 with 87 octane gas. This last mixtures still slings alot of fuel/oil residue on bottom of fuse and horizonal stab, just as it did with lawn boy oil and richer needle settings for the first 2 tanks, but not quite as much. I am running a Zoar 18 x 10 prop, NGK CM-6 plug (since New and changed plug after switching oil type and now the porcelan color is cocoa with oil residue inside) on an open (no cowl) Road Runner (high wing)weighing in at about 13 pounds. Also the motor has quit several times upon landing, right after the gear touches down with a little bounce. I am leaning towards a carb problem with the tillison carb, but that is just a quess and I am looking for some professional advice, short of returning the motor for service, which was purchased in the USA thru Valley Veiw. Thanks Bob

RE: DLE 30 Engine Missing
 

Your low end sounds rich. Most are ending up around 7/8 to 1 1/8 on the low. As for quitting on landing check out this thread.
http://www.rcuniverse.com/forum/m_94..._1/key_/tm.htm

RE: DLE 30 Engine Missing
 

Im sorry your engines missing bob, maybe you just misplaced it.

RE: DLE 30 Engine Missing
 

The DL30s some have a tilt stop running problem apon landing...
It is caused by the reed valves collecting oil...
Friend of mine`s stoped when landing at least 30to40 times that I saw...
OTHER THAN THAT it runs GREAT !!!!

Tom and Jody and DLE know about this and will have a fix soon...
Walt

RE: DLE 30 Engine Missing
 

Your low needle is to rich and your high needle is to lean. Start over at 1-1/8 turn on the low and 2 turns on the high, adjust the high needle first for peak RPM then the low for the leanest transition possible. Correctly adjusted it will not accept throttle when cold, it will have to warm up for about 30-40 seconds first. It's impossible to get every bit of burble out of most gas engines but it should be able to be adjusted so it's clean from 1/4 to1/3 throttle on up.

RE: DLE 30 Engine Missing
 

The balancing act between low and high needle seems to be the most difficult thing about gas engines with floatless carbs.
There is a simple rule about this.
If the engine is easy to start, the low probably still is too rich. Lean out the low until starting without choke in a warm engine becomes impossible. That is the "too-lean" setting. From there, open up, but no more than 1/4 turn.

Other method according to Walbro instructions:
At slightly high idle (about 1800 rpm), find the L-needle setting with best rpm, by finding the lean rpm drop and the rich rpm drop. Best setting is in between.
Then set the high needle for best rpm. Find the rich rpm drop of the high needle. Stay just clear of that rpm drop.

Now a cold engine should not accept throttle until well warmed up. Once warm, throttle response should be crisp. If not, richen the L-needle slightly. This will improve the hot starting, and also add to the idle shake. This is normal, and just the thing that two stroke gas engines do.

P.S.
fine tuning the L-needle should not be done hamfisted. Turning the screw a hair makes a difference. Using 1/4 turns, or even 1/8th turns will probably overshoot the ideal setting. In some carbs with steep idle needle taper, 1/16th of a turn is too much.

RE: DLE 30 Engine Missing
 

PE
Very good description on how to set the carb needles on a 2 stroke engine. Good to read your words of wisdom. Capt,n

RE: DLE 30 Engine Missing
 

That was so well written I copied it and sent it to a couple of friends that are new to gas, it should help them allot.

RE: DLE 30 Engine Missing
 

Nice job Pe! [8D]

RE: DLE 30 Engine Missing
 

Thanks for all the help and fast response time. I will try the new needle settings and report back how it turns out. Thanks Bob

RE: DLE 30 Engine Missing
 

thks for the chapeau guys.

RE: DLE 30 Engine Missing
 

Hi, I took the plane to the field today and applied my new found knowledge on setting a fussy carb and I made a 75% improvement from my last writing, The biggest being the oil on the airframe. The burble/studder got 50% better on the stand, but it was too windy to fly,therefore i cannot comment on how it sounds in the air. PE was right about making very small corrections on the low end from the no transition point to a setting that transition will be smooth. With a warm engine it now took 2 or 3 flips before it would restart. The idle ran at 1860 to 1980 rpm's and transitioned well. with the 18 x 10 zoar prop, the engine would hold 7000 rpm's. Now comes the downside, I put the plane on the ground and the first time i tilted it, it quit. I richened the low a tiny amount and that helped, but running it down the runway, I would give it 30% throttle and as soon as the wheels lifted, I cut the throttle and 1/3 of the runs the engine quit. Does this mean when I land that it will quit after I landed 1/3 rd of the time and what should I do to fix this? Does this apply to the above comment about the problem that others are having or is it just me. There seems like there is not much for room for adjustment without making it so rich that it makes a mess on the plane, as per my first problem. I await my next instructions on what to do next. Thanks Bob

RE: DLE 30 Engine Missing
 

engine quitting on tilting is a fuel puddling problem. (design flaw), that cannot be tuned out by carb tuning.
Contact your dealer for an update.

RE: DLE 30 Engine Missing
 

Thanks pe and that is what I will do.

RE: DLE 30 Engine Missing
 

Does anyone really think there will be a fix other than the fine, rear carb modification made by someone else

RE: DLE 30 Engine Missing
 

Nope. People who have the engine are either living with the problem or buying the aftermarket back plate. Thus DLE has no reason to fix their mistake.

RE: DLE 30 Engine Missing
 

Why wouldnt they fix it? Ive got three of them. According to Jodi, some thing is in the works. Supposedly

RE: DLE 30 Engine Missing
 

Just for the record, I don't want to lead people on but what I've said is that the factory's attitude toward the tilt and die issue has changed from complete dismissal of the issue to a posture of consideration that it's important to their customers and they are looking at it. If, what, and when is an unknown at this time. That said, anyone that has followed DLE over the years knows they are THE Chinese engine manufacturer and have steadily improved their products continuously to the point now that they are as good as almost anything money can buy, I can see no reason for this to change.</p>

RE: DLE 30 Engine Missing
 

:D

RE: DLE 30 Engine Missing
 

Put a few gallons of gas through it and the dieing on landing will probably stop. The tilting more than likely will not, but if you tilt your plane when landing you're gonna need a new plane:)
I had the dieing on idle problem with my 30. After disassembling it I found it to be on the tight side because the piston skirts had been excessively rubbing in the cylinder. I took some 600 wet/dry and took a little off of the spots where the skirt was rubbing and that solved the dieing on landing problem. When warmed up the poor engine could not over come internal friction when the idle was set sufficiently low. To date the engine still idles a little lower once warmed up, guess I didn't take off quite enough:) Few more gallons should cure that.