ORIGINAL: warbird addict
The DLE engines are low compression engines and designed for (87 octane!!), personally I use a 22x10 prop and use a 50 to 1 oil mixed at 40 to 1 on 87 octane only, what I mean is every 2 stroke oil has a designed ratio (ie) 100 to 1/ 50 to 1 / 32 to 1 etc, make sure you're not taking an oil designed for a 100 to 1 ratio and mixing it at lets say 32 to 1 thats a no no, I'm a big fan of being a tad heavy on oil thats why I use an oil designed for a 50 to 1 mix and run a 40 to 1 mixture or a 100 to 1 oil mixed at 80 to 1.
Get to heavy of a mix on the oil and you will have a bear of a time getting it started as you will have had some low rpm engine time on it before shutdown the last time you used it which will have loaded up the base of the motor with oil that did not burn completely.
When you do get it started again does it puke out some black goo on the bottom of the plane after the first flight of the Day? if so what I'm saying might be worth investigating as I kinda had the same problem in that I tried some new synthetic oil and mixed it at 40 to 1 like usual, come to find out it was designed to be mixed at 100 to 1, we about wore out the needles figuring that one out.
The DLEmanual specifies 87-93 octane, and I'm staying within that envelope. I'm not aware that 2-cycle oil is actually engineered for a specific mix ratio (and most of the bottles I've picked up actually provide a list of how much gasoline to mix with the oil to attain multiple mixture ratios). It was my understanding that it is the equipment manufacturer that dictates the mix ratios, based on the amount of lubicity needed for a particular application. If this is incorrect, I'd love to read any information you might have on it (I'm always looking to learn as much as I can about our hobby!).
As far as whether I get black goo on the bottom of the plane after the first flight of the day: not that I have noticed. Of course, throughout the day, I'll get a light oily residue on surfaces downwind of the exhaust.