Wish I had time to run up my engines. I have 4 that need to be run in, two new NGH 38CC 4 stroke gas, and two used YS engines that I have sitting around. I also have the Saito 91 in the new 4*60 that hasn't been run for years and was given to me. Should fire right up, but wont know until I get it on the stand. Really eager to hear how those 38CC engines sound with a stack. They are going in my B-25.