OK Mr Motor, It must be a NEW old 50 because it is not ringed and it does not have clicks on the low end needle. I got it from a friend who quit flying and I don't know how long he had it. It still had the cosmoline on it in the box. No documents though. I also got a Webra Speed 120 that was brand new in the box but I sold it.
OK FuelMan, I run 10% in all of my other engines and I hate to run a different fuel in just one of my aircraft. I think I will try a colder plug. This may work because I started with an OS A3, changed to an OS A8 and it did seem to run better. What plug is colder than an A8?
OK Ed Cregger, I am flying the Webra in a ARF so I don't have a lot of expense in the model. I to don't like to give up on a challenge. I got half the guys in the Club and all of you good folks trying to help me also. Snowed this morning, good for skis, but the wind is up so won't be flying today.