OLdtimer2. I think that everybody is busy either building or thinkering with their engines; you know is flying season and we need to take advantage of the weather as much as we can, but just to let you know I am now flying the same model the Excite 90 from Model Tech (bought one for $70.00 with a smashed wing rib) and using a WeedEater Featherlite Plus 25cc engine converted to Gasoline/E85/Nitro/Glow configuration and believe me I am having a ball with it, this thing has a lot of power and pulls that plane to unlimited vertical, the other engine that I had and was stolen with my plane/radio/field box didn't have the power I am getting out of this one.
So try this combination and I hope you can get the same satisfaction that I am getting, let me know your results.
As for the carb I am using regular walbro carb with the only modification done consisting of the enlargment of the venturi to .400 inches diameter
I tried the gasoline/E85/Acetone mixture I noticed that my engine was running hotter and eratic with missfires. so I stoped that combo and returned to my known and proven mixture.