I would use the recomended Fuel by Saito for break in. I think its especially important to have the right amount of Oil. I am by no means an engine expert and am still on my first 4 stroke, but I think that half the engine problems people have are because they didnt break in the engine correctly.

I have to get a new UCD or fix mine so my membership to the thread doesnt get revoked.

Also I saw the posts about the glow plug starter, i just cut a big U out of the bottom of the cowl so there is nothing down there. Makes it easy to get to the glow plug, look up at the engine when I need too, gives more cooling, and goes on pretty easy that way.