Is anybody still viewing this thread? Is so, I have a inline 50cc that I need info on. I bought it here on RCU, and it didn't have instructions with it. I'm wondering what size prop to use. I've got plenty of experience with MOKI's, and really like them. But this is the first time I've owned a 50cc (the box says inline 350). I'm assuming that means 3.50 cubic inch.