Twinman,
as many G91's as you have maybe you can help me. I have one on my VF 66" Extra 300S. It runs great! The first start of the day needs alot of prime but from then on it will start with a flick of the finger. The problem is, it will idle down and run good for maybe a min. then it goes into a lower idle speed and depending on how fast the idle was set it may or may not continue to run. It is like it has a high speed idle and a low speed idle but you never know when it is going to go to the low idle. It makes for either a hot landing or a very scary low slow and dirty stall landing. I changed to a perry carb and even put a new Super Tigre carb on and it doesn't change. Running a 14x6 or 13x7 prop doesn't change it either. It only has about 3/4 gallon of fuel run so maybe it just needs broken in, I don't know. It is mounted sideways and am using PowerMaster 15% nitro 18% oil Any ideas?
Thanks