"If you get it right... appx 3 min into the engine run the rpm will change SUDDENLY. Its practically always a reduced rpm due to the piston seating and... it goes richer. (needs the needle closed as much as 3/4 turn)"


Mr. Herman is my Dad. Today we ran the engine in on a test stand. I set the mixture to the point of four stroke and leaned it out until it started to two stroke. I went a few clicks lean from there. Just as FHHuber stated a few minutes into the run it slowed down. This made me a little nervous because I thought maybe it was starting to sieze. This was not the case. I had to lean it out slightly to get it back to previous rpm. After a tank of fuel we shut it down and sure enough it had loosened up.