ORIGINAL: Kema
Do you have noise regulations on your field or why are you running 13x8? Everyone have told me that YS63 is happiest when topping 11krpm with a prop. 13x8 sound more like a prop for Saito 82. I am using 13x6 APC on YS 63.
Almost everywhere you go in the NE US, there is noise restriction. But noise or no noise, this is a great prop for this engine. The engine runs extremely well set-up as I have it. I don't know why "everyone has told you" that this engine needs to turn 11k. Why would you want to run a 4 stroke that fast anyway? A 13x6 works well also but in my opinion not as well as the 13x8. The Saito just doesn't have the output of the small YS