I've owned 2 of them, just do it like any other engine. It's a good basher motor and you'll enjoy it.

I run them like normal for about 3-4 minutes at a time, then let cool 10-15 minutes with piston at BDC (bottom dead center, not in contact with sleeve). I do that about 5-6 times and that's the extent of my break-in. Haven't had any break-in related problems with my motors yet, all run like champs.

Also, when new it doesn't hurt to warm up the engine with a heat gun or hair dryer prior to starting. A warmer engine has a looser pinch and that makes it easier to start IMO.