I have had two OS .91's, and on each of them I have a issue with them running lean on the top and rich in the middel. Is that a carb modification for this? And does any one know who make a ported cylinder for them.

I have now build a 42" span 78" length F 104 that weights 14 lbs. I am going to need all that I can get form engine to get it to fly well. Plus I have a f-8 that weights in at 15 lbs that just needs more power. Its a great flyer but it has zero vertical.

I know 99% of you will say go with a turbine or edf. But I dont want too. I love two stroke engines and goo.

I also know that are alot of guys here that know alot more about df than I do from years ago, so if you can try to remember a few tricks form 15 years ago I would be a great help.

Thanks

Josh