I just purchased my first gas engine, a VVRC 20 cc which I'm putting on a Four Star 120 build. The engine has good reviews, but the manual that came with the engine is very limited in information for a Newbee. The manual mentions to use a hard mount. I don't exactly know the reason for this, but I do want to run the engine on a test stand first for breaking in and my own education. Is it ok to run the engine hard mounted on a test stand, or should it have some shock absorbing mounting?

Lamar