ys start up after sitting
Yes I own several (4) YS 45'S one YS 60 and a YS 53 and have been flying them since the early 80's - after reading about a pretty extensive test of different products to be used as After Run oil the best results as far as maintaining rust free internals, and in the case of YS engines keeping the diaphram soft and pliable ATF scored the highest in the tests. I think maybe the formula may have changed some over the years but the result as far as I can see are the same. Rust Free engines and I am still flying my engines with the same diaphrams (one exception due to losing one). I use Power Master 20/20 fuel. I have a lot of regard for the YS engines and I bought extra pistons, cylinders and bearings to use about 1990 but never needed them .