Goldenclan the engine is not running lean. The Ultimate 70 has an output bearing (the part that meets the rear of the spinner plate) that has a smooth surface with lightening holes drilled in it from the factory. It appears that this surface is too smooth. In the past, many years ago, when I had this problem with early 4 strokes, I glued 100 grit sandpaper on the front and back of a proper sized washer and placed it between the output bearing and the rear of the prop hub. That cured the problem. The OS 70 Ultimate is the latest 4 stroke technology. It just seems I shouldn't have to resort to this sort of rinkydink fix. I do have 2 prop nuts on the engine.

I want $80 bucks for the Funtana. When I made my first landing with it the landing gear collapsed and the wheel pants went all the way through the wing and punctured the top and bottom. I patched it with Scotch magic mending tape. It worked fine but patch sticks out like a sore thumb on the rite wing. Freight costs may not make it a good deal however. Local pickup may be the better way.

Northwing