Thanks I better check the cups then if its a known problem. My FG-60R3 flys pretty well so I haven't modified it yet. In temps 50F or under yes it takes probably 2 minutes to warm up before all cylinders start firing. I just installed all the Morris mods on my FG-19R3 because that piece of junk would take 4 minutes to warm up before the bottom cylinders would start firing. The mods made it easy to start and the throttle response is incredible compared to stock. Probably takes 30-45 seconds now to warm up before I can get to full RPM at about 60F. I'm sure its the same on the FG-60R3 from what you are saying.