ORIGINAL: thevirginian
All I can say is DON'T. Don't overload the motor before its broken in. Use a slightly smaller prop for break-in. A Vess 22B is perfect. Don't use synthetic oil to break in the motor, especially not mixed at 100:1. If you want to enjoy a powerful motor for a long time do what the experts do also. Use a quality, ashless petroleum based oil, such as Pennzoil for aircooled motors and a smaller prop. All moving parts need to wear in first before the motor can be "abused". Run at least two gallons of 32:1 mixture before switching to synthetic. Don't mix the synthetic less than 50:1, if you love your motor. If you don't then do what you think is better.
You can break in on synthetic and not compromise your engine, but I would never run any oil @ 100:1. I usually run Pennzoil air cooled at 32:1 for the life of the engine, or a synthetic at around 50;1.
If you don't push it hard on break-in, it doesn't really matter what prop you use. If you look at your rings you will find that they seat (break-in) much faster than people realize. That is if you have a decent and concentric cylinder, and believe me, I have seen some foreign cylinders that are less than perfect.
Ran Amsoil for a while, deposits were as hard as rock compared to many other oils, that is why I switched some time ago.