Wow.....I just found this thread and it's like you guys are all having the same issues with your SPE 26's that I was having. I just sent mine back to Cermark yesterday after about two months of hair-pulling, fist pounding, potty-mouth cussing at it all while failing miserably to get this thing running to even attempt a single flight. You have all described the exact symptoms I had with mine. I went through the carb several times, cleaned and re-gapped the plug, changed out fuel lines and endless needle tweaking to no avail. I finally said to hell with it and started putting on a Saito. I'll let you know how Cermark handles it. If they'll just credit me they can keep that engine, but if they make it work and send it back.....it's up for sale.