No. Don't run the engine on the field stand. It will in no way support the engine at full throttle.

Secure the plane using some sort of a tie-down that holds the plane in place on the ground or use a flight bench that has uprights that go in front of the wings. Then use something in the rear to hold the back end down (bungy cords loosly wrapped around but tight enough to hold the aircraft down...will work). As someone said, run it rich not lean, at full throttle for about 20 to 30 seconds then throttle down for about 10 seconds then back up at full and rich.. continue the cycle until you have burned about three tanks of fuel.

Flying it without breaking it in chances a dead stick at an inopportune time so its best to do it on the ground.

The above is simply a way of breaking the engine in. Sport Aviator on-line magazine has an article devoted to this and is well worth the read.

www.masportaviator.com