[sm=confused.gif]I have just bought(and almost built) a u-can-do .46. I bought a new O.S. 70 Surpass II for it. It calls for the engine to be mounted upsidedown. Some people say they have a problem with the tank being higher that the spraybar. This is a design flaw i guess. If you look at the o.s. engine, the carb is on the back upside down. The motor has NO fuel through it, should i break it in inverted on the plane?(....the manual says break in upright, so its a stupid question i guess) If i need to break it in upright, do i just flip my plane? I would like to break it in on the bench but have no idea how(well i have an idea...just not a useable one i guess).

Any help is better than no help,
THNX: Devin

Mount the engine on a board and fasten the board to something sturdy. Break your engine in upright.

Get your tank as low as you can.