coriolan

You can do the break-in on bench with an aircraft prop as load but since its a water cooled engine with no convection fins you'll need to provide water circulation. The ASP engines are ABC type and don't require a long break-in( a few bench runs should be enough to have everything fitting nicely). Some nitro (5/10%)makes idling better but not important,mixing a FAI blend (80%methanol-20% castor)would be fine too and at least you'd know exactly what is in your fuel!