I would like to get some feed back from someone with A pumper or maybe A YS and see how it works for them. I only have one YS going at this time and it's perfect already so no reason to fool with it and my pumpers are down waiting on airplane repairs, that could take A while. Just wondering. It was daveopam that I got the tip from or I would have never thought of it at all, I have been doing it the same old way for years, nothing wrong with the way I was taught but this is just easier. So far I have only used it on A couple of OS two strokes and A couple of Saitos. Saito really sets there low ends fat for break in.