The reason people say to "break down" the engine is because there could be small particals inside or flashing from the manufacturing process. I have never seen it, but it can happen.

I do take my engines apart and inspect them. I usually clean the parts and flush the engine block with denatured alcohol. I then use an air compressor to blow off the parts and dry them. I will then reassemble the engine using after run oil on all the internal parts.

Make sure all the screws are tighnetned up, particularlly the carburator pinch bolt and the back plate. I will use blue oxygen safe RVT sealant on the back plate and sometimes on the carbeurator if it doesn't have an o-ring.

Let the RVT setup over night and then fire it up.

Doug.