Exactly, I’m convinced that I can’t just run it out of fuel and use after run oil to get rid of the nitro. I found that if I don't flush it with FAI fuel, a few days later there is a very subtle gritty feel to the bearings. I’m thinking that these are little rust spots on the balls and races from acids formed by leftover nitro residues.

Thats my story & I'm sticking to it